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Mostly, I would like the time needed to play. However a few random thoughts: Slightly off topic, but I must get around to adding DART & RS232 driver chips to my comms. board. I would cable both serial ports to a single 25-pin D (or see if I could squeeze two 9-pin D into the space). I could then...

For the printer port, this is one board that appears to meet the requirements. There are probably many others. Note that the circuit is actually fairly simple. You might want to consider a single custom PCB that: Interfaces the keyboard & joystick connectors to the GPIO pins. Implements the MCP2...

I have now researched the VGA option a bit. Use of this blocks the use of i2c1. If not using a HAT, and since will not be using the camera, i2c0 should be possible, although it is not recommended. Also, driving the two displays would require use of the DISPMANX API, which is less than well documente...

Dave, Too many ideas (as usual). I remembered this post on the Raspberry Pi blog. With this, it would be possible for MTX Pi to have simultaneous 40 & 80 column displays, as per the real MTX. Only problem is that it takes up most of the GPIO pins. More research needed to determine whether at lea...

Dave,

Thinking about this further, will a B+ or 2B fit in the MTX case? As Martin remarked recently, there is not much room under the keyboard.

If not, then an A+ is indicated. Still possible, but it does change the additional hardware needed.

Bill.

Dave, OK, I will bite. Use a Raspberry Pi B+ or 2B. They have more than enough GPIO lines to work the MTX drive and sense lines directly. Connect the appropriate ones to the joystick ports as well and those come free. Software wise it is dead easy. Skip all the complex event trapping and keyboard ma...

I haven't tried this, but I think it is possible. However the process is more complex than writing a batch file. You need to create your own menu program, which does the following steps: Displays your menu of options to select. Processes user input to select an item. Creates a file "A:$$$.SUB&q...

I would like to attend on the Saturday, but not yet sure whether I will be free to do so. May we have some details on accessibility by public transport? I prefer not to drive that distance. If I get there I could demo the work I have been doing getting MEMU to run an Oxford Ring (NODE). Would bring ...

I note with considerable interest the Compact Flash storage that Martin is developing for the MTX http://www.primrosebank.net/computers/mtx/projects/cfx/cfx.htm . It looks very interesting. I wonder whether it would also support interfacing to PATA hard disks, as I believe that the interface is esse...

An interesting enhanced ZX81 clone I saw while lurking on the Raspberry Pi forum:

https://revspace.nl/ZX81%2B34_ZX81_clone
https://www.raspberrypi.org/forums/view ... 62&t=77429