Apple Logic Board Información técnica descargar pdf (Pagina 51)

directory. The PSEUDO DISK can be accessed in the same manner as

a real disk, using the slot and drive designation previously

specified (default slot 5, Dl). Example: CATALOG S5, Dl will

display the catalog of the PSEUDO DISK.

IV. RECONNECTING THE PSEUDO DISK

Because the PSEUDO DISK system consists of special drivers

and some patches to DOS, every time the system is re—booted after

the PSEUDO DISK has been installed, these patches are overwrit-

ten, resulting in disconnection of the PSEUDO DISK. Any files

placed on the PSEUDO DISK are still present there, after the re-

boot (as long as the power remains on), however they are inacces—

sable until the driver routines and patches to DOS are re—instal-

led.

Installation of these patches can be accomplished using

option 3 of the PSEUDO DISK program, however this will result in

the directory being initialized, and any files present on the

PSEUDO DISK being wiped out. The patches can be re—installed

without disturbing the PSEUDO DISK directory by selecting option

4 of the menu in the PSEUDO DISK program.

V. PRECAUTIONS:

A. Although checks have been placed in the installation and

reconnection routines in order to prevent some conflicts

between memory usage by the PSEUDO DISK and the

relocated DOS, care should be taken not to inadvertently

destroy data on the PSEUDO DISK by loading programs or

data into portions of the card(s) being used by the

PSEUDO DISK (ex. loading BASIC into Bank 1 of the board

in slot 0, when this bank is being used by the PSEUDO

DISK.

B. INITIALIZING DISKS

Since the RWTS subroutine within the DOS present in

memory has been patched to operate with the pseudo—disk.

Care must be taken when initializing disks. When a

diskette is initialized (using INIT function) with the

pseudo—disk installed, a copy of the patched DOS is

written to the diskette. This diskette will not boot

properly because of the patches to DOS. It is therefore

recommended that diskettes be initialized only under a

standard DOS, prior to installation of the pseudo—disk,

so as to avoid this problem.

C. It is not necessary to run the set—up portion of the

PSEUDO DISK every time it is installed, but only when

a change in configuration is desired (when the memory

card(s) location(s) are changed).

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