This is an old post, preserved for reference.
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This is the Minstrel ZXpand. It is a version of the ZXpand SD card disk drive specifically designed for the Minstrel 2 and Minstrel 3 computers.
Minstrel Keyboard overlays already had the ZXpand keywords on them?
Paul Farrows flicker free ZX80 games can use the Kempston interface, press C to change the control type on the main screens.
INKEY$ command to read the keyboard will also now benefit from joystick support as the INKEY$ function is also replaced in the overlay ROM. The Minstrel ZXpand can be configured as to which key will be pressed for each direction using the CONFIG command. Hey ZX81 Adventures, can we have joystick support for Tut-Tut?
Suitable for the Minstrel 2 and Minstrel 3. Not suitable for anything else. Really, I mean, it just won't work. I'm not just saying that. It won't, the firmware is different, the overlay ROM is not on board. The RAM is not there. Half of the decoding logic isn't there because it's already on the Minstrel board. Listen...... No, look..... Oh, whatever....... No, it's clearly not wide enough to fit behind an Amstrad CPC 464............No, it will not work on a TS1000 (or a T-1000) or a TS1500 or a Lambda 8300, or a Commodore PET or an Altair 8800 or on anything else, and let''s be absolutely clear here, even if it looks like it might fit in the hole in the back of the case, it still won't work.................OK, OK, I admit it. If you disable the ZXpand section completely, then only the Kempston joystick interface would probably work on a ZX81. But that's your lot mush.
2022 Update: We did a final run of Minstrel 3 with the ZXpand kits, as part of the "Final Edition" runs. Those have all sold out now, so there will not be any more I am afraid. At the time of writing, there are still a few Minstrel 2 (ZX80) and Minstrel 3 (ZX81) kits without ZXpand available from The Future Was 8 bit