On 19 Nov 2003 at 12:53, Jerome Grimbert wrote: (...) > 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')
Aha, so it does get somewhere, then... (...) > The only problem: how do you 'print' when there is no initialised hardware yet (as > > well as no system) ? you don't, of course. However, nothing stops you from painting white blocks on the screen by writing to the screen memory directly. > 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. yup. > 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) Yes, that's the way to go. You can even do that first in the lrespr'd mode, to see what resolution you are at. > 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 If you want some help, let me know. Wolfgang
