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go4retro / TurboMaster

Reverse Engineering of the Schnedler Systems 4MHz TurboMaster accelerator cartridge for the Commodore 64
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layout discrepancies #1

Open bwack opened 4 years ago

bwack commented 4 years ago

Top side: image

  1. IC14: original board has a cut trace. looks like a desoldering mistake not a factory bodge.
  2. IC7 (?) missing trace

Bottom side: image

  1. trace is touching via, and too close to one below
  2. trace is touching via
go4retro commented 4 years ago

I verified #1 is a cut I made while desoldering the PCB

2 is an omission, but did not show as unrouted, because the bottom side is also connected to GND, along with pin #6, which is connected on top side.

3/#4: I placed higher resolution Top and Bottom images into the ref dir, as these are not touching on the actual PCB artwork, so 300 DPI must not be fine enough to show that. The new images are 600 DPI.

Thanks for looking at it. If I may ask, how did you overlay the images, as it looks like it made quick work of it.

Jim

bwack commented 4 years ago

No problem. Regarding the traces that seemed to be touching, when i zoomed in on the artwork from eagle (in the paint.net file), it looked like there was a trace going into the vias where they were very close. could be a optical/digital effect of low resolution.

I took the paint.net file, then changed color from white to yellow on the eagle-layouts layer, then changed layer mode to "Lighten" and opacity to about 50%. I have experience from reverseengineering the KU-motherboard and TheChessCart.

go4retro commented 4 years ago

I added the 600 DPI artwork into the Paint.NET file and placed copies in the ref directory. I'll make the changes you note, as I was turning on/off the layer to do the check.

Jim