12 Aug
2005
12 Aug
'05
7:03 p.m.
On Sat, 13 Aug 2005, Tony Duell wrote:
That's what they look like to me (looking at the photo in the manual).
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That sounds like the bit-banger card. I have a couple,
I have the manual
somewhere. I've also heard that one early Apple manual (which I don't
have) contains code to bit-bang 110 baud serial data through one of the
outputs on the games connector, and that that was the original way to get
printouts from an Apple (convert to current loop, add an ASR33).
This is in the first Apple II Reference Manual (a.k.a. the "Red Book",
January 1978), which was the manual you got with your Apple ][ prior to
the more "official" small format spiral bound Apple ][ Reference Manual.
It's on page 114, "A Simple Serial Ouput", and includes an assembly
listing and schematics for a simple circuit that plugs into the game port.
It's a hard to find manual and sells for a lot when it is found.
As I said, it
has no chips larger than the 14 or 16 pin packages IIRC.
I thought the firmware ROMs (there are 2 on the bitbanger, P7 and P8)
were 20 pin chips.