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Re: MegaST ROM adapter - black screen
Posted: 30 Jan 2024 15:55
by rubber_jonnie
Badwolf wrote: 30 Jan 2024 13:41
HigashiJun wrote: 29 Jan 2024 09:44
Oh, and BTW, may we know which TOS version you're trying to run ?
If you want TOS 2.06, then you also need a TOS decoder to make it work.
There are four chips.
Two have TOS1.04UK/EmuTOSUK 192k in them. One has EmuTOSPL and Tos1.04UK in it.
These three chips have been tested in my STFM.
The last chip has TOS2.06 and EmuTOS256 in it. I've suggested to Arti changing the chip in case he's randomly picked the TOS2.06 version by accident (none are labelled, I figured it'd be obvious). I've also suggested trying the chips in his STFM, which is known to work. Not heard back.
BW
Thanks BW :)
Re: MegaST ROM adapter - black screen
Posted: 30 Jan 2024 20:17
by HigashiJun
Thank you @Badwolf.
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 11:38
by arti040
st-001.jpg
st-002.jpg
st-003.jpg
st-004.jpg
st-005.jpg
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 11:43
by HigashiJun
Is the yellow capacitor soldered on one side only ?
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 11:45
by HigashiJun
@Badwolf
When did you burn the EPROM for @arti040 ?
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 12:06
by arti040
HigashiJun wrote: 02 Feb 2024 11:43
Is the yellow capacitor soldered on one side only ?
Yup. As in the documentation.
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 12:09
by stephen_usher
It's only a decoupling cap but that's the point of it being there if it's only connected on one side?
It shouldn't make any real difference but it should be soldered each end.
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 12:16
by arti040
Ouch, I misunderstood the question. Of course, it is soldered from both sides! :-)
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 13:56
by rubber_jonnie
OK, so looking at the bottom I can see two solder joints that don't look right, shown by the arrows:
st-005_RJ.jpg
The top one looks like it has bridged across to ground, and the bottom looks like it is a cold or incomplete joint.
I'd still suggest that you need to change the jumper header to a square pin type as those round pins won't make good contact through that jumper, they are too small.
Re: MegaST ROM adapter - black screen
Posted: 02 Feb 2024 22:43
by Badwolf
HigashiJun wrote: 02 Feb 2024 11:45
@Badwolf
When did you burn the EPROM for @arti040 ?
Start of January. It's not EPROM bitrot. I'm still using uncovered EPROMS from two years ago.
What I would suggest is putting the EPROM in the dualtos-equipped STFM I know Arti has to check the ROM is working and is the right one!
BW