Apple Logic Board Información técnica descargar pdf (Pagina 28)

$FFFF -------------------

12k 12k

$EOOO [8] ------- [16]

4k 4k

[32] [64]

$DOOO -------

16K Bank 1 16K Bank 2

The following table gives the relationship between RAMEXPAND

block designations and the bank designations established in the

Technical Information Chapter of the Saturn 32K RAM board manual.

RAMEXPAND

16K

bank Size DESIGNATION

1 12K 8 4K Bank lA + memory in region

$EOOO — $FFFF

1 4K 32 4K Bank lB

2 12K 16 4K Bank 2A + memory in region

$EOOO — $FFFF

2 4K 64 4K Bank 2B

The RAMEXPAND block designations for a 15K RAM board

correspond to those which are used to describe the first l6K bank

in the above figure. Thus,

12K block = RAMEXPAND block designation 8

4K block = RAMEXPAND block designation 32

2. SATURN 64K and 128K RAM Boards

The Saturn 128K RAM board can be thought of as consisting of

four 32K RAM boards (or sections), whereas the 64K board can be

described in terms of two 32K sections. The block designation

numbers for each bank within these 32K sections is the same as

given above for the Saturn 32K board. Thus the designation

numbers for the 12K blocks within the “32K sections” are 8 and

16, and the 4K blocks are 32 and 64.

In addition to this block specification number, the

particular “32K section” which contains the desired block must

also be specified. These are indicated using the “32K section”

designation numbers given in the following figure.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 76 77

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Apple Logic Board Información técnica Pagina 28