Corroded 286 Part 2. Can I fix the CMOS backup and Floppy Drive DMA problems ?
#retro #dosgames #repair
Following on from Ep 1 when I managed to get this MG Headland 286 motherboard to post I continue with the repairs and work on the Keyboard circuit before a lot more testing and some very interesting problems.
EP.1 • Mystery 286 PC motherboard with battery da...
If you want a lot more information look at the tread over at Vogons
https://www.vogons.org/viewtopic.php?...
or my github for the LA files.
https://github.com/midicdj1000/headla...
I also tested a sound card that uses DMA and that does not work. Without sound Wolf3d will run for hours with no faults, but once installed a sound card and use DMA it started to get buggy and eventually crash, on top of this no digital sounds worked in any game or in the sound card test programs so the DMA is not limited to Floppy access.
Thumbnail is from @JamesOGradyWhatHoSnorkers
/ jamesogradywhathosnorkers
Go and watch his channel if you like retro games especially type in games when he fixes bugs or adds new parts with lots of cosplay, So much fun .
00:00 intro
00:30 fixing the keyboard circuit
02:30 basic testing of the 286 board
06:28 trying a Floppy - IDE - Serial card
10:17 looking at all the bodge wires
15:33 using the Logic Analyzer to look deeper at the Floppy reading problems
20:25 A closer look at the LA Data
24:13 Testing the Floppy drive and controller on a Pentium.
25:41 conclusion - The 286 says NO floppy disc for you.