*** M E M O R U M ***

So, ever optimistic, I wrote some Z180 code to test reading and writing an SD card. Of course it does not work, fails on the first step of initialising the card :roll: So back to trying baby steps. Remove the SD card adaptor, and link the MISO input to the MOSI output. This should resulting in recei...

Pi in an MTX case? Dave's already done that: http://primrosebank.net/computers/mtx/p ... inside.htm

It looks like Martin's suggestion is workable, just: Flow Status Successful - Sat Dec 12 11:50:20 2020 Quartus II 64-Bit Version 13.0.1 Build 232 06/12/2013 SP 1 SJ Web Edition Revision Name Z180_EC_Util_CPLD Top-level Entity Name Z180_EC_Util_CPLD Family MAX7000S Device EPM7032SLC44-10 Timing Model...

Interesting thought. The clock I am applying to the SD card is almost exactly as you describe. It had not occurred to me to use this composite signal to drive the shift register as well.

I will have to try tweaking the VHD and see what Quartus makes of it.

Working with the daughter board. The only issue is that the daughter board overlaps the socket for the RTC. Would probably be OK if it was a normal IC, but the RTC is rather taller, and I am not sure whether there is room. Still, the next thing to try is the SD card interface. One thing I discovered...

Working in Kicad it should not be so easy to mirror connections. Everything is designed from a top-side view. So unless the transparency is flipped when etching, everything should be the correct way around. In this case the connectors are not mirrored. The diagrams from Kicad are mostly just 180deg ...

20201205_125318.jpg My patch board. It plugs into the sockets originally intended for the level shifters, and has: Current limit resistors on all the signals from the Z180 to the Propeller 74HCT245 to buffer the data lines back to the Z180 74LS32 to drive the direction line on the HC245 buffer (I d...

From Andy's MEMU website (actually the copy downloaded with a copy of MEMU): You'll need to refer to a picture of the Spectrum keyboard to work out what keys to press. Right Shift is mapped to Symbol Shift (and on Windows to press Right Shift on the MTX keyboard, you actually press the "applica...

ex: Programs to draw double sided printed circuits, to design new characters on monitors and DMX, ... My own PCB design software for the MTX can be found on Dave's site http://primrosebank.net/computers/cpm/cpm_mtx_user_progs.htm . I used it to create a number of PCB's back then. My more recent PCB...

If you are able to use an audio capture program (on a more modern computer) to turn the tapes into WAV files you might then see what TapeView can make of them.