Category : Pascal Source Code
Archive   : PASS_ALL.ZIP
Filename : TI149.ASC

PRODUCT : TURBO PASCAL NUMBER : 149
VERSION : ALL
OS : CP/M-80
DATE : March 4, 1986 PAGE : 1/1
TITLE : ROMMING CODE FOR CP/M-80




The following guidelines are for developers who wish to ROM Turbo
Pascal code. The guidelines assume that the developer has the
knowledge to undertake the task, hence are worded for the
experienced developer.

Guidelines:

1) Addresses 0-FF must be RAM and must reflect the normal usage
in a CP/M environment.

2) Address 1 is used to locate the BIOS vector (NOTE: this is
only relevant if you do not redefine device I/O procedures).

3) Address 6 is used to indicate the top of available memory.

4) Addresses A0-FF are used by the Run-Time system for local
variables (NOTE: this cannot be changed).

5) When a Turbo Pascal program terminates it calls address 0.

6) When compiling the program you must use the Options menu to
ensure that variables are placed in RAM.

7) Turbo Pascal does not make any BDOS calls unless the program
uses file I/O. Turbo Pascal does however make BIOS calls for
device I/O. In order to avoid these calls to the BIOS the
I/O procedure addresses should be changed by changing the
appropriate pointers ie., ConOutPtr, etc.