HP-71B IL Module Version

[Dave Frederickson]

(01-27-2018 04:46 PM)Craig Bladow Wrote:  I purchased a bare chip, with firmware version 2.1, from Jean-Francois. Older schematics I used to wire my board showed SW1 and SW2 which in the latest hardware is JP2 and JP1 respectively. Per email from Jean-Francois SW1/JP2 is reserved for HP-71B IL modules versioin 1A which have a timing problem with the PIL-box. SW2/JP1 in my firmware version selects between 230 and 115 kbps.

Oh! I didn't know you made your own board, I thought you bought the kit. In equating the older schematic in this document,

http://www.jeffcalc.hp41.eu/hpil/files/ilser.pdf

JP1 is connected to the Serial I/O
JP2 is SW2
JP3 is SW1



JP2/SW2 is used to select the transfer rate. 115k with the JP2 installed or 230k with it removed if using the latest firmware, v2.1.

If JP3 is used for the 1A 71 IL module then that was not mentioned when beta testing the v2.1 firmware.

How does this affect use with the 41, the Portable's, Series 80, etc?