FDXB

[wyerd]

Can the REMEMOrizer run FDXB.COM? I've tried both versions from Dave's site and all I get is a black screen on the A/V channel.

[Martin A]

It's been a LONG time since I had access to a FDX, but from memory, FDXB puts everything on the 80 column screen by default.

Until you do CRVS & VS to do output through the VDP that side of things is just an uninitialised black screen.

[wyerd]

It's been a LONG time since I had access to a FDX, but from memory, FDXB puts everything on the 80 column screen by default.

Until you do CRVS & VS to do output through the VDP that side of things is just an uninitialised black screen.

Martin, I'm using the MTX connected to a REMEMOrizer. When I run FDXB from CP/M, the cursor drops to the next line and carries on blinking with no other prompt - that's why I thought it was supposed to be something on the other display.

Can FDXB run on the REMEMOrizer?

[Martin A]

I haven't tried FDXB on the Rememorizer. I've not got it on the SD card to test.

However I DO have a partial disassembly, and it looks like FDXB does it's own disc handling (it certainly trashes the CPM low memory) so I suspect the answer is its not compatible.

[Dave]

As far as I can remember.......

FDXB expects to see an FDX SM1 disk controller, I don't think that REMEMOrizer emulates that, so FDXB will fail

Regards
Dave

[wyerd]

OK. Thanks Dave.

[AndyKey]

I have previous considered patching FDXB.COM to make a REMEMOTECH/REMEMOrizer version.

It actually overwrites/replaces CP/M, and therefore includes its own driver for the disk.

Maybe one day I get back to looking at this...

{{{ Andy

[Martin A]

This might help build FDXB for ReMemorizer. It's all in the format my Acorn based assembler uses, so might take a little bit of work to get it into a more standard format.

I was looking at doing something similar for CFX, but I've not yet managed to get my head around the 80 Column video sections.

The Disc part doesn't look that complicated, there's a pretty much complete implementation of CPM's BDOS and the same USER code that SDX uses. I looks like it just needs the low level routines replaced.

[wyerd]

@Andy - I'd really appreciate it if you could take a look at it. Thanks!

@Martin A - Hopefully Andy will be able to make use of your code. Thanks!