Apple Logic Board Información técnica descargar pdf (Pagina 68)

2. Select option 2 to change the number of directory blocks

(Default = 1)

NOTE: Each directory block can hold 32 directory entries.

Once all of the cards have been specified and the parameters

entered, select 3 to exit and 3 once again to exit back to the

main menu. The system will update the PARAM.DAT file with the

new parameters.

The last thing that must be done prior to installation of

the PSEUDO DISK is to set up the INIT.COM and INIT2.COM files.

These programs are what are used to install the PSEUDO DISK

by patching CP/M. They are set up with the parameters entered

during the set—up procedure (option 2).

Select option 3 at this time to set up INIT.COM and

INIT2.COM. The system will access the disk and pause frequently

during this set up procedure.

Once these files have been set up, the program will

terminate, exiting back to CP/M system level.

II. INSTALLING THE PSEUDO DISK

After the PSEUDO DISK has been set up, it is installed by

simply executing the file INIT.COM. This action results in the

driver routines to the PSEUDO DISK being loaded into the I/O

configuration block and CP/M BIOS being patched to utilize these

drivers. The last step in this initialization involves erasing

the directory of the PSEUDO DISK.

The program INIT2.COM is identical to INIT.COM except for

the fact that the directory is not erased.

This is useful if CP/M had been COLD Booted after the PSEUDO

DISK had been installed, and access to the files present on the

PSEUDO DISK prior to the boot is desired. INIT2.COM will not

wipe out these files, whereas INIT.COM would destroy them because

it would erase the directory.

NOTE: It is not necessary to run the set—up portion of the

PSEUDO DISK every time the PSEUDO DISK is to be installed. It is

only necessary to set up the PSEUDO DISK when a change in the

configuration is desired. (i.e. when the memory card locations

are changed or the disk parameters are modified) In fact, the

only files which are necessary for installation of the PSEUDO

DISK (after set—up has been accomplished) are INIT.COM and

INIT2.COM.

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Apple Logic Board Información técnica Pagina 68