Caple C871i Uživatelský manuál stáhnout pdf (Strana 336)

100

101

Apple II Computer Info

(ie $C700 - C7FF for slot 7, etc.)

2. If A0 and A1 are both low then the data bus is written to the

output latch and an output STB- is initiated. Also, the ACK

latch at U2C is reset.

3. If A1 is high then the interrupt latch is reset. (U1B)

4. If A2 is high then the interrupt latch is set. (U1A

Point 2. above is why the card also performs output on $C084,Y.

Anyway, after all this messing about I'll be able to program an 2716

just once with some minimal interface code and from then on

everything else will be downloadable from the IBM in a convenient

way. So when I show my friends a highly modifed board crawling with

jumper wires and cables leading here and there and if anyone asks me

what's the point, I'll just say -- hacking, that's what the Apple 2

was all about (originally) -- and despite mega this and giga that on

the latest Pentiums, the spirit lives on.

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 336 of 572

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Caple C871i Uživatelský manuál Strana 336

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