Where will the devices be sold? Could you please announce it here, when there is new information.
Best regards
Search found 21 matches
- Sat Nov 04, 2023 5:13 pm
- Forum: WANTED
- Topic: UDG 4 ZXpand
- Replies: 4
- Views: 7269
- Wed Oct 25, 2023 4:52 pm
- Forum: WANTED
- Topic: UDG 4 ZXpand
- Replies: 4
- Views: 7269
UDG 4 ZXpand
Any hints where to get one of these?
Best regards
Best regards
- Sat Jun 17, 2023 8:35 pm
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882
Re: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
The original ULA was DOA and has been replaced. Here is a pic of the bottom of the dead ULA. The top is glued to the heatsink forever.
[attachment=0]IMG_9383.jpeg[/attachment
[attachment=0]IMG_9383.jpeg[/attachment
- Sat Jun 17, 2023 3:20 pm
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882
Re: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
Maybe i will go back to 16k mod. But my goal was to have 32k with WRX possible.
For today i will give up. Thanks for your advice.
For today i will give up. Thanks for your advice.
- Sat Jun 17, 2023 2:18 pm
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882
Re: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
Corrected to pF which i used. I have not used nF caps.
I checked my other mod and post a picture below. Here i us a 100 pF cap. The result is a correct display of WRX graphics.
I checked my other mod and post a picture below. Here i us a 100 pF cap. The result is a correct display of WRX graphics.
- Sat Jun 17, 2023 1:35 pm
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882
Re: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
Do you mean 100 nF is still to high, or over 300 nF. When I tried 10 - 100, always the same result / pic1.
I did a 16k mod on another machine with the same SRAM chip. Here the WRX hires works regular, so i thaught the problem would be the additional 32 k / 7400 part.
I did a 16k mod on another machine with the same SRAM chip. Here the WRX hires works regular, so i thaught the problem would be the additional 32 k / 7400 part.
- Sat Jun 17, 2023 11:49 am
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882
Re: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
OR Pin 20 in the socket. Only a capacitor should connect to here. This pin must NOT be connected to 0V/GND. Pin 22 lifted and wired to pin 14 (which is 0V/GND). This is exactly my wiring. I tried some caps. Up to 100 pF ( nF ) i get the first result, 200 / 300 pF (nF) make second pic. Higher nFs ke...
- Sat Jun 17, 2023 9:48 am
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882
Re: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
Am i right Pin 22 lifted up -> GND
Pin 20 in socket -> GND
doenst work an results in this screen.
Pin 20 in socket -> GND
doenst work an results in this screen.
- Fri Jun 16, 2023 10:14 pm
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882
Re: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
Maybe this can help. The schematic of the mod and an older picture showing the wiring. I tested putting the cap between the red marked pins. Here is a detailed description of the mod. http://www.8bit-homecomputermuseum.at/repair/zx81%2032k%20intern/zx81_32k_intern.html Normal progams, for example 3D...
- Fri Jun 16, 2023 5:57 pm
- Forum: Hardware
- Topic: Internal 16K RAM mod doesn’t quite work with Dr Beep hires games
- Replies: 56
- Views: 5882