Search found 133 matches

by poglad
Fri Jun 20, 2014 10:31 am
Forum: Hardware
Topic: Query on a Issue 1 ZX81
Replies: 34
Views: 14738

Re: Query on a Issue 1 ZX81

GCHarder wrote:I read this article by Dr. Logan from Sinclair User just last night, pretty fortuitous! It explains that add-on board nicely.
The first two (were there more than two?) Sinclair User annuals were superb. I have them both in a box somewhere, it was an exciting part of Christmas to get them! :)
by poglad
Thu Jun 19, 2014 5:20 pm
Forum: Sinclair Misc
Topic: ZX81 upgrade for ZX80
Replies: 7
Views: 2407

Re: ZX81 upgrade for ZX80

Ah... the days when Sinclair magazines actually contained some real meat. :)
by poglad
Thu Jun 19, 2014 12:03 am
Forum: Sinclair Misc
Topic: ZX81 upgrade for ZX80
Replies: 7
Views: 2407

Re: ZX81 upgrade for ZX80

No idea, sorry. What kind of material is the keyboard overlay made out of? Is it just paper?
by poglad
Thu Jun 12, 2014 10:33 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 75474

Re: ZX80 Core - new ZX80 motherboards

Thanks Karl, looking forward to giving it a go! :)
by poglad
Thu Jun 12, 2014 9:28 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 75474

Re: ZX80 Core - new ZX80 motherboards

It is different. On the 28C256 it's $5555 rather than $1555. No idea whether it write protects again, but there seem to be no options for sending these codes through the GQ USB software, unfortunately.
by poglad
Thu Jun 12, 2014 5:50 pm
Forum: ZX BASIC
Topic: ZX80core LED fun
Replies: 1
Views: 2348

ZX80core LED fun

Here's something I discovered last night. You need to run it in SLOW mode (i.e. with NMI board attached) on a ZX80core with the illumination kit, using the ZX81 ROM image. Oh, and make sure you don't have a printer attached! 10 LLIST 20 GOTO 10 Rather superbly, this results in a shimmering, very pal...
by poglad
Wed Jun 11, 2014 10:59 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 75474

Re: ZX80 Core - new ZX80 motherboards

I've determined the cause of my final problem. Here are my steps - using only ZX80 images in each position so that I can change the ROM switch without it crashing. 1. Start in position 4 - ZX80 image, write protected. 2. Boots up successfully. 3. Carefully change switch to position 0 - ZX80 image, n...
by poglad
Mon Jun 09, 2014 11:31 am
Forum: ZX BASIC
Topic: Random maze generator.
Replies: 9
Views: 5924

Re: Random maze generator.

Back on topic, the Maze Generator... Here is a Maze Generator for the ZX80, written by... Nigel Searle. Remember him?

10 PRINT CHR$(RND(3));
20 GO TO 10

It appeared in Sync magazine back in 1980:
https://archive.org/stream/syncmagazine ... 2/mode/1up
by poglad
Mon Jun 09, 2014 11:26 am
Forum: ZX BASIC
Topic: Random maze generator.
Replies: 9
Views: 5924

Re: Random maze generator.

...or execute 24 SCROLLs one after the other. Doing that before a SAVE will knock a few seconds off the loading time. I wonder why Vickers 'cheated' with the scroll routine and made it generate short lines? It's annoying because you end up with all sorts of screen flickering next time you do a CLS, ...
by poglad
Mon Jun 09, 2014 11:23 am
Forum: ZX BASIC
Topic: How To Test the screen memory...(The DF_CC Vs D_FILE)
Replies: 4
Views: 3685

Re: How To Test the screen memory...(The DF_CC Vs D_FILE)

I don't feel that the obfuscated style of coding really shows the ZX81 at its best, but to each their own!