Multitech Microprofessor MPF-1

[PhilipA]

I've had this for a long while, probably around 1998 I got it, didn't know anything about it back then and couldn't find any information about it.
Going through college part of one course was working in assembly, to learn how to repair electronic boards.

It is marked with Multitech, and MPF-1 PB8200110-5A (and it's missing the CTC which I'm going to get on order) but the ROMs are marked OLS 1/3 and L2.
Booting it up, the screen displays OLS L2, pulling the L2 ROM changes that to OLS L1.
Other than that it appears to operate in the same way as per the MPF-1 manual, though the ROM check code fails as the checksum isn't zero.

Has anyone seen one of these with this OLS (does antibody know what it even stands for?) ROM set?

Thanks
Phil

 

[PhilipA]

Just went chase the code a little. The original uPF--1 boot sequence code is present in the ROM but instead of the init there's a call out to a different location.

If I drop the PC in at 03C1 and run the code from there, it scrolls the uPF--1 across the screen then halts.

Phil