Apple II hardware design

From: Sam Ismail <dastar_at_crl.com>
Date: Mon Jun 23 11:31:43 1997

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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Computer Historian, Programmer, Musician, Philosopher, Athlete, Writer, Jackass
Received on Mon Jun 23 1997 - 11:31:43 BST