Sinclair ZX80 / ZX81 / Z88 Forums

I wonder why Sinclair never made a 2K model for the UK? 1K is so tricky to do much with, increasing to 2K would have been a dramatic difference and it's easy to see why the Timex model had 2K as standard. Probably because they expected virtually everyone to upgrade to 16K. You buy the 1K machine, i...

I'm currently up to my neck in flowcharts, and that's just for my own code.

God help me with somebody else's!

Yes I'm still working on 1k routines.

I just want this while I am testing my forthcoming routines to expand and contract the display file, and until they are optimised I don't want the ZX81 trying to display the screen before it is completed, and crashing

Thanks Andy

Have you considered learning to program? I'm not being facetious here; it's not hard once you get a start. You already understand computer organisation.

I'm currently spending all my time in the bowels of the ZX81, and my Spectrum programming is rusty. As a general point though, reading your intentions, I seriously wonder whether it would be easier to reverse engineer the program code- which probably effects fairly simple rules, then rewrite the eng...

I'm probably being a bit dimwitted (not unusual for me) but I can't seem to work out the right way to call the ROM to set Fast or Slow (er, "Compute And Display" :) ) mode from a machine code routine. There is 0207h which the Disassembly calls "Slow/Fast" and 02E7h which it calls "Set Fast Mode", bu...

Do you suggest me to connect the EAR output of the tape recorder to the MIC input of my sound card ?

Your sound card should have a line level input which will accomodate a line level signal.

I think there was an unofficial law in the 1980s that any 78/79 series regulator had to be overloaded, inadequately heatsinked, and preferably so badly mounted that either the pins would snap or it would tear the tracks off the circuit board. They must have been the most abused component in history

I wasn't. I was really not pleased at all.