23 Jun
1997
23 Jun
'97
4:31 a.m.
On 22 Jun 1997, Frank McConnell wrote:
If you look in the Apple ][ red book, there is a
little circuit
in there that plugs into the game I/O connector and drives a
20mA current loop. Alongside there is a short assembly program
to drive it. Now there is a bit-banger.
Woz designed a printer to work off of the internal I/O port.
There was an unspectacular serial card for the ][. I
don't recall it
being a bit banger, just that the combination of it and the printer I
was using at the time (an IDS BrighterWriter) wasn't smart enough to
manage any sort of common flow control, so that I had to run it at 300
baud. I thought it had some sort of UART-like thing, but maybe my
brain is going again.
I have that card. Its in my box o' apple peripherals. I thinks its just
generically named "Apple Serial Interface".
Sam
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