Caple C871i Bedienungsanleitung PDF herunterladen (Seite 471)

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Apple II Computer Info

WRITE: A contains byte to write

READ: Byte read is returned in A

STATUS: A=0 for 'are you ready for output', A=1 for 'do you have input

ready'. In both cases, the SSC will return with carry set if the

answer to the question is 'yes'.

You could go down to the hardware level if you want. Use the serial

firmware to initialize the card (baud rate, etc.)

To transmit:

LDX #$s0 ; s is slot number, e.g. $20 for slot 2

LDA $C089,X ; read status register

AND #$10 ; test Transmitter Empty flag

BEQ IsBusy

LDA Byte_to_send ; get the byte you want to transmit

STA $C088,X ; stick it in the transmit data register

To receive:

LDX #$s0 ; s is slot number, as above

LDA $C089,X ; read status register

AND #$08 ; test Receive Full flag

BEQ NoByte

LDA $C088,X ; get the received byte

STA Byte_received

> I also seem to be unclear in regard to initializing the devices (can

> both the printer card and the SSC be active at the the same time?

Using the BASIC interface, you can only have one input device and one

output device. For example, in Applesoft BASIC, you can do a PR#1 to

output to slot 1, and an IN#2 to input from slot 2.

If you use the PASCAL interface or talk to the hardware directly, you

can do simultaneous I/O to as many slots as you like.

> The printer card is an Apple Dumpling, and is equally spare in

> details. All it gives is a sample 12 line driver which I can't seem

> to get to work.

Sorry, I know nothing about this card. Check the above ID bytes to

see if it supports the Pascal interface. If it does, you're home

free. If it doesn't,... I've given you half the solution, anyway.

David Empson

USENET: [email protected]

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### ssc.example

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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 : 471 of 572

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