Search found 152 matches

by Fwapp
Sun Feb 17, 2019 11:26 pm
Forum: Hardware
Topic: ZX81 HDMI interface using Raspberry Pi Zero
Replies: 7
Views: 817

Re: ZX81 HDMI interface using Raspberry Pi Zero

Just a thought, but if you already have a ZX CCB or ZX Vid comp video pcb installed, would you be able to bypass the comparator circuit altogether, and feed the signal directly into the RGB to HDMI? No, if you are saying what I think you are saying. As I understand it, the PI needs separate video a...
by Fwapp
Sun Feb 17, 2019 11:45 am
Forum: Hardware
Topic: ZX81 HDMI interface using Raspberry Pi Zero
Replies: 7
Views: 817

Re: ZX81 HDMI interface using Raspberry Pi Zero

Just a thought, but if you already have a ZX CCB or ZX Vid comp video pcb installed, would you be able to bypass the comparator circuit altogether, and feed the signal directly into the RGB to HDMI?
by Fwapp
Sun Feb 17, 2019 10:42 am
Forum: Hardware
Topic: ZX81 HDMI interface using Raspberry Pi Zero
Replies: 7
Views: 817

Re: ZX81 HDMI interface using Raspberry Pi Zero

I pretty crap these days at conjuring circuits up, could you post a schematic of the little circuit required? I'd love to give this a try. I have the CPLD pcb on the way. This is the circuit on the veroboard in addition to the pcb that's plugged into the Pi zero: composite2rgb.jpg Perfect! Thanks f...
by Fwapp
Sat Feb 16, 2019 1:16 pm
Forum: Hardware
Topic: ZX81 HDMI interface using Raspberry Pi Zero
Replies: 7
Views: 817

Re: ZX81 HDMI interface using Raspberry Pi Zero

Very, very interesting!

I pretty crap these days at conjuring circuits up, could you post a schematic of the little circuit required? I'd love to give this a try. I have the CPLD pcb on the way.
by Fwapp
Tue Aug 28, 2018 11:08 pm
Forum: Development
Topic: A 15.999K Adventure game: The Valley of adventure.
Replies: 11
Views: 5703

Re: A 15.999K Adventure game: The Valley of adventure.

Hey Dave - I'd love to see what you've got related to The Valley. I tracked down a copy of Computing Today with the original PET listing in, but have yet to type it into my PET.
by Fwapp
Thu Jun 01, 2017 3:37 pm
Forum: Development
Topic: ZX80 RAM PACK DIY clone
Replies: 29
Views: 5108

Re: ZX80 RAM PACK DIY clone

Awesome work - and looks pretty good! :D

Hope these pics help:
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803.JPG (27.49 KiB) Viewed 1415 times
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802.JPG (33.23 KiB) Viewed 1415 times
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801.JPG (65.15 KiB) Viewed 1415 times
by Fwapp
Mon May 29, 2017 10:28 am
Forum: SALES
Topic: ZXpand+ ... 3.. 2.. 1..
Replies: 66
Views: 11321

Re: ZXpand+ ... 3.. 2.. 1..

I think new owners are going to be VERY happy with the ZXPand+ :D SirMorris was kind enough to send a ZXPand+ to me prior to last weekend. The reason being I was helping out on a mate's stall at the Revival retro event in Walsall, and being big ZX81 fans, we wanted to give it some exposure. We were ...
by Fwapp
Sat May 27, 2017 2:04 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 191
Views: 20721

Re: "Different" ZX81's

Wooo - nice!! The kludge fix ones are really nice to have in a collection. It amazes me that they could fix a software bug in the ROM by plonking hardware on the CPU - amazingly clever (at least from my point of view!) That sounds interesting. Any description / explanation of it somewhere? There's ...
by Fwapp
Sat May 27, 2017 11:42 am
Forum: Hardware
Topic: "Different" ZX81's
Replies: 191
Views: 20721

Re: "Different" ZX81's

Wooo - nice!! The kludge fix ones are really nice to have in a collection. It amazes me that they could fix a software bug in the ROM by plonking hardware on the CPU - amazingly clever (at least from my point of view!)
by Fwapp
Tue Apr 04, 2017 6:20 pm
Forum: WANTED
Topic: WANTED: Reversi - Sinclair Research Tape
Replies: 2
Views: 1096

Re: WANTED: Reversi - Sinclair Research Tape

Thanks, but I'm after the physical tape :)