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At this time, it is unfortunately not possible to whitelist users when your IP changes constantly.
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D5 comes in at the bottom of the image (red track) then connects to the other chip above via a green track (inner layer). The green track connects to the MMU.. So there's a break somewhere around that via to the top red pad
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New bodge wire..
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...and...
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I may just unsolder all chips to see if I can see what the hell is going on..
Maybe I should just "retire" this board at this point...
OK so I removed the chips.. as suspected.. vias look totally missing in various places Not simple to fix without loads of bodge wires.. even so.. it wouldn't be much use for a dev board if its going to be "fragile".
I will have to see if the inner tracks are all connected.. maybe I could get lucky and just plaster solder in the hole...
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IMG_4235.JPG (442.15 KiB) Viewed 338 times
EDIT:
A quick test around, and it looks like its the "top side" part of the via which is missing from connection to top copper.. So the "good" news, is the middle copper layers seem to be connected. But with the vias being 0.2mm dia, id need some very tiny wire to reconnect the vias up.. assuming I could even get a wire though the hole in the first place, which I doubt ...
My new scope come.. annoyed within the first 2 minutes of using it ! This can't be a "feature" surely ?! Its a bug in my view ! The old scope never used to behave like that !!
exxos wrote: Fri Jan 16, 2026 3:30 pm
My new scope come.. annoyed within the first 2 minutes of using it ! This can't be a "feature" surely ?! Its a bug in my view ! The old scope never used to behave like that !!
Could it be a trace persistence issue?
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
( I haven't)