11 Aug
2005
11 Aug
'05
6:36 p.m.
Apple's official RS232 interface for the ][ used only level shifters from
TTL to +- 12. The 6502 would fiddle the levels and watch the control
lines in software.
If you have a controller with a UART on it, then it will need a driver
chip and may not be useful with some apple aps.
The card I have has a 12 or so pin ribbon cable actually fixed to
the board by a header, and it dangles thru the apple2 slot and is
clamped in place there by a metal bracket that pinches the cable
and the case to make a firm installation.
As I said, it has no chips larger than the 14 or 16 pin packages IIRC.
I ran some sort of terminal emulator on it at one time, and I remember
it had trouble over 1200 baud or so.
Jim
Tony Duell wrote:
Sellam mentioned that Apple ][ Comms card the other
day... Thinking I
should have one, I went digging in the depths of my workshop and found a
box of mostly Apple ][ cards. I am not really an Apple person, so perhaps
somebody sould tell me what I've found... All are Apple ][ plug-in cards
unless I state otherwise.