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by rubber_jonnie
Thu Mar 28, 2024 3:05 pm
Forum: 8 BIT CORNER
Topic: OSI 600D Superboard Build
Replies: 317
Views: 55299

Re: OSI 600D Superboard Build

stephen_usher wrote: Thu Mar 28, 2024 2:59 pm Oh, so marginal timings... What fun.
Indeed...
by rubber_jonnie
Thu Mar 28, 2024 2:16 pm
Forum: 8 BIT CORNER
Topic: OSI 600D Superboard Build
Replies: 317
Views: 55299

Re: OSI 600D Superboard Build

OK, so it's fixed. IMG20240328134336.jpg The solution? I replaced the 74LS04 at U21 with a 74S04. According to the build doc I have it should be an an LS, but as soon as I swapped it out, the problem went away. I then looked at other schematics and BoMs and all state an LS04. I tried a bunch of LS04...
by rubber_jonnie
Thu Mar 28, 2024 11:13 am
Forum: HARDWARE DISCUSSIONS
Topic: 12V needed for ST?
Replies: 7
Views: 174

Re: 12V needed for ST?

I usually use a VGA adapter for all my testing so the 12v for SCART isn't required Colour mode? Or perhaps you just have a different VGA adapter to me (exxos' reduced cost version)? Cheers all. BW Whilst I did recently get a VGA adaptor from exxos , I've not tried it with just a 5v setup, but I did...
by rubber_jonnie
Thu Mar 28, 2024 10:14 am
Forum: MEMBER BLOGS
Topic: General Stuff(tm)
Replies: 1700
Views: 323179

Re: General Stuff(tm)

stephen_usher wrote: Thu Mar 28, 2024 8:29 am Looks like the pads are at the local Royal Mail delivery office.
:girldance:
by rubber_jonnie
Thu Mar 28, 2024 10:12 am
Forum: HARDWARE DISCUSSIONS
Topic: 12V needed for ST?
Replies: 7
Views: 174

Re: 12V needed for ST?

Aside from what has been said by the others, which is all good info, yes you can boot to desktop using just 5v.

I usually use a VGA adapter for all my testing so the 12v for SCART isn't required, though if I need to use the serial port for diagnostics I hook up the 12v too, as I have 2 bench PSUs.
by rubber_jonnie
Wed Mar 27, 2024 3:41 pm
Forum: HARDWARE ISSUES
Topic: No clock signal to the Shifter
Replies: 24
Views: 724

Re: No clock signal to the Shifter

With respect to the possibility of using either 2 or 6 chip TOS on this type of board I noticed something that got my attention. On the original 520ST schematic pin 22 OE of the TOS Roms is connected to UDS and LDS and also to the cartridge port. However, on the schematic for the 1040ST the TOS Rom...
by rubber_jonnie
Wed Mar 27, 2024 3:38 pm
Forum: MEMBER BLOGS
Topic: Stuff and Things.
Replies: 1495
Views: 364908

Re: Stuff and Things.

Yeah, seems like it's lost its capacitance a bit. :-) I have loads and loads of capacitors... mostly due to the one I need always being one I don't have. Either the capacitance is wrong or the voltage or the size. I know what you mean. I have a ton of caps, but none are the 10uF 250v variety, so ye...
by rubber_jonnie
Wed Mar 27, 2024 3:35 pm
Forum: MEMBER BLOGS
Topic: Neo Geo - Of the Pocket variety
Replies: 2
Views: 41

Re: Neo Geo - Of the Pocket variety

stephen_usher wrote: Wed Mar 27, 2024 3:07 pm I was going to say that the screen looked nice and crisp. Obviously that's due to your lighting conditions.
Yep that was taken on my workbench in optimum lighting conditions. In good light, the screen is nice, but move somewhere darker and it's not great.
by rubber_jonnie
Wed Mar 27, 2024 2:31 pm
Forum: MEMBER BLOGS
Topic: Neo Geo - Of the Pocket variety
Replies: 2
Views: 41

Neo Geo - Of the Pocket variety

I've always liked the look of the Neo Geo Pocket Colour, and being a handheld fan I decided it was time to have one join my collection: IMG20240327132546.jpg It came in the box, which was nice and I've picked up a RetroHQ SD cart solution, which is great because I can flash multiple games and easily...
by rubber_jonnie
Wed Mar 27, 2024 2:21 pm
Forum: MEMBER BLOGS
Topic: Stuff and Things.
Replies: 1495
Views: 364908

Re: Stuff and Things.

And to add to the story of the workbench magnifier light, parts came today, but it didn't fix it, so I checked the two main caps just to see what was what. Turned out the cap that I found with a loose leg, was no longer 10uF: IMG20240327132238.jpg So I've ordered some caps, but if that doesn't work,...

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