13 Jul
2026
13 Jul
'26
4:56 p.m.
On Mon, Jul 13, 2026 at 4:08 PM Jonathan Chapman via cctalk
<cctalk(a)classiccmp.org> wrote:
A number of years ago, I ended up with a pile of
MXV22M QBus controllers, which present a RXV21 compatible interface to the QBus, but talk
to 5.25" diskettes...
http://users.glitchwrks.com/~glitch/2026/07/12/mti-mxv22m-conversion
That's fantastic!
If you have blank fuse PROMs but no way to program,
contact me off-list and I can blow a set on the Data I/O 29B.
Unfortunately, when we did bipolar PROMs at work, it was not those
parts (I personally burned hundreds of 6309 256x8 PROMs, the same ones
used in the Apple Disk II card - I did make one spare set of Disk II
PROMs for myself).
Congrats on figuring it out though. It's a great feeling to be able
to change a device model entirely by just jumpers and programmable
parts.
-ethan