R. Stricklin says:
|OSC 14.7456 MHz osc
P1 3 ports
U2 Intel 80C51BH1
|U21 AMD Z8530APC
U64 NEC D8237AC-5
The 08F3207 is the "RT PC Multiprotocol
Adapter". It has two asynchronous serial ports (RS-232C on the 16-pin
connectors) and one synchronous serial port (X.21 on the 14-pin
connector). I thought I had information about cable pinouts, but I
can't find it right now. I will write back if I locate it.
Rick Ekblaw writes:
P1 has 2 16-pin (2x8) ports (top two), then the "bottom"
port nearest C28
has 13 pins (2x7 with one pin missing - the middle pin in the second
row). The connector is not labeled, so P1 is as good a designator