8-bit acorn hardware • Re: Music 500 -> Music 5000 and Music 500 -> Music 3000

That's an excellent resource, thanks! I scoped out the "good" and "bad" M5000 and yup, D0 is different and that drives data input to the flip-flop that in turn with ADDR0 drives the "mute" circuitry.

I wonder if the Wave RAM writes from the host are somehow getting corrupted.

Are you testing on a Master or a Model B?

It might be worth confirming the "bad" M5000 fails on both machines.

Also, has this been modded for Master use? Double check the correct R/C values have been used.

Dave

I was testing on a rather tortured (the nice Flash/SRAM board guinea pig) BBC Model B disc/Econet. I tried another couple of Beebs that I just got working (repair threads for those two!) and they performed exactly the same. I dug out the Master and tried that, after lots of aggro with GoSDC, Master RAM/ROM cartridges and ANFS 4.25 I ended up burning an EPROM and putting it in the ROM socket on the cartridge. Solved all that aggro and ended up, yup, exactly the same. So on the plus side, all the M5000's in a chain perform exactly the same as they did on any Beeb and the Master. The mod is a couple of track cuts and a bodge wire, a 470R resistor and a 220pF capacitor.

Statistics: Posted by maniacminer — Wed Apr 17, 2024 12:40 am

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