Caple C871i Instrukcja Użytkownika Pobierz pdf (Strona 488)

100

101

Apple II Computer Info

you, or if you have your modem set to auto-answer and someone phones in

with a modem carrier.

The last one won't ever occur if you are not transmitting.

Remember the following two quirks about the 6551 as well:

o You cannot send if you have the DTR signal set to false.

o You cannot receive if the DCD signal is false.

For those with the expertise to understand how to program ACIA's, here is a

little informatin about the 6551 specifically on a Super Serial Card or

inside an Apple //c and Apple //c Plus taken from Leventhal, 6502 Assembly

Language Programming, McGraw Hill, ISBN 0-07-881216-X:

CTRLREG ($C08B + $n0) (read/write)

7 - stop bits

0 = 1 stop bit

1 = 2 stop bits, or

1 stop bit if word length = 8 bits and parity, or

1.5 stop bits if word length = 5 bits and no parity

65 - word length (data byte size)

0 0 = 8

0 1 = 7

1 0 = 6

1 1 = 5

4 - receiver clock source

0 = external receiver clock

1 = internaal baud rate generator

3210 - internal baud rate generator

0 0 0 0 = external receiver clock x 16

0 0 0 1 = 50 bps

0 0 1 0 = 75 bps

0 0 1 1 = 109.92 bps

0 1 0 0 = 134.58 bps

0 1 0 1 = 150 bps

0 1 1 0 = 300 bps

0 1 1 1 = 600 bps

1 0 0 0 = 1200 bps

1 0 0 1 = 1800 bps

1 0 1 0 = 2400 bps

1 0 1 1 = 3600 bps

1 1 0 0 = 4800 bps

1 1 0 1 = 7200 bps

1 1 1 0 = 9600 bps

1 1 1 1 = 19200 bps

CMNDREG ($C08A + $n0) (read/write)

765 - parity generator

- - 0 = parity disabled, parity check disabled

0 0 1 = odd parity

0 1 1 = even parity

1 0 1 = mark parity, parity check disabled

1 1 1 = space parity, parity check disabled

4 - normal/echo mode for receiver

0 = normal

1 = echo all received characters

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 488 of 572

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