Search found 59 matches

by IanB
Mon Aug 31, 2015 12:10 am
Forum: Software
Topic: Calling in some help?
Replies: 5
Views: 1056

Re: Calling in some help?

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

God help me with somebody else's!
by IanB
Sun Aug 30, 2015 8:20 pm
Forum: Development
Topic: Setting Slow And Fast Mode From Machine Code
Replies: 4
Views: 551

Re: Setting Slow And Fast Mode From Machine Code

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 :)
by IanB
Sun Aug 30, 2015 7:28 pm
Forum: Software
Topic: Calling in some help?
Replies: 5
Views: 1056

Re: Calling in some help?

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.
by IanB
Sun Aug 30, 2015 1:55 pm
Forum: Software
Topic: Calling in some help?
Replies: 5
Views: 1056

Re: Calling in some help?

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...
by IanB
Sun Aug 30, 2015 1:35 pm
Forum: Development
Topic: Setting Slow And Fast Mode From Machine Code
Replies: 4
Views: 551

Setting Slow And Fast Mode From Machine Code

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...
by IanB
Thu Aug 27, 2015 11:18 pm
Forum: Development
Topic: ZXmore or the ZX80CORE follow-up
Replies: 264
Views: 18085

Re: ZXmore or the ZX80CORE follow-up

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.
by IanB
Wed Aug 26, 2015 5:07 pm
Forum: Hardware
Topic: Trying to restart a 33 years old ZX81 [SOLVED]
Replies: 54
Views: 4019

Re: Trying to restart a 33 years old ZX81 [SOLVED]

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 :)
by IanB
Wed Aug 26, 2015 4:25 pm
Forum: Hardware
Topic: Trying to restart a 33 years old ZX81 [SOLVED]
Replies: 54
Views: 4019

Re: Trying to restart a 33 years old ZX81 [SOLVED]

I wasn't. I was really not pleased at all. :)
by IanB
Wed Aug 26, 2015 12:29 pm
Forum: Hardware
Topic: Trying to restart a 33 years old ZX81 [SOLVED]
Replies: 54
Views: 4019

Re: Trying to restart a 33 years old ZX81

Congratulations! Regarding the Memotech HRG, I bought one and remember being thoroughly disappointed. It came with a set of ROM routines for plotting, drawing lines, etc, but they were so hopelessly, orders of magnitude slow that it was clear that there was no use for them at all. I was a machine co...