[HP-71B], FRAM71: putting an end to feature creep

[J-F Garnier]

(05-06-2014 07:38 PM)Hans Brueggemann Wrote:  what do you think of having a UART on FRAM71 ? does it make any sense at all?

I've always been reluctant to directly connect external electrical signals to the HP-71B. This machine is quite ESD sensitive and I don't like the idea to damage something. HP-IL is much safer for interfacing.

On the other hand the IR option looks nice, if it is a simple addition.
Like the others, I think the most important is the memory!

Quote: does somebody have the PIRLEX file and is willing to send it to me?

Extracted from the HHC'89 conference, here is a description of an IR module proto for the HP-71B made in the HP labs by Bruce Stevens, with the electrical schematic and the PIRLEX source listing:
HP-71B IR interface

Waiting for the FRAM71!

J-F