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: 1746

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: 1746

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: 1746

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: 1746

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: 6650

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: 6871

Re: ZX80 RAM PACK DIY clone

Awesome work - and looks pretty good! :D

Hope these pics help:
803.JPG
803.JPG (27.49 KiB) Viewed 1996 times
802.JPG
802.JPG (33.23 KiB) Viewed 1996 times
801.JPG
801.JPG (65.15 KiB) Viewed 1996 times
by Fwapp
Mon May 29, 2017 10:28 am
Forum: SALES
Topic: ZXpand+ ... 3.. 2.. 1..
Replies: 66
Views: 14606

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: 192
Views: 29614

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: 192
Views: 29614

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: 1421

Re: WANTED: Reversi - Sinclair Research Tape

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