Another EPROM in the archive...

[brad sanders]

chrisc at zetnet.co.uk (Chris Crosskey) was saying...

>Latest EPROM to join the archive is the Doepfer MMG midimerge unit. It 
>is <groan> yet another 2764 feeding an 8031. I'll be doing a hobbiests 
>version of the circuit soon, using IDC Ribbon cable to carry data 
>busses around, as you can earth every other wire and get a 
>semi-screened 2.5mm ribbon. It also uses four 68B50 AICA chips, a 
>bunch of CNY17-2's and a couple of logic buffers etc.

I hope a couple of those buffers are for the MCU control lines. The
NMOS 8051/8031s are fairly well behaved, but I've had problems with
the CMOS versions just running blue wires on a small (2.5x3.5) proto
card! WR* and RD* seem the most sensitive, especially w/regard to ALE.
I hate to think of the mess a beginner (or just someone not well
versed in microcontroller use) might get into stuffing a board like
this with the "wrong version" of a chip.