12 Aug
2005
12 Aug
'05
11:12 p.m.
On 8/12/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
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).
I've done that (bit-banger serial over the game port) with non-Apple
software at 1200 baud direct to a C-64 user-port bit-banger serial
port... was about 1984 or 1985... me and a mate wrote some custom
stuff to gulp and blow disk sectors from the Apple II version of
Sorcerer to a C-64 disk that had formerly contained Enchanter. We
used Enchanter to map the different sector mappings, then siphoned off
the game file from one machine to the other, proving beyond a shadow
of a doubt that Infocom's multi-platform efforts were fully
successful. The game-port-to-user-port hack wasn't bad, either. No
level shifters, just TTL serial over a 30 cm twisted triple-wire (RxD,
TxD, GND).
I thought the firmware ROMs (there are 2 on the
bitbanger, P7 and P8)
were 20 pin chips.
They should be 6309s, but I could be mistaken.
-ethan