Search found 77 matches

by albertusj
Mon Jul 15, 2019 4:54 pm
Forum: Hardware
Topic: EPROM models for 8K ZX80 ROM
Replies: 2
Views: 1907

Re: EPROM models for 8K ZX80 ROM

Mutant Caterpillar is going to do some for me.
by albertusj
Mon Jul 15, 2019 1:00 pm
Forum: Hardware
Topic: Jailbars on ZX80
Replies: 4
Views: 2583

Re: Jailbars on ZX80

Thanks as always 1024! I'll try your suggestions.
by albertusj
Sun Jul 14, 2019 1:07 pm
Forum: Hardware
Topic: EPROM models for 8K ZX80 ROM
Replies: 2
Views: 1907

EPROM models for 8K ZX80 ROM

Possible dumb question,

I'd like to have an 8K BASIC ROM burned for my ZX80. What model EPROM should I ask for? 2364 or pin-compatible modern replacement?
by albertusj
Sun Jul 14, 2019 12:41 pm
Forum: WANTED
Topic: 8K BASIC ROM for ZX80
Replies: 6
Views: 7317

Re: 8K BASIC ROM for ZX80

Lardo Boffin wrote: Tue Jul 09, 2019 8:02 pm Mutant Caterpillar Games may be able to help.

http://www.mutant-caterpillar.co.uk/
Thanks
by albertusj
Sun Jul 14, 2019 12:40 pm
Forum: Hardware
Topic: Jailbars on ZX80
Replies: 4
Views: 2583

Re: Jailbars on ZX80

Strategically placed 100nF capacitors over the power rails of U9 and U20 made for some improvement. :D
by albertusj
Sat Jul 13, 2019 7:27 pm
Forum: Hardware
Topic: Identifying Board Version
Replies: 3
Views: 4197

Re: Identifying Board Version

Thank you
by albertusj
Sat Jul 13, 2019 7:22 pm
Forum: Hardware
Topic: Jailbars on ZX80
Replies: 4
Views: 2583

Jailbars on ZX80

Does anyone have any suggestions on how I can eliminate or reduce the "jail bar" effect present on my ZX80s composite output?

http://www.myprius.co.za/jailbar.JPG
by albertusj
Sat Jul 13, 2019 6:57 pm
Forum: Hardware
Topic: Interference in Composite
Replies: 3
Views: 3532

Re: Interference in Composite

Could you please help and point me to a schematic so I can see which components you refer to? Thank you for all your help. :geek:
by albertusj
Sat Jul 13, 2019 5:36 pm
Forum: Hardware
Topic: Data interface on ZX
Replies: 2
Views: 2766

Re: Data interface on ZX

I was actually gifted recently three or four 8250 UARTs. Could they be useful?

I can program an Arduino to do conversion too. I was just looking for ideas. Thanks 1024!
by albertusj
Sat Jul 13, 2019 5:32 pm
Forum: Hardware
Topic: Interference in Composite
Replies: 3
Views: 3532

Interference in Composite

Hi, I made a plugin adapter to tap the composite video signal from the PCB edge connector on my Spectrum. I got video, but there is a herringbone type interference and like a speckle noise. I figured it might be because the modulator was still active so I snipped its power line, but still, the compo...