FIles in the firmware ROMs V5.21E & 7.11c

A project log for Re-UD-80 - a larger display for Epson PX-4 / PX-8

The vintage Epson PX-4 and PX-8 computers have small LCD screens, with low contrast. This device fixes that problem.

fjkraanfjkraan 04/04/2024 at 12:250 Comments

The Filink file set of the V5.21E are:

The Filink file set of the V7.11c are:

This suggests V5.21E is intendend for the PX-8 and V7.11c is for the PX-4. The two WSX.COM files are different, which is then expected. But the IRM.COM will not run on a PX-4, as it complains it needs a newer OS-ROM, M25030CB. But this ROM is for the PX-8, not the PX-4. The IRM.COM needs 25 pages of User-BIOS. Text in the file refers to the DS-8.

AFAIK, there is no Portable WordStar for the PX-4. The internal version numbers are different, so both are mostlikely for the PX-8.

The PIN-DRV.COM seems to execute without error on the PX-4 (assuming 4 User-BIOS pages), but does not reroute the console to the UD-80. 'Pine' is the internal name for the PX-4 board. The PX-8 is 'Maple'.

(The 7.11c version is a patch from the original 7.11A, so it works with the Re-UD-80. Otherwise they are identical. the bytes changed are the EF9345 register setting, the banner text and the checksum)