[EMAIL PROTECTED] makes some magical things to make me read } } > I'm going to reverse the Q40 2.91 eprom code to try to understand what's wrong with my home-made new 3.01 eprom... unless someone came with a working solution, } > that is. Something must be different... somewhere! } Sned it to me, I can have a look at it.
I will think of that (but it's basically a 3.01, excepted for a minor personal correction about mode8 mask convertion, totally irrelevant I believe for the booting problem). And the strangest part is: when "lrespr"-ed, it works fine! Only when eproms-programmed, it does not move (well, not too far: I hear the disk start, but nothing move after a few 'cl/cl/cl') } } perhaps it would be better to make a special version of the OS that } prints something on the screen at each module? } That way, you can find out where the problem lies. The only problem: how do you 'print' when there is no initialised hardware yet (as well as no system) ? That's an idea to follow anyway, but the 'additional code' must fit in the short space which currently remains on the eprom. (about 5K)...ok assembly does not have to be so big anyway. May be I could use the parallel-printer port to print (have to look how to send a caractere to that interface... hopefully it's simple. Or using a serial port (if I connect a serial printer to it). Or I could just 'paint' the screen memory.( fixed address, but resolution might be variable) But I'm afraid I'm not going to code a character generator for debugging purpose(no, no return to the zx81 era, thanks). Ok, back to the hardware booklet then, with the dea-manual too --
