On Mon, Jul 13, 2026 at 4:08 PM Jonathan Chapman via cctalk <[email protected]> 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
