Apple Logic Board Información técnica descargar pdf (Pagina 65)

CHAPTER 8

CP/M PSEUDO DISK

The CP/M PSEUDO DISK is a software package which sets up

Saturn RAM boards for use as a fast “RAM” disk drive under the

CP/M operating system. It will operate with Saturn 32K, 64K,

128K RAM boards, as well as standard 16K RAM cards. Patches are

made to the BIOS portion of CP/M to fool it into thinking that

the memory on the board(s) is just another disk drive. In this

respect the RAM board is made to emulate a disk drive, and as a

result, applications programs are be able to take advantage of

dramatically increased data transfer rate and throughput.

The software included in this package serves to set up the

PSEUDO DISK system, patch CP/M and install the controlling

routines. These functions are performed by the following programs:

PSEUDO.BAS This program is used to set up the PSEUDO

DISK and includes a facility for telling the

system where the memory cards are, as well as

the entry of disk parameters. The program

patches these parameters into the PSEUDO DISK

installation programs INIT.COM and INIT2.COM.

PSEUDO.COM This machine language program actually sets

up the PSEUDO DISK driver routines with

appropriate parameters entered during the

set—up procedure. The program is loaded and

executed by PSEUDO.BAS. INIT.COM and

INIT2.COM are created from PSEUDO.COM.

INIT

. COM When this program is executed, it patches the

routines. It then initializes the PSEUDO DISK

INIT2.COM This program performs the same function as

INIT.COM, except that it does not erase the

directory after installing the PSEUDO DISK

driver routines.

PARAM.DAT This file contains the parameters entered

during the set—up procedure (drive for PSEUDO

DISK, location and types of memory cards,

etc) and is used by PSEUDO.BAS to generate

INIT.COM and INIT2.COM.

There are two basic steps which must be taken prior to using

the PSEUDO DISK:

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Apple Logic Board Información técnica Pagina 65