Apple Logic Board Información técnica descargar pdf (Pagina 30)

Thus, in order to specify a given block of memory in a 64K

or 128K board, the block designation number (8, 16, 32 or 64)

must be provided as well as the designation assigned to the

particular “32K section” of the board (256 = 1st 32K section, 512

= 2nd 32K section, 1024 3rd 32K section, 2048 4th 32K

section). Refer to section II.E for the actual procedure used to

tell RAMEXPAND which memory block to use.

E. SPECIAL REQUIREMENT IF LANGUAGE CARD IS PRESENT

The Apple Language Card requires special treatment for use

with RAMEXPAND. This is due to the presence of the Autostart ROM

on the Language Card (see Chapter 3, section III). The memory

allocation for RAMEXPAND has been modified slightly in order to

accomodate the language card. The RAMEXPAND block specification

numbers remain the same, with the only difference being that the

top 2K of each 12K block is not used by the RAMEXPAND system. As

a result the blocks corresponding to the numbers 8 and 16 are 10K

in size rather than 12K, when an Apple Language Card is used.

RAMEXPAND is told that a language card is present at the

initialization and installation step, when the system is being set

up.

II. USE OF RAMEXPAND

A. INSTALLING RAMEXPAND

The following procedure describes the steps which must be

taken in order to install RAMEXPAND in the system.

2. First load RAMEXPAND by running the loading program:

RAMEX PA. LOAD

This program loads the two portions of the RAMEXPAND system (the

portion which resides in the Saturn 64K and l2~?K RAM Board as

well as the “low” RAM portion residing at $BDOO to $BDFF). It

then sets HIMEM to protect the “low” RAM portion and sets up

locations 10 — 12 to point to the entry point of RAMEXPAND. Thus

RAMEXPAND can be called by simply using a CALL 10 or the USR

function (Applesoft).

When run, RAMEXPA.LOAD will ask for the slot into which

RAMEXPAND is to be loaded.

ENTER SLOT TO LOAD RAMEXPAND INTO:

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Apple Logic Board Información técnica Pagina 30