Search found 191 matches
- Mon May 20, 2024 9:01 am
- Forum: Hardware
- Topic: Problem after installing minerva
- Replies: 12
- Views: 287
Re: Problem after installing minerva
I think a ram fault… even if I well remember the minerva rom test the ram and display location of bad memory, but in this case probably the bad ram is the video ram
- Sat May 04, 2024 12:03 pm
- Forum: Hardware
- Topic: SOLVED !! who is willing to program 5 x hermes for me in eu
- Replies: 4
- Views: 409
Re: who is willing to program 5 x hermes for me in eu
Hi mate, I've an eeprom programmer and an Hermes so if you want, I can make that job for you; I'm in Italy near Rome. The only problem is that I cannot test the programmed chips because my QL doesn't work... I've burned the ZX8301
Let me know
Paolo
Let me know
Paolo
- Sun Nov 24, 2019 9:01 am
- Forum: Hardware
- Topic: Issue 6 board updates
- Replies: 105
- Views: 62816
Re: Issue 6 board updates
wow, great work, amazing !
Bravo
Bravo
- Sun Mar 17, 2019 4:35 pm
- Forum: Hardware
- Topic: QL test points...
- Replies: 19
- Views: 13203
Re: QL test points...
Me too!
- Sat Feb 09, 2019 8:40 pm
- Forum: Hardware
- Topic: Scart to vga or hdmi
- Replies: 2
- Views: 2030
Re: Scart to vga or hdmi
Hi, try to use search bar, we have discussed this some times ago.
Re: LM7805 3A
Yes of course, there’s no problem to use it, in effect I have changed regulator into my QL with a switching one with 3.5 amps capability.
Re: VGA BOX
yes is true! see this picture: http://www.fruitcake.plus.com/Sinclair/ ... ableQL.htm
Re: VGA BOX
It’s possible because the video signals from that ULA are direct and not protected to rgb socket! If you have some experience with soldering you can attach some zener diodes to protect output pins.
- Sun Sep 23, 2018 7:08 pm
- Forum: Hardware
- Topic: QL wont work
- Replies: 15
- Views: 8632
Re: QL wont work
D26 is the diode that bring negative rail to -12 volt regulator ic so is it possible that you have checked the ac voltage that feed power supply; try check the c40 condensator if it has 0 and -12 volt, but in effect that voltage is needed only for rs232 ports so is not the main problem ....
- Sat Sep 22, 2018 2:16 pm
- Forum: Hardware
- Topic: QL wont work
- Replies: 15
- Views: 8632
Re: QL wont work
Hi, on the voltage regulator you must have 9-10 volt on right pin that is the output voltage of transformer and 5 volt on left pin to drive all chips on motherboard, also you can check pin 14 of video driver chip ( the one below modulator) where you must have 12 volt.