FRAM71 and RS-232

[J-F Garnier]

(02-07-2021 09:01 AM)Hans Brueggemann Wrote:  moons ago, I "upgraded" a 82164A internally with an USB232R serial-to-USB module. they seem to be obsolete now.

I'm using the same UB232R module in the PIL-Box, and to my knowledge they are still available, although my favourite distributors have low stock maybe due to the current global chip shortage.
Do you have precise information?

Quote:connections between the FTDI and 82164A's UART (Rockwell R6551AP) are just 4 wires: TX, RX, VDD, GND. supply from USB is sufficient, so no more need for the wall adapter.

leaving 82164A's configuration unchanged after power-up, the PC-side USB COM-port is configured as 9600 N8 1 XON/XOFF.
a PRINTER IS 1 and then printing "1234567890ABCDEF" in a loop yields about 410 Bytes / sec.

Without handshake, no problem to send data from HP71 to PC if the HP71 loop is slow enough, but handshake may be mandatory in the other direction PC -> HP71.

J-F