8-bit acorn hardware • BBC mode 0 to 6 RAM problems

Hi All

I have a BBC B that works fine in teletex mode7 and sometimes has extra characters on screen when first booted but CTRL-BREAK clears them.

However all other modes generate pixelated screen garbage.

I've used 3 test ROM's (Tricky's, Andre's and Tom Seddon's) but without any real success in deciding what RAM's causing the fault because they're all a bit confusing to a novice.

My question is, what's the best way to determine which RAM chips are faulty without having to remove them all and socketing the board.

Thanks in advance.

Statistics: Posted by centrespot — Wed Jan 28, 2026 12:25 pm

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