HP-75 - SRQ/interrupt and HPILCMDS.LEX?

[rprosperi]

(07-20-2016 11:22 AM)Paul Berger (Canada) Wrote:  The IO ROM also contains all of the commands in the HPILCMDS LEX, but the "LEX number" is different so if a BASIC program was written using the LEX it will not find the corresponding commands in the ROM. The easiest way around this is to convert the file to text with the LEX file loaded and convert back to BASIC with the LEX file removed and I/O ROM installed.

Thanks Paul for clarifying the differing 'LEX IDs', I had never considered this. When I first got my I/O ROM, I had this exact issue (program built with LEX file not working with ROM) and assumed something was simply not working right and abandoned it. As a 71B guy, I frequently run into brick walls on the 75C, and usually assume the limitation is just my lack of 75C knowledge. Today, I don't even recall what I was trying to do, but this explains what happened.