Dec 312017
 
The Last Byte manager, version 2.31, makes more memory avialable by taking advantage of various manufacturers chips.

Full Description of File


THE LAST BYTE MEMORY MANAGER (vers. 2.31)
Loads device drivers, TSRs, and more
between 640k and 1 meg. Compatible w/DOS
6, Win 3.1, & all prot. mode software.
Requires 8088 or above and a supported
shadow ram controller, EMS, or R/W ram
in the UMA. Registration fee: $29.95


File TLB-V231.ZIP from The Programmer’s Corner in
Category Utilities for DOS and Windows Machines
The Last Byte manager, version 2.31, makes more memory avialable by taking advantage of various manufacturers chips.
File Name File Size Zip Size Zip Type
CHIPSET.DOC 39520 7041 deflated
CHIPSET.EXE 27841 27591 deflated
CLOCK.EXE 750 245 deflated
CONTENTS.DOC 2244 868 deflated
FILE_ID.DIZ 284 230 deflated
HIGHDRVR.SYS 11377 11339 deflated
HIGHDUBL.SYS 6332 6295 deflated
HIGHMEM.EXE 24961 24739 deflated
HIGHTSR.EXE 13362 13221 deflated
HIGHUMM.SYS 10959 10898 deflated
INSTALL.EXE 24809 24593 deflated
LASTBYTE.DOC 95323 25714 deflated
LASTBYTE.SYS 83680 60036 deflated
ORDERFRM.DOC 8854 2901 deflated
WHATSNEW.DOC 10718 3961 deflated

Download File TLB-V231.ZIP Here

Contents of the CHIPSET.DOC file







SHADOW RAM MEMORY CONTROLLERS

supported by


THE LAST BYTE MEMORY MANAGER (tm)







Version 2.31










Copyright (C) 1990-92
All Rights Reserved


by


KEY SOFTWARE PRODUCTS

440 Ninth Avenue
Menlo Park, California 94025
415-364-9847














The Last Byte Memory Manager is a trademark of Key Software Products.






TABLE OF CONTENTS



CHAPTER 1 - INTRODUCTION ........................... 1
1.1 Hardware Requirements ....................... 1
1.2 Supported Chipsets .......................... 1
1.2.1 ACC Microelectronics ................... 2
1.2.2 Acer Laboratories Incorporated (ALI) ..... 2
1.2.3 AddTech Research (PCChip) ............... 2
1.2.4 Appian Technology ...................... 3
1.2.5 Atmel Corporation ...................... 3
1.2.6 Biostar Systems (BIOTEQ) ................ 3
1.2.7 Chips and Technologies .................. 4
1.2.8 EFAR Microelectronics .................. 4
1.2.9 ETEQ Microelectronics .................. 5
1.2.10 Forex Computer Corporation ............. 5
1.2.11 Headland Technology (G2) ............... 6
1.2.12 Hedaka ............................... 6
1.2.13 HINT Corporation ...................... 6
1.2.14 Intel Corporation ..................... 6
1.2.15 Macronix Incorporated (MX) ............. 7
1.2.16 Micro Integration Corporation (MIC) ..... 7
1.2.17 Mosel Corporation ..................... 7
1.2.18 Oak Technology ........................ 8
1.2.19 OPTi Electronics ...................... 8
1.2.20 PC Chip ............................... 9
1.2.21 PicoPower Technology .................. 9
1.2.22 Silicon Integrated Systems (SiS) ........ 9
1.2.23 Sun Electronics (SUNTAC) ............... 10
1.2.24 Symphony Laboratories ................. 10
1.2.25 Texas Instruments (TI) ................. 11
1.2.26 UNIchip Incorporated .................. 11
1.2.27 United Microelectronics Corporation (UMC) 11
1.2.28 VIA Technologies ...................... 12
1.2.29 Victronix Technology .................. 12
1.2.30 VLSI Technology ....................... 12
1.3 Unsupported Chipsets ........................ 13
1.3.1 No Shadow Ram Support .................... 13
1.3.2 Shadow Ram is not Read/Write .............. 13
1.3.3 Overly Complex Control .................. 14
1.3.4 Locked Configuration Registers .......... 14
1.3.5 Configuration I/O Ports Reassigned ....... 14
1.4 Checking Compatibility Using CHIPSET .......... 14

















Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 1


CHAPTER 1 - INTRODUCTION


1.1 Hardware Requirements

To install The Last Byte Memory Manager, your computer must have
a means of providing read-write memory in the Upper Memory Area
between 640k and 1 megabyte. This is possible if you have any
of the following:

o Fixed RAM memory already resident in the upper area
(such as the 32-bit "Built In Memory" installed in
some Compaq 386 machines), or

o An expanded memory board (EEMS, LIM 3.2 EMS, or LIM
4.0 EMS), or


NOTE: Using a LIM 3.2 EMS board is not advised
as a method of providing upper memory. It pro-
vides only 64k of upper memory and prevents ap-
plication software from using expanded memory.


o A 386sx, 386, 486, or 486sx processor and the
Microsoft Windows 3.0/3.1 or DOS 5 versions of
EMM386, or

o One of the shadow ram memory controller chips
listed in this document.


1.2 Supported Chipsets

Key Software Products is continually adding support for new
chipsets as they become known to us and technical information
can be obtained. Those that are currently supported in version
2.31 are listed in the paragraphs below. Some that we know of,
but which cannot be supported are listed near the end of this
document.

In what follows, you will occassionally see "+32k" appended to
the end of the total amount of shadow ram indicated for a
particular chipset. This means that there is shadow ram in the
F000-FFFF region, but that it is read-only; however, if you have
a VGA or EGA adapter and a "split" bios, you may be able to gain
up to an additional 32k by using the MOVE=OVERLAY option of
LASTBYTE.SYS.

An adapter card (like some disk controllers) that uses a portion
of the upper memory address space usually requires that shadow



Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 2


ram in the same address space be disabled. Thus shadow ram is
usually organized into segments that can be individually enabled
or disabled. Even though an adapter may only use a small
portion of one shadow ram segment, the entire segment must be
disabled. How this affects your system can be determined by the
information under the columns labelled "Organization".


1.2.1 ACC Microelectronics

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
ACC2036 64k Page Frame 4x16k
ACC2121 64k Page Frame 4x16k
ACC2300 128k E0000-FFFFF 1x128k

Part Number Manufacturer's Description
----------- --------------------------
ACC2036 Single Chip Solution for the 286 and 386SX
ACC2121 Turbo PC/AT Chip Set for the 286 and 386SX
ACC2300 82300 386 AT Chip Set


1.2.2 Acer Laboratories Incorporated (ALI)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
M1217 256k C0000-FFFFF 8x32k
M1219 256k C0000-FFFFF 8x32k
M1419 256k C0000-FFFFF 8x32k

Part Number Manufacturer's Description
----------- --------------------------
M1217 80386SX Single Chip
M1219 80486SX/80486DX Single Chip
M1419 ISA 486/386 Cache System Chipset


1.2.3 AddTech Research (PCChip)

AddTech chipsets are usually labelled "PCChip" or "Hedaka".
AddTech designs their chips for use on their own motherboards,
and they identify their chipsets by the motherboard part
numbers. There is at least one AddTech chipset that is used on
two different motherboards with different motherboard part
numbers. To avoid confusion, The Last Byte Memory Manager
refers to these chips using "PCCHIP" followed by a unique
number.






Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 3


Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
PCCHIP1 256k C0000-FFFFF 16x16k
PCCHIP2 192k+32k C0000-EFFFF 12x16k

Part Number Manufacturer's Description
----------- --------------------------
PCCHIP1 Used on 286/386SX AT motherboards M205 and M209
PCCHIP2 Used on 386 AT motherboard M321


1.2.4 Appian Technology

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
P915 256k C0000-FFFFF 16x16k

Part Number Manufacturer's Description
----------- --------------------------
P915 486/386DX System Controller


1.2.5 Atmel Corporation

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
AT40281 192k+32k C0000-EFFFF 12x16k
AT40283 192k+32k C0000-EFFFF 12x16k
AT40391 192k+32k C0000-EFFFF 12x16k
AT40493 192k+32k C0000-EFFFF 12x16k
AT40495 192k+32k C0000-EFFFF 12x16k
AT40498 192k+32k C0000-EFFFF 12x16k

Part Number Manufacturer's Description
----------- --------------------------
AT40281 386SX Core Logic Controller w/Cache
AT40283 386SX Core Logic Controller w/o Cache
AT40391 80386DX PC/AT Chip Set
AT40493 80486DX PC/AT Chip Set
AT40495 80486SX PC/AT Chip Set
AT40498 80486 Core Logic Controller


1.2.6 Biostar Systems (BIOTEQ)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
82C3480 256k C0000-FFFFF 8x32k






Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 4


Part Number Manufacturer's Description
----------- --------------------------
82C3480 ISA 486/386 Cache System Chipset


1.2.7 Chips and Technologies

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
82C212 384k A0000-FFFFF 24x16k
82C222 384k A0000-FFFFF 24x16k
82C230 384k A0000-FFFFF 24x16k
82C235 384k A0000-FFFFF 24x16k
82C241 384k A0000-FFFFF 24x16k
82C302 384k A0000-FFFFF 24x16k
82C307 384k A0000-FFFFF 24x16k
82C311 384k A0000-FFFFF 24x16k
82C322 384k A0000-FFFFF 16x16k+1x128k
82C351 384k A0000-FFFFF 24x16k
82C812 384k A0000-FFFFF 24x16k
82C836 384k A0000-FFFFF 24x16k
82C841 384k A0000-FFFFF 24x16k
84021 384k A0000-FFFFF 2x64k+4x16k+3x64k
84031 384k A0000-FFFFF 2x64k+4x16k+3x64k

Part Number Manufacturer's Description
----------- --------------------------
82C212 CS8221 NEAT (tm) chipset
82C222 CHIPS/250 PS/2 50/60 chipset
82C230 PS/2 30 Single Chip Controller
82C235 SCAT (tm) Single Chip AT VLSI chip
82C241 CS8223 LeAPset (tm) chipset
82C302 CS8230 386/AT CHIPSet (tm)
82C307 CS8231 386/AT CHIPSet (tm)
82C311 CS8233 PEAK 386/AT CHIPSet (tm)
82C322 CHIPS/280 PS/2 70/80 chipset
82C351 CS82310 PEAK DM/386 AT CHIPSet (tm)
82C812 CS8281 NEATsx (tm) chipset
82C836 SCATsx (tm) Single Chip AT VLSI chip
82C841 CS8283 LeAPset-sx (tm) chipset
84021 ISA/486 chipset
84031 ISA/486 chipset

The 84021 provides up to 384k of memory, but any of the first
two and last two 64k blocks might be "locked" and unavailable
due to the design of your particular bios. This may reduce the
amount of memory from 384k to as little as 128k.







Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 5


1.2.8 EFAR Microelectronics

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
82EC495 192k+32k C0000-EFFFF 12x16k
82EC798 192k+32k C0000-EFFFF 12x16k

Part Number Manufacturer's Description
----------- --------------------------
82EC495 EF8290WB 486/386 PC/AT ChipSet
82EC798 EC798 386/486 PC/AT Single Chip


1.2.9 ETEQ Microelectronics

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
ET6000 192k+32k C0000-EFFFF 3x64k
ET82C391 192k+32k C0000-EFFFF 12x16k
ET82C491 192k+32k C0000-EFFFF 12x16k
ET82C4901 192k+32k C0000-EFFFF 12x16k
ET9000 192k+32k C0000-EFFFF 3x64k
ET9800/ET391SX 192k+32k C0000-EFFFF 3x64k

Part Number Manufacturer's Description
----------- --------------------------
ET6000 Cheetah 486DX/SX Non-Cache System
ET82C391 Bobcat 386DX/486DX chipset
ET82C491 Cougar 386DX/486DX chipset
ET82C4901 Bengal 386DX/486DX chipset
ET9000 Jaguar 486DX/SX Cache System
ET9800/ET391SX Firefox 386SX Write Back chipset


If you have a ET9800/ET391SX chipset and an
adapter that occupies non-shadow ram address
space between C8000-CFFFF, you will need to re-
configure that adapter to use another location.


The CHIPSET program cannot distinguish between the ET82C391 and
ET82C491.


1.2.10 Forex Computer Corporation

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
FRX36C300 256k C0000-FFFFF 6x32k+1x64k
FRX46C411 256k C0000-FFFFF 6x32k+1x64k
FRX46C421 256k C0000-FFFFF 6x32k+1x64k



Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 6



Part Number Manufacturer's Description
----------- --------------------------
FRX36C300 FRX36C300/200 Cache chipset
FRX46C411 FRX46C411/412 Cache chipset
FRX46C421 FRX46C421/422 Cache chipset


1.2.11 Headland Technology (G2)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
HT12 64k Page Frame 4x16k
HT18 128k C0000-DFFFF 8x16k
HT21 128k C0000-DFFFF 8x16k
HT22 128k C0000-DFFFF 8x16k
HT103 128k C0000-DFFFF 8x16k
HT113 128k C0000-DFFFF 8x16k

Part Number Manufacturer's Description
----------- --------------------------
HT12 Single 286 AT Chip
HT18 286/386SX Advanced Memory Manager Chip
HT21 286/386SX Advanced Memory Manager Chip
HT22 286/386SX Advanced Memory Manager Chip
HT103 286/386SX Advanced Memory Manager Chip
HT113 286/386SX Advanced Memory Manager Chip

The CHIPSET program cannot distinguish between the HT18 and
HT22.


1.2.12 Hedaka

See section on AddTech Research.


1.2.13 HINT Corporation

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
HINT8001 256k C0000-FFFFF 4x32k+2x64k
HINT8005 256k C0000-FFFFF 4x32k+2x64k

Part Number Manufacturer's Description
----------- --------------------------
HINT8001 Caesar Super ISA chipset
HINT8005 VLISA Single Chip






Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 7


1.2.14 Intel Corporation

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
82343 192k+32k C0000-EFFFF 12x16k
82346 192k+32k C0000-EFFFF 12x16k
82359 384k A0000-FFFFF 24x16k

Part Number Manufacturer's Description
----------- --------------------------
82343 82340SX Chip Set
82346 82340DX Chip Set
82359 82350DT EISA Chip Set


1.2.15 Macronix Incorporated (MX)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
MX83C305 256k C0000-FFFFF 6x32k+1x64k

Part Number Manufacturer's Description
----------- --------------------------
MX83C305 Compactest 386DX Chipset with Cache


1.2.16 Micro Integration Corporation (MIC)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
MIC9283 192k+32k C0000-EFFFF 12x16k
MIC9382 192k+32k C0000-EFFFF 12x16k
MIC9391 192k+32k C0000-EFFFF 12x16k
MIC9498 192k+32k C0000-EFFFF 12x16k

Part Number Manufacturer's Description
----------- --------------------------
MIC9283 386SX PC/AT Single Chip w/Posted Write or Write-Thru
MIC9382 386DX PC/AT Chip Set w/Write-Thru Cache
MIC9391 386DX PC/AT Chip Set w/Write-Back Cache
MIC9498 486DX PC/AT Single Chip w/Write-Back Cache


1.2.17 Mosel Corporation

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
MS400 256k C0000-FFFFF 4x16k+3x64k






Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 8


Part Number Manufacturer's Description
----------- --------------------------
MS400 486SX/DX Single Chip AT


1.2.18 Oak Technology

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
OTI-021 256k C0000-FFFFF 4x32k+2x64k
OTI-041 256k C0000-FFFFF 4x32k+2x64k

Part Number Manufacturer's Description
----------- --------------------------
OTI-021 OTI-020 Desktop PC Chip Set
OTI-041 OTI-040 OakNote Chip Set

The CHIPSET program cannot distinguish between the OTI-021 and
OTI-041.


1.2.19 OPTi Electronics

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
82C281 192k+32k C0000-EFFFF 12x16k
82C282 192k+32k C0000-EFFFF 12x16k
82C283 192k+32k C0000-EFFFF 12x16k
82C291 256k C0000-FFFFF 12x16k+1x64k
82C295 256k C0000-FFFFF 12x16k+1x64k
82C382 192k+32k C0000-EFFFF 12x16k
82C391 192k+32k C0000-EFFFF 12x16k
82C461 192k+32k C0000-EFFFF 12x16k
82C463 192k+32k C0000-EFFFF 12x16k
82C482 192k+32k C0000-EFFFF 12x16k
82C491 192k+32k C0000-EFFFF 12x16k
82C493 192k+32k C0000-EFFFF 12x16k
82C495 192k+32k C0000-EFFFF 12x16k
82C495SLC 192k+32k C0000-EFFFF 12x16k
82C495SX 192k+32k C0000-EFFFF 12x16k
82C496A 192k+32k C0000-EFFFF 12x16k
82C496B 256k C0000-FFFFF 12x16k+1x64k
82C498 192k+32k C0000-EFFFF 12x16k
82C499 192k+32k C0000-EFFFF 12x16k
82C597 256k C0000-FFFFF 8x16k+2x64k
82C682 256k C0000-FFFFF 8x16k+2x64k
82C683 256k C0000-FFFFF 8x16k+2x64k
82C801 192k+32k C0000-EFFFF 12x16k
82C802 192k+32k C0000-EFFFF 12x16k





Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 9


Part Number Manufacturer's Description
----------- --------------------------
82C281 Cache SX/AT chipset
82C282 Non-Cache SX/AT chipset
82C283 Block Interleave SX/AT chipset
82C291 SXWB PC/AT chipset
82C295 SLCWB PC/AT chipset
82C382 HiD/386 AT chipset
82C391 386WB PC/AT chipset
82C461 Notebook PC/AT chipset
82C463 SCNB Single Chip Notebook chipset
82C482 HiB/486 AT chipset
82C491 486SXWB PC/AT chipset
82C493 486SXWB PC/AT chipset
82C495 486SXWB PC/AT chipset
82C495SLC 495SLC PC/AT chipset
82C495SX LCWB PC/AT chipset
82C496A DXBB PC/AT chipset (Rev. A)
82C496B DXBB PC/AT chipset (Rev. B)
82C498 DXWB PC/AT chipset
82C499 DXSC PC/AT Single Chip
82C597 PTMA WB-V PC/AT chipset
82C682 386/486WB EISA chipset
82C683 386/486AWB EISA chipset
82C801 SCWB2 PC/AT Single Chip
82C802 SCWB2 PC/AT Single Chip

The CHIPSET program cannot distinguish between the 82C281 and
82C282, or among the 82C491, 82C493, and 82C495, or between the
82C291 and 82C295.


1.2.20 PC Chip

See section on AddTech Research.


1.2.21 PicoPower Technology

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
PT86C168 256k C0000-FFFFF 12x16k+1x64k
PT86C268 256k C0000-FFFFF 12x16k+1x64k

Part Number Manufacturer's Description
----------- --------------------------
PT86C168 Evergreen Portable Computer Core Logic Chip
PT86C268 Evergreen HV Core Logic Chip (Hybrid 3.3v/5.0v)






Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 10


1.2.22 Silicon Integrated Systems (SiS)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
85C360 256k C0000-FFFFF 6x32k+1x64k
85C401 256k C0000-FFFFF 6x32k+1x64k
85C411 256k C0000-FFFFF 6x32k+1x64k
85C460 256k C0000-FFFFF 6x32k+1x64k
85C461 256k C0000-FFFFF 6x32k+1x64k

Part Number Manufacturer's Description
----------- --------------------------
85C360 ISA 386DX Single Chip
85C401 ISA 486DX/SX Chipset
85C411 EISA 386/486 Chipset
85C460 ISA 486DX/SX Single Chip
85C461 ISA 486DX/SX Single Chip

The CHIPSET program cannot distinguish between the 85C460 and
85C461.


1.2.23 Sun Electronics (SUNTAC)

All SunTac chips provide 128k of memory in four 32k blocks
between E0000-FFFFF. An additional 128k in eight 16k blocks
between C0000-DFFFF is available at the expense of all Expanded
Memory by adding the word NOEMS to the SUNTAC Physical option as
in: Physical=ST62C202,NOEMS.

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
ST62C202 128k/256k C0000-FFFFF [8x16k]+4x32k
ST62C241 128k/256k C0000-FFFFF [8x16k]+4x32k
ST62C251 128k/256k C0000-FFFFF [8x16k]+4x32k

Part Number Manufacturer's Description
----------- --------------------------
ST62C202 Chipset 20 for 286
ST62C241 Chipset 24 for 386
ST62C251 Chipset 25 for 286 and 386sx


1.2.24 Symphony Laboratories

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
SL82C361 256k C0000-FFFFF 8x16k+2x64k
SL82C461 256k C0000-FFFFF 8x16k+2x64k
SL82C471 256k C0000-FFFFF 8x16k+2x64k




Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 11


Part Number Manufacturer's Description
----------- --------------------------
SL82C361 Haydn SL82C360 80386DX/SX chipset
SL82C461 Haydn SL82C460 80486 chipset
SL82C471 Mozart SL82C470 486/386 EISA chipset


1.2.25 Texas Instruments (TI)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
TACT82411 384k A0000-FFFFF 24x16k
TACT82S411 384k A0000-FFFFF 24x16k
TACT83442 256k C0000-FFFFF 16x16k

Part Number Manufacturer's Description
----------- --------------------------
TACT82411 Snake Single-Chip AT Controller
TACT82S411 Snake+ Single-Chip AT Controller
TACT83442 Tiger TACT83000 AT Chip Set


The TACT83442 can only be supported if the main
bios has not reassigned the I/O ports that are
used to access the configuration registers from
their default values.



1.2.26 UNIchip Incorporated

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
U4800 192k+32k C0000-EFFFF 3x64k

Part Number Manufacturer's Description
----------- --------------------------
U4800 386/486 AT Chip Set


1.2.27 United Microelectronics Corporation (UMC)

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
UM82C212 384k A0000-FFFFF 24x16k
UM82C481 256k C0000-FFFFF 8x16k+2x64k

Part Number Manufacturer's Description
----------- --------------------------
UM82C212 UM82C210 386SX/286 AT Chip Set
UM82C481 UM82C480 50Mhz 80486 Chip Set



Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 12




1.2.28 VIA Technologies

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
VT82C470 256k C0000-FFFFF 8x16k+2x64k
VT82C475 256k C0000-FFFFF 8x16k+2x64k
VT82C495 256k C0000-FFFFF 8x16k+2x64k

Part Number Manufacturer's Description
----------- --------------------------
VT82C470 - From the Jupiter Chip Set (w/o cache)
VT82C475 - From the Jupiter Chip Set (w/cache)
VT82C495 - From the Venus Chip Set


1.2.29 Victronix Technology

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
VIC92C4800 192k+32k C0000-EFFFF 12x16k

Part Number Manufacturer's Description
----------- --------------------------
VIC92C4800 486DX/SX ISA PC/AT Non-Cache Single Chip


1.2.30 VLSI Technology

Part Number Shadow Ram Address Range Organization
----------- ---------- ------------- ------------
VL82C202 384k A0000-FFFFF 6x64k
VL82C310 384k A0000-FFFFF 4x32k+8x16k+4x32k
VL82C311 384k A0000-FFFFF 4x32k+8x16k+4x32k
VL82C315 384k A0000-FFFFF 4x32k+8x16k+4x32k
VL82C316 384k A0000-FFFFF 4x32k+8x16k+4x32k
VL82C320 192k+32k C0000-EFFFF 12x16k
VL82C330 192k+32k C0000-EFFFF 12x16k
VL82C480 384k A0000-FFFFF 24x16k
VL82C481 384k A0000-FFFFF 24x16k
VL82C486 384k A0000-FFFFF 24x16k

Part Number Manufacturer's Description
----------- --------------------------
VL82C202 PC/AT-Compatible High Speed Memory Controller
VL82C310 SCAMP 286/386sx Chip Set
VL82C311 SCAMP 286/386sx Chip Set
VL82C315 SCAMP II PC/AT-Compatible System Controller
VL82C316 SCAMP II Chip Set for Power-Managed Portables
VL82C320 TOPCAT 286/386sx Chip Set



Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 13


VL82C330 TOPCAT 386 DX Chip Set
VL82C480 486 System/Cache/ISA Bus Controller
VL82C481 486 System/Cache/ISA Bus Controller
VL82C486 Single Chip, High Performance 486 PC/AT Controller


Pin 69 on th VL82C202 controls whether its
shadow ram is enabled or relocated. This pin
is usually tied to a jumper on the motherboard
which must be set properly to work.


The CHIPSET program cannot distinguish between the VL82C315 and
VL82C316.


1.3 Unsupported Chipsets

If your computer has shadow ram capability, then it probably has
a shadow ram memory controller. However, some of these chipsets
cannot be supported by The Last Byte Memory Manager for reasons
shown below.

Some of these chips, however, do have hardware EMS support and
thus many of their motherboards come with an EMS device driver
designed specifically to take advantage of this capability. So
in many cases, you can install this driver first, and then The
Last Byte Memory Manager can use it to manage the upper memory
area.


1.3.1 No Shadow Ram Support

Some of the older chipsets do not provide shadow ram
capability.

Examples: VLSI Technologies 82C100 series
Western Digital chipsets
Texas Instruments TACT82300 series
Early Suntac chipsets (ST62BC001-6)
United Microelectronics Corp. UM82C231


1.3.2 Shadow Ram is not Read/Write

Some chipsets have shadow ram, but can only put it into either
write-only mode (for copying rom contents to ram), or read-only
mode (to prevent accidental writes into what's supposed to be a
copy of rom). The hardware EMS in some such chipsets sometimes
provides a limited amount (e.g., 64k) of Hi-DOS memory, but only
if the user doesn't need expanded memory.



Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 14



Examples: CONTAQ 82C591 (no hardware EMS support)
Headland/G2 (many do have hardware EMS however)
ACC Microelectronics (many do have hardware EMS)
USA Integration (USAi) (no hardware EMS)


1.3.3 Overly Complex Control

The Last Byte Memory Manager software is table-driven, making it
relatively easy to adapt to different memory controller
architectures, but there are limits!

Examples: Zymos/Appian System 90 chipset
United Microelectronics Corp UM82C384, '388, '389
Forex Computer Corp. FRX36C100
Silicon Integrated System (SiS) 85C310.


1.3.4 Locked Configuration Registers

Some memory controllers are designed so that they can be
"locked" at the end of the main bios initialization, requiring a
hardware reset to unlock, and thus preventing The Last Byte
Memory Manager from accessing the controller.

Examples: Intel 82335, 82335SX


1.3.5 Configuration I/O Ports Reassigned

Some memory controllers are designed so that the "index/data"
pair of I/O ports used to access the configuration registers can
be reassigned to different I/O addresses. This makes the
configuration registers effectively inaccessible to The Last
Byte Memory Manager since it has no way of knowing what new I/O
port addresses may have been established within the main bios.

Examples: Texas Instruments TACT84500
GS Technology GS62CS03



1.4 Checking Compatibility Using CHIPSET

CHIPSET is a program that attempts to determine if your computer
has one of the memory controllers required to use The Last Byte
Memory Manager. To run CHIPSET, simply enter its name on the
command line:

A>CHIPSET




Copyright (C) 1990-92, Key Software Products. All Rights Reserved


Nov 06, 1993 SHADOW RAM MEMORY CONTROLLERS 15


and follow the prompts. CHIPSET will try to identify the
particular memory controller you have, if any. If it can't find
a memory controller, it will look for fixed memory in the upper
area or expanded memory as a means of installing The Last Byte
Memory Manager. If it is successful, it will give you the
option of automatically linking to the INSTALL program to setup
for use of The Last Byte Memory Manager.

CHIPSET automatically senses whether you have a color or
monochrome display to determine how to present data on the
screen. However, you may force the mode by using one of the
command line options: /MONO or /COLOR (for monochrome liquid
crystal displays).

If your computer has one of the listed devices, then The Last
Byte Memory Manager should work on your computer.






































Copyright (C) 1990-92, Key Software Products. All Rights Reserved



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