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There's a full listing of the MTX Rom source included in with the CFX source code. It shouldn't be too hard to steal/look at the tape loading code http://primrosebank.net/computers/mtx/projects/cfx/cfx.htm#source Open with Wordpad (Notepad wont recognise the Unix style end of line markers.) The tape...

What you're suggesting is pretty much what the FDX boot rom does to get a MTX512 to run CPM. Once it's finished the rom isn't even in the memory map any more. However in order to do that it has to install it's own screen/keyboard handlers. The rom also turns off the interrupts and CTC for safety. As...

Interesting result, the big difference between the 4116 and hacked 4164 is the voltages, the newer chip is 5v only.

It might be worth double checking the power transistor and regulators again.

Ah, how would Mrs S cope with a horde of Really Geeky people ?

You can get away with using "modified" 64k DRAM chips if need be, they have the advantage of not needing -5v or 12 and also run cooler as a result http://primrosebank.net/computers/mtx/projects/mavram/mavram.htm I ran another experiment this evening, I faked a main memory fault by removing...

I've never thought of scoping the VRAM pins, as interpreting the output is somewhat tricky. So I've just had a go on the system being used to test/develop CFX, It's displaying the CFX's boot screen which is white text on dark blue This was the trace for what the manual says is the RD2 line Ads00010....

There's a new software build(132) on Dave's site. No Major changes what I have done though:

There's a brief reminder of the USER commands available, from the boot screen.
USER SYSCOPY is de-activated and now returns an error.
USER COPY no longer prompts for disc changes.

With the CFX being much more complex in use than the Magrom, there will be a manual for it at some point. Right now the manual is very much a work in progress. As the current software is basically the first build that has everything we wanted running, I've only just started the documentation. From y...

And you can use the first 4 partitions as drives B to E from the SDX rom too, CPM has to be used to prepare them as there's no SDX format command (well there IS but it'll just return with "mistake") If you accidentally access any drive higher than E, you'll get an error message straight ou...

Any issues, problems, ideas do let us know.

It's had a lot of testing, but the more people try it, the more confident I'll be that my changes to the original SDX and FDX code don't do anything silly or unexpected.