Caple C871i Manuel d'utilisateur télécharger pdf (Page 286)

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101

Apple II Computer Info

The "write enable" locations ($C081, $C083, $C089 and $C08B) require a

special sequence to enable write access. Two or more consecutive READ

accesses to the location are required to enable writes (e.g. two LDA

instructions).

The current state of these soft-switches can be detected on the IIe by

reading bit 7 of the following locations:

$C011 Read bank 2 select state (set for bank 2, clear for bank 1)

$C012 Read RAM read enable state (set for RAM read, clear for ROM read)

It is not possible to read the write-enable state of the language card RAM.

David Empson

[email protected]

Snail mail: P.O. Box 27-103, Wellington, New Zealand

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Apple II Computer Technical Information : Apple II Family Hardware Info

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Caple C871i Manuel d'utilisateur Page 286

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