MLDL2000 stopped working

[hth]

(08-11-2016 06:30 AM)Ángel Martin Wrote:  I'm a bit rusty but I don't remember anything about an MLDL operating system module - I sure don't have such a thing on my unit... ?

Mine came with one -MK2 ROM flashed into it. You can find it as a .rom file at http://hp41.kuiprs.nl/m2k_rom.rom

I restored it after erasing the flash.

Thinking about MLDL OS, I think everyone came with something like that. For my home built MLDL from around 1983 I stirred together one myself, mostly based on things found in various PPC journals, perhaps with some home brewed stuff as well. I do not remember as I have not looked at it for a long time. I considered dusting off that MLDL, but getting images from the computer into that one would be a lot tricker compared to the MLDL2000.

Back then, I used the parallel port on a Commodore 64, simulating the HP41 bus signals as fast as it could to download the fresh image into MLDL RAM, I think it took 35 seconds. Haha, and it was nothing compared to the poor Commodore 64 building modules, pulling the source in from 3 files from that super slow floppy drive it had. It just could not fit all the source code into memory all at once. The assembler was pretty fast though, as it was written in 6502 machine code, but that floppy drive took its time...