Dec 142017
Z80 CP/M Emulator, runs with or without NEC V-series chips. Shareware.
File Z80MU52A.ZIP from The Programmer’s Corner in
Category Miscellaneous Language Source Code
Z80 CP/M Emulator, runs with or without NEC V-series chips. Shareware.
File Name File Size Zip Size Zip Type
AUTOEXEC.Z80 315 198 deflated
DDT.SYM 589 324 deflated
README.1ST 35576 12495 deflated
SETTINGS.COM 1152 500 deflated
TEST.COM 4736 2147 deflated
TEST.SYM 6516 1737 deflated
Z80MU.EXE 113652 59326 deflated
Z80MUDMP.COM 1400 930 deflated
ZCONVERT.EXE 8948 5493 deflated

Download File Z80MU52A.ZIP Here

Contents of the README.1ST file

Joan Riff's "Z80MU PROFESSIONAL" Z80 and CP/M 2.2 Emulator

Copyright (C) 1989 Computerwise Consulting Services
P.O. Box 813
McLean, VA 22101
(703) 450-7175

IMPORTANT NOTICE! Please read and understand the following...

This is a fully-functional version of Joan Riff's "Z80MU PROFESSIONAL" Z80
and CP/M 2.2 Emulator, which allows you to run most CP/M 2.2 and/or Z80
software on the IBM PC. This is not "crippleware". No functions have been
disabled. This is the complete product, an exact image of the same
emulator that we use here at CCS to produce Z80 controller software on the

However, we *ARE NOT* giving it away. We have placed many packages into
the public domain in the last five years, but this is not one of them.

This package is being distributed as "shareware", which translates roughly
into "Try it *BEFORE* you buy it". This does not mean "Use it, don't pay
for it, and don't tell anybody". We are the owners of the copyright for
this software and all associated files and documentation. As the owners,
we are free to specify how the package may be distributed, who may use it,
and under what conditions it may be used. Under federal copyright
statutes, our word in this matter is law. So please pay attention.


This package may be transferred by you to others, but *ONLY* if you
distribute the original ZIP-format file, and *ONLY* if what you distribute
is unchanged. It may be posted to Bulletin Board Systems (BBSs), and may
reside there indefinitely in its original ZIP format for others to find
and download.


This package may be used by any individual who abides by the restrictions
which we place upon the package, which means in summary that - except for


You have our permission to unpack the ZIP file, examine the files
contained therein, and briefly evaluate the package. Once the ZIP file is
unpacked, the components thereof may not be distributed to others in any
form. Remember - only the original ZIP file may be distributed.

By "briefly evaluate" we mean that you may try out the package for up to
14 days, in order to decide whether or not it's right for you. If you have
CP/M software which you want to run on the PC, then 14 days is ample time
for you to move that software to the PC, run it under Z80MU PROFESSIONAL,
and see whether or not Z80MU PROFESSIONAL will do what you need done.

If you don't think that this package is worth the registration price, then
don't use it. Period. Not even to run the CP/M assembler ASM.COM, or to
disassemble a Z80 ROM, or to run the CP/M version of WORDSTAR. Such use
violates our copyright.

If you like the package, then buy it. Period. With "shareware", you buy it
by registering with us.


The fee for registration is $150 per user of the package (not per system).

Send your name, address, telephone number, and the registration fee to:

Z80MU Registration
Computerwise Consulting Services
P.O. Box 813
McLean, VA 22101

This registration process notifies us that there is one more user of the
package to be supported by us. We want to be sure that you are properly
supported. So when we receive your registration fee, we send you:

1) A disk with the latest version of the software on it. Sad
to say, there are folks who introduce viruses (and other
bugs) into packages that they find on BBSs, and then send the
corrupted versions on to other BBSs. We discovered this with
our public domain versions of Z80MU, DIAGS, and others, which
is the primary reason that we no longer place software into the
public domain. So when you register, you get a copy of the
package straight from us, which is guaranteed to be a "virgin"
copy, and to be the very latest version of the software.

2) A printed manual. You really can't get the most out of this
software until you read the manual. Sure we've made the
program easy to use. But there's no substitute for being
able to curl up with a good manual when you want to become
really smart about a product.

3) A single-user license, which gives you legal permission to

You also get entered into our database of supported users. When you call
as a registered user of our software, then you have our undivided
attention. Period. Our expensive telephone answering and routing system
exists solely to support *YOU*, the user who keeps us in business.

Lastly, by paying the registration fee you obtain our permission to use
this software. If you don't pay the fee, you don't get our permission:
this will not make your boss very happy (if you use this software at
work), since his company is legally liable in federal court for copyright

Sure, you *COULD* keep the software for your own use without registering
it - thus violating our copyright - and try to hide it from everybody. But
what would you have gained? It must be a neat program, or else you would
not want to use it at all (let alone illegally). So you've got access to
the world's best operating system emulator, AND YOU CAN'T TELL ANYBODY!
What's more, by your own admission (because you use it) we must have done
a good job in writing the software. But you won't give us credit? Sorry,
but we just can't imagine even a Software Scrooge being quite that sick in
the spirit...

BBS SYSOPS NOTE: If you make the original ZIP file of this package
available on your system for others to download, then we might register
you WITHOUT CHARGE. Just follow the registration process, but instead of
including a registration fee include the phone number of your BBS, and a
userid and password for Joan Riff to use to dial in to your system. When
we dial in and verify the presence of the original ZIP file on your
system, then we will send you a license to use this package - with our
compliments! Unfortunately, this offer must be limited to the first 100

Background: Why Z80MU PROFESSIONAL?

We are the folks who created Z80MU version 3.10, which was placed in the
public domain in 1986, and was featured in the October 1986 issue of BYTE
magazine as one of seven "Public Domain Powerhouses of 1986".

According to our estimates (which are admittedly contestable due to the
impossibility of accurately tracking public domain distribution), that
version of Z80MU has rapidly become the most widely-used CP/M and Z80
emulator of any type (public domain, shareware, or commercial) in the
world, due mainly to the uncanny accuracy of Z80MU's emulation of CP/M and
of the Z80 chip.

Since 1986, we have completely rewritten Z80MU 3.10 in order to produce
Z80MU PROFESSIONAL. This new package greatly increases the productivity of
folks (like us) who deal with Z80 object code all day long, and - believe
it or not - emulates CP/M much more accurately than even that reliable old
workhorse Z80MU 3.10 did. Unlike Z80MU 3.10, Z80MU PROFESSIONAL is not
being placed into the public domain. It is sold as a commercial product.

Yes, it's nice that out of the goodness of our hearts we placed Z80MU 3.10
in the public domain. And we're truly happy that so many folks have said
flattering things about Z80MU 3.10. But there are aspects to public domain
distribution which we overlooked back in 1986:

1) CORRUPTION: There are many copies of Z80MU 3.10 floating
around various bulletin boards - and even being sold by
so-called Public Domain software houses - which have been
corrupted so that the 100-page manual or the executable
file are not the same that they were when we released
them. Some of this corruption seems to be inadvertant.
Some seems to be deliberate. But since there are so many
copies out there, we have lost all control over the
package. When we come across a bad copy, we try to destroy
it and replace it with a good copy. But we can't possibly
track them all down, due to the nature of public domain
distribution. And keeping long-distance bulletin boards up
to date leads straight into...

2) WE LOST OUR SHIRTS: In theory, you place something in the
public domain as a favor. People ought not to expect
constant support for a public domain product. Just because
we're decent folks and can emphasize with the poor end
user, we have provided many long hours of support to users
of Z80MU 3.10 at no charge. But this costs us. And every
time that Computer Shopper or some other irresponsible
publication reviews Z80MU 3.10 and says (without our
permission) something like "CCS will send you a copy of
this excellent program for FREE", we are inundated with
calls and letters from readers who want as much as they
can get for free. Due to the sheer volume of incoming
requests, many must go unanswered. Some readers get irate,
like the [few] who have said "I paid $3 for Z80MU from
Such-and-Such Software, and I expect support, buddy!", and
the one Good American who demanded "If you weren't gonna
support the thing, why the h___ did you put it in the
public domain!?" We lose because of the ill will created
by such encounters. We lose because the manhours spent
supporting users of Z80MU 3.10 are manhours that we aren't
getting paid for.

So we're still paying for that perhaps ill-advised but well-meaning
decision back in 1986 to release Z80MU 3.10 to the public domain.

We may learn slow, but we learn well. So we are offering Z80MU
PROFESSIONAL for sale. We *WILL NOT* release it to the public domain. But
we *WILL* support each and every purchaser, and we *WILL* guarantee that
any copy which you get direct from us is free of corruption and viruses.

Files on the Z80MU PROFESSIONAL Distribution Disk

Filename Size Date

AUTOEXEC.Z80 315 2 Feb 1989
DDT.SYM 589 19 Sep 1988
SETTINGS.COM 1152 14 Jan 1989
TEST.COM 4736 20 Aug 1989
TEST.SYM 6516 20 Aug 1989
Z80MU.EXE 113652 22 Aug 1989
Z80MUDMP.COM 1400 23 Sep 1988
ZCONVERT.EXE 8948 21 Feb 1989

AUTOEXEC.Z80This is a sample AUTOEXEC.Z80 file. If such a file is
present in the current directory when the Emulator begins
execution, then the Emulator will automatically read and
execute all commands which are present on this file. Feel
free to change this file to suit your own preferences, or
to delete it entirely.

DDT.SYMChapter 7 of the Z80 PROFESSIONAL manual describes the
operation of the Disassembler. At the end of the
chapter (see page 7-8) is an example which applies a
Symbol Table to Digital Research's DDT.COM program.
This file is the Symbol Table which is shown in the
text. We have included it here so that you don't have
to type it in from the sample shown in the manual.
Just read this file into the Emulator via "SUBMIT
DDT.SYM" where the text says to enter "the list of
commands shown above".

SETTINGS.COMThis is a CP/M program which displays some of the current
Emulator settings. You should copy this file to whatever
directory holds your CP/M utility programs, as defined by
the "CPMPATH" environment variable.

Don't try running this file directly from DOS! It must be
run under the Emulator!

TEST.COMThis is a sample CP/M program which simply demonstrates
that the Emulator does, in fact, run CP/M software.
In addition, this one automatically sets H19 terminal
emulation mode, and recognizes PC extended

Don't try running this file directly from DOS! It must be
run under the Emulator!

TEST.SYMThis is the Symbol Table file for TEST.COM. This file is
useful if you're interested in learning about Z80MU's
RESOURCE facility. The symbols in this file can turn
a disassembly of the object code in TEST.COM into
something very close to the original source code.

To demonstrate this, issue the following Z80MU

dissam 100Note: This disassembly
will show little more
than raw opcodes, because
Z80MU has no symbol
information to work with.

submit test.symNote: This reads in the
symbol information.

dissam 100Note: This time, the
disassembly contains
enough symbol information
to produce original source

Z80MU.EXEThis is the Emulator itself. Copy this file to one of the
hard disk directories specified by your "PATH" environment
variable, so that it is available at the DOS prompt no
matter where you are on your hard disk.

Z80MUDMP.COMThis is a DOS program which handles the printing of the
screen to the printer. It replaces the standard IBM
PC ROM BIOS print screen routine.

Many of the Emulator screens contain PC graphic
characters. When the IBM PC ROM BIOS print-screen
routine prints these characters, it sends odd escape
codes to the printer which may thoroughly confuse it.

This program - Z80MUDMP.COM - knows how to translate
these odd characters into the proper codes for the
printer. This yields accurate screen dumps without
producing garbage on the printer.

This program may be used with or without the
Emulator. It is a stand-alone utility which should be
invoked when your system first boots up, so you
should copy this file to a hard disk directory which
is available at system boot time (we recommend that
you copy it to the root directory of drive C:).

When the program is invoked, it accepts one
command-line parameter. This tells the program
whether your printer can handle IBM PC graphic

Z80MUDMP Iinstalls the program, and tells it
to use the IBM PC character set.

Z80MUDMP Ainstalls the program, and tells it
to use the ASCII character set. PC
graphic characters which are on the
screen will be translated into near
ASCII equivalents.

ZCONVERT.EXEThis is a DOS program which converts an old-style symbol
table control file as created by version 3.10 of
Z80MU into a new-style symbol table which may be used
as a submit file with Z80MU PROFESSIONAL. The
old-style control file is read from standard input,
and the new-style table is written to standard
output, so the proper way to use this program is by
typing the following at the DOS prompt:

zconvert newfile

[Note: Substitute your own filenames for "oldfile"
and "newfile" in the above example.]

You may then input the new file into Z80MU PROFESSIONAL
via the Z80MU command:

SUBMIT newfile

The conversion isn't perfect, due to differing limits
imposed by the two versions of Z80MU. Labels may be
truncated, and so on. Just load the new file into
Z80MU PROFESSIONAL and clean it up with the
full-screen disassembler.


The "shareware" version of Z80MU PROFESSIONAL does not include any sort of
manual. When you register your copy, you will receive a manual. In the
meantime, the following should be sufficient to get you up and running:

1) To install Z80MU, simply copy all of the distribution files
into one directory on your hard disk (or to a work floppy).
Likewise, copy to the same directory any of your CP/M programs
which you will want to run.

2) You start Z80MU running just by typing in "Z80MU" at the DOS
prompt. Once Z80MU begins execution, it displays its copyright
screen. Press {Return} to acknowledge that you have read the

For all intents and purposes, you are now running CP/M on your

3) Z80MU PROFESSIONAL (like all of our products) contains
extensive online documentation. At Z80MU's CP/M prompt, just
type "HELP". You will be presented with screen after screen of
help, with one screen for each and every command which is
processed by Z80MU. You may page through these HELP screens
with the {PgUp} and {PgDn} keys. For more details on the use of
HELP, type "HELP HELP" at Z80MU's prompt.

4) You quit Z80MU by typing "QUIT" at Z80MU's prompt. This brings
you back to DOS.

Changes for Z80MU PROFESSIONAL version 5.2a

1) Distribution was changed from advertising to the "shareware"
concept. No changes were made to the source code. The DEMO
version of Z80MU PROFESSIONAL is now outdated.

Changes for Z80MU PROFESSIONAL version 5.2

1) The video routines were tweaked to provide faster support for
CGA's, because CGA support was brutally sacrified at the altar
of blinding performance for everybody else. Now it's reasonable.

2) The handling of direct port I/O (via SET_IOBASE) has changed
slightly. When the Z80 CPU emulator encounters a Z80 IN or
OUT instruction, the logic is now as follows:

a) Add the 8-bit Z80 I/O address to the current I/O
BASE as set by the last SET_IOBASE command, thus
yielding a 16-bit PC I/O address.

b) Handle the operation according to the resulting
16-bit PC I/O address:

FF00 - FFFF:No I/O is performed, although
any auto-increment etc is
accomplished. Only the actual
I/O is ignored. But the program
continues to run. So if you want
to run a Z80 program which you
know does direct I/O but which
you don't want to have aborted,
use "SET_IOBASE FF00".

0400 - EFFF:The program is aborted. So if you
want to trap any programs which you
suspect might do direct I/O, use

0000 - 03FF:The I/O is performed to the resulting
16-bit PC I/O address.

3) A "PATCH" command has been added, for those times when you just
have to patch CP/M memory from a SUBMIT file.

4) A "GO" command has been added to continue execution of an
interrupted program, for those times when you just don't
want to have to get into the debugger just to issue an
{Alt-G} (for "Go") command. If you've started a program,
for example, and discovered that the program requires a
different terminal type, then just interrupt the program
with ^BREAK, issue the right "SET_TERM" command, and then
use this new "GO" command to resume execution where it
left off.

5) The labels generated by the "SYMGEN" command have been changed
slightly. Instead of being "AUTO99999" (where 99999 starts at
zero and increments with each generated label), they are
formatted as "AUTO_xxxx", where "xxxx" is the address of the
label. This makes it easier during the analysis phase to see
just what an auto-generated label refers to. Our apologies to
those who will submit the generated source to an assembler which
does not allow the underscore character in labels. All things
considered, we thought that this method was the best for all
concerned. Just use your editor to change the "_" characters
to something else if you must...

6) RST 7 instructions are no longer used for breakpoints. Instead,
we have gone back to the version 3.10 method of using HALT
opcodes for the breakpoints. This allows you to use the
debugger to trap code which isn't for CP/M (such as ROM-based
disk controller code), or to set breakpoints in CP/M debuggers
like DDT which use the RST 7 for their own use. One side effect
of this is that you will be using the emulated Z80 CPU as long as
you are in the debugger - even if the 8080 CPU (using the
NEC V20 chip) had been in effect when you entered the debugger.
So if you issue the "Go" command via {Alt-G} in the debugger,
the program will be executed as Z80 opcodes, via the software
Z80 emulator. When you exit the debugger, you will be switched
back to the proper emulated CPU.

Note, however, that RST instructions *ARE* still used for various
CP/M-related operations like BIOS and BDOS calls. Since such
calls only make sense in a CP/M application, this should be
no problem.

7) Under certain circumstances the Z80MU prompt would appear
farther up the screen than it should. This occurred whenever
you sent output to the CON device (i.e. = "SYMLIST" without
a filename, or "RESOURCE 100 1ff CON"). This has been fixed.

Changes for Z80MU PROFESSIONAL version 5.1

NOTE: A new manual was produced for version 5.1, so changes
listed for version 5.1 or for prior versions are reflected in
the manual. Changes for later versions are not in the manual.
Any information here which conflicts with information in the
manual takes precedence over the information in the manual.

1) The SET_MASK command has been added to allow masking of
output characters to 7 bits.

2) Various commands (CD, CHDIR, MD, MKDIR, RD, RMDIR, CLS) which
used to be passed to DOS and handled by COMMAND.COM are now
handled internally by the Emulator. This speeds up the processing
of these much-used commands.

3) The video support routines have been rewritten. Speed with EGA
and VGA displays has been improved, but CGA displays which need
to have snow eliminated by software will be a little slower than

4) The printed Step output obtained by {Alt-L} in DEBUG has been
reformatted for easier scanning of voluminous output. In addition,
any disassembled line with a PC value of 0005 has an asterisk
at the left edge, to enable you to locate BDOS calls quickly.

5) The "WRITE" command used to generate a bad checksum on the last
line of a HEX file in certain circumstances. This has been fixed.

6) Single-step mode used to execute two instructions upon return
from a BIOS or BDOS call. This has been fixed so that it
properly stops between instructions.

7) You may enter an Emulator command when you invoke Z80MU. When used
like this, the Emulator will process this single command and then
automatically exit back to DOS.

8) DOS reports that there are at least 5 drives on the system, even
if you have fewer than 5. So Z80MU determines the number of drives
by itself. This is more accurate.

9) Some confusion has resulted from the "Select Drive" BDOS emulation.
At each Emulator prompt, the drive is reset to whichever drive
was active before a CP/M program was run. During CP/M operation,
drive select requests will be honored. So far, this is just the same
as you had with CP/M. The confusion occurs when you interrupt a
CP/M program with ^BREAK (which you never could do with a true
CP/M system). The Emulator interrupts the CP/M program, then gives
you its prompt. As part of this prompt, it switches back to the
"right" default drive (just as the original DRI CCP used to do).
If you then enter the debugger and continue the program, you will
still be using the Emulator prompt's drive. This MAY OR MAY NOT be
the drive which your CP/M program last selected. This MAY OR MAY
NOT be the drive that you want to be the default one as you
continue the CP/M program.

10) The CP/M BDOS emulation has been improved (again!).

Changes for Z80MU PROFESSIONAL version 5.0

NOTE: This list details the most significant differences between
the last public domain version - Z80MU 3.10 (the one featured
in the October 1986 issue of BYTE magazine) - and the first
version of the Z80MU PROFESSIONAL series (version 5.0). This
list is by no means complete, because Z80MU PROFESSIONAL was a
complete rewrite of the source code. There are innumerable
differences not listed here which *WILL* make a difference in
operation. Nevertheless, we feel that it is important to show
some of the differences, so that owners of the public domain
version (Z80MU 3.10) will know what the PROFESSIONAL version
offers over the public domain version.

NOTE: We will not disclose details here. We made that mistake
when we wrote the definitive article on Z80 and CP/M emulation
which appeared in the October 1986 issue of BYTE magazine. Soon
after that article appeared, other emulators began incorporating
our copyrighted code without our permission. Rather than
litigate, we'll obtain justice by keeping Z80MU far and away
the fastest and most accurate emulator of the Z80 and of CP/M
for the IBM PC - and we *WON'T* tell them how we're doing it!

1) The user interface is interactive and lightning fast. We no
longer use the very slow DOS input and output routines. On the
negative side, this means that you can no longer use DOS I/O
redirection when the program is run. On the positive side,
this means that screen output is very fast, you have control
over the colors used, and in general we can provide a much
more productive environment.

2) You can recall and edit previous commands.

3) Interactive, full-screen help, disassembly, and debugging. This
alone made the switch from DOS I/O worth it. You haven't lived
until you have seen how fast and easy it is to create source
code from object code using the disassembler, which includes:

a) Full-screen, instant updates. Whenever you tell the
Emulator something about the object code, the result
appears instantly on the screen. In effect, you are
looking at a living disassembly of the object code.

b) Support for Z80 or 8080 mnemonics.

And the full-screen debugger is likewise a joy to use:

a) All Z80 registers (including the Stack) are always
on the screen, and the first dozen or so source
statements at the current PC are always accurately
disassembled and on-screen.

b) To change any register, you just move the cursor
to that register's on-screen value and type in the
new value.

c) You may have up to 8 unconditional breakpoints active
at once, and each can contain a pass count. When any
of the 8 breakpoints are reached, execution stops and
the debug screen instantly appears.

d) You may also specify a Conditional Break, such as
"Break when the PC is greater than F600", or "Break
when the PC equals 0005 and the C register holds 1A".

e) BDOS and PC History tracebacks have been carried forward
from version 3.10. In addition, you can have instructions
disassembled to the printer (with or without the current
register values) as they are executed, and limit this
activity to a range of CP/M addresses. This is just the
thing for those tricky bugs which are hard to catch,
when what you really need is a boxfull of paper containg
a step-by-step disassembly of every single instruction
which was executed...

And the "HELP" command is a great improvement over the primitive
list that was necessary when using DOS:

a) Each command is explained in its own on-screen window.

b) You may page forward or backward through these help
windows, until you find what you want. Or you may ask
for help with a specific command.

4) An optional CCP has been included, which is the functional
equivalent of Digital Research's CCP. This allows those few
CP/M programs which mistakenly assume the presence of a CCP
to run under the Emulator.

5) The four most-needed terminals have been emulated: Televideo
950, VT52 (Heath/Zenith H-89), Osborne, and Kaypro. There is
also a Raw emulation, which shows absolutely everything which
is sent out. Needless to say, this emulation is much faster
(and more accurate) than that provided with version 3.10.

6) The Emulator now supports the NEC V20 and V30 chips. This may
seem exciting, and some users have purchased Z80MU PROFESSIONAL
for this feature alone. But in all honesty we must warn you
that NEC's implementation of the 8080 instruction set leaves
much to be desired. Z80MU PROFESSIONAL uses the NEC chips as
well and safely as they can be used, but these chips just
aren't what they're cracked up to be. If you have some very
safe and simple CP/M applications (like ASM, M80, L80, etc),
then the use of these NEC chips with the Emulator will give
very fast and safe performance. Just don't try to debug
anything using the NEC chips, and above all don't feed them
untested or buggy code. One wrong opcode and the NEC chips
can easily hang your PC...

7) A "SUBMIT" command has been included, which emulates CP/M's
own submit command, complete with parameter substitution.
There is no provision for XSUB support, but our implementation
has benefits (it doesn't go back to drive A for the submit file,
for example) which make it more desirable for use on PC hard disks.

8) Some CP/M applications use "CP/M-specific" BIOS and BDOS calls to
interrogate the disk environment. Under the public domain version
of Z80MU these programs were simply aborted. Z80MU PROFESSIONAL
allows you to decide whether to abort these programs or to feed
them emulated CP/M information which is obtained from DOS. This
alone allows many CP/M programs (TURBO PASCAL, for one popular
example) to run under Z80MU PROFESSIONAL which could not run under
the public domain version.

9) The accuracy of CP/M emulation has been improved. Z80MU version
3.10 was justly famous because it would run CP/M programs which
other emulators could not. Well, we have greatly improved the
emulation of CP/M even over the high standard created by version

a) The FCB fields change now in a way which is more
closely aligned with the way that CP/M used to change

b) During BDOS calls, the same Z80 registers are modified
that CP/M modified, and in the same [sometimes silly]

c) Certain oddball CP/M calls (we won't say which ones)
are handled by Z80MU PROFESSIONAL in a way identical to
the way that CP/M handled them. Without giving too many
details, we'll just say that this enables several hundred
more CP/M programs to run under Z80MU PROFESSIONAL which
would not run under the Z80MU version 3.10.

d) The RLD opcode (the only one of the 600-odd Z80 opcodes
which wasn't precisely emulated by Z80MU 3.10) has been

10) You may invoke your favorite PC editor from within Z80MU. This
makes source code development seamless and easy.

11) You may cause Z80 "IN" and "OUT" instructions to be mapped
to PC I/O addresses. Z80MU version 3.10 simply ignored these

12) Here are a few of the new commands:

SET_COLORSDefine colors to be used

SET_CPMECHOControl echo of CP/M screen output to the

SET_CPMLISTDefine the PC device to be used as the CP/M
"LIST" device.

SET_CPMPUNDefine the PC device to be used as the CP/M
"PUN" device.

SET_CPMRDRDefine the PC device to be used as the CP/M
"RDR" device.

SET_CPMPATHDefine a series of DOS directories to be
searched by Z80MU when looking for a CP/M .COM
file to be executed.

SET_CPUSelect the software Z80 emulated CPU, or the
hardware (and fast) 8080 CPU made available
by the NEC V20 and V30 chips.

SET_EDITORDefine your favorite PC editor to be used
within Z80MU.

SET_FAKEControl the result of hardware-specific BIOS
and BDOS calls (for example, to interrogate
the disk parameters).

SET_IOBASEControl the execution of Z80 IN and OUT

SET_KEYLoad a keyboard macro, to be played back
when the associated key is pressed.

SET_MASKControl the dubious CP/M practice of masking
output characters to 7 bits.

SET_SNOWControl the handling of "snow" on cheap
IBM CGA video screens.

SET_SOURCEChoose Z80 or 8080 mnemonics for disassembly.

SET_TERMSelect one of the builtin terminal emulations.

SET_VARSChoose whether or not to interpret "$"
characters in submit files as a parameter
substitution leadin.

TYPEDisplay one or more files in full-screen mode,
pausing between screens.

13) An executing CP/M program may call Z80MU to obtain certain PC
services (like controlling a serial port), and set or inquire
about various Z80MU settings. So if you've got a CP/M accounting
package which is set up for an H-19 terminal, for example,
you can have that program automatically tell Z80MU to select
H-19 emulation when it starts executing. Or if you are running
a CP/M communications program, then that program can set
Z80MU's I/O Base address so that it can access the PC's
communications port directly via IN and OUT instructions.

 December 14, 2017  Add comments

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