Apple Logic Board Technical Information PDF herunterladen (Seite 11)

A. APPLE II:

Since Apple II’s are provided with Integer BASIC in ROM,

Applesoft can be made available by loading it into the Saturn 64K

and 128K RAM Board (first 16K bank of this card). When Applesoft

is required, it can be accessed by typing FP. The portion of the

first bank of the Saturn RAM Board containing Applesoft is then

enabled, which brings APPLESOFT into the machine in place of the

main board ROM Basic (INTEGER).

B. APPLE II PLUS:

Apple II plus’ have Applesoft in ROM. Integer BASIC can be

loaded into the Saturn 64K or 128K board and accessed later by

typing INT. This results in enabling the portion of the RAM

board which contains Integer, bringing it into the Apple in place

of Applesoft. In either case, as far as this application is

concerned, the Saturn RAM Board operates as either an Integer

card (for Apple II Plus) or an Applesoft card (for Apple II).

For the above operation to occur,the Saturn card MUST be

located in slot 0, and, as a result, an Integer or Applesoft card

previously in slot 0 is no longer used, once the Saturn RAM Board

has been located in this slot. There is no provision in the

standard DOS 3.2 or 3.3 for accessing an Applesoft or Integer

card which is located in a slot other than zero. However, this

capability has been provided in the DOS relocation software

(MOVEDOS) included with the Saturn 64K and 128K RAM Boards (see

Chapter 4).

II. SATURN RAM BOARD OPERATION WITH DOS 3.3

DOS 3.3 is designed to take advantage of an Apple Language

card, 16K memory card, or Apple Firmware card (INTEGER or

APPLESOFT card). The HELLO program provided on the distribution

copy of DOS 3.3 tests for the presence of an Integer or Applesoft

card, or language card (16K memory card) in slot 0, and if the

latter is present, loads the required language (Applesoft in an

Apple II, or Integer in an Apple II Plus) from disk into the

memory card. The distribution copy of DOS 3.3 contains copies of

the ROM versions of both Applesoft and Integer BASIC, saved as

binary files. Whenever DOS 3.3 is booted, this loading process

is repeated, provided that the HELLO program as well as the

required BASIC (binary file) is present on the particular disk

being booted.

In this respect the Saturn 64K or 128K RAM board operates as

a language card, and appears to DOS as such. If placed in slot

0, the required Basic will be automatically loaded upon boot,

just as occurs with the Apple Language card, or other 16K memory

boards.

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