Apple Logic Board Información técnica descargar pdf (Pagina 16)

64K or 128K board as well as the relocated DOS. Also, through

the use of the DOS PSEUDO—DISK, the rest of the RAM board may be

used as a fast RAM—DISK, greatly improving disk access and

overall system performance (see Chapter 6)

I. FEATURES OF THE RELOCATED DOS

All the features of normal DOS are retained in this relo-

cated DOS, including the ability to initialize disks. When a

disk is initialized, the relocated DOS is written to the disk

from the Saturn 64K or 128K board. When this disk is later

booted, the relocated DOS is brought into the RAM board properly,

with everything set up to use it. Thus the program which does

the actual relocation (MOVEDOS) only needs to be run once.

The capability of using an Integer or Applesoft card in a

slot other than 0 has been added to this relocated DOS. This

enables one to take advantage of one of these cards if present,

as well as the Saturn RAM Board. Details of how to configure the

system to take advantage of this are given later.

MOVEDOS has been designed to operate with a 54K or 128K RAM

board in a slot other than 0, and properly relocate DOS into this

slot. MOVEDOS actually searches for the first 64K or 128K card

it finds starting at slot 0 and moving upward.

The language card and address conflict (see Chapter 3) has

been accomodated for in a special version of the MOVEDOS program

provided on the distribution diskette. This version of movedos

(MOVEDOS.LANG) has been designed to avoid the upper 2K of address

space on Saturn 64K or 128K RAM boards.

II. USING MOVEDOS

The software provided with the Saturn 64K or 128K RAM Board

is distributed on a 16—sector disk. It can be used directly with

DOS 3.3, however it is recommended that a back—up be made as soon

as possible. When using the software with DOS 3.2 it is sug-

gested that the programs be converted to 16 sector format using a

program such as DEMUFFIN prior to use. Again, a backup should be

maintained.

In order to relocate DOS, the program MOVEDOS is used. This

program moves the existing copy of DOS (3.3 or 3.2) resident at

the top of the 48K of user memory ($9600—$BFFF) into the second

16K bank of the Saturn 64K or 128K board and makes appropriate

changes to enable communication with this relocated DOS, in place

of the normal DOS. As stated previously, MOVEDOS does not

require that the Saturn RAM Board be present in slot fl, however

this positioning is recommended so that other software such as

PASCAL, VisiCalc, etc., will be able to find it.

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