Search found 433 matches

by Martin A
23 Jun 2019 20:27
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 7870

Re: Bootstrap and boot blocks

I've had fun with this card with my own boot ROMs and it seems to take longer than many to initialize and respond post reset. The propeller boot time adds about a half second extra to the start up time with the CFX-II. It doesn't sound a lot, but because the MTX does almost no boot checks, it notic...
by Martin A
22 Jun 2019 22:38
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 7870

Re: Bootstrap and boot blocks

Is the stuff that CP/M does calling via 0xFFF9 documented somewhere. I can see the call ends up loading 0x34 sectors to CE80 but not how you set which sector to start or what happens if you call it multiple times. The FDX technical manual section 1.6 has the basic details of the high memory allocat...
by Martin A
22 Jun 2019 19:38
Forum: PROGRAMMING
Topic: Bootstrap and boot blocks
Replies: 99
Views: 7870

Re: Bootstrap and boot blocks

Since CPM doesn't know anything about partitions, on boot it just reads track 0, sector 1 (of 128 bytes) to 0100 and then jumps to 0100 with the stack set to 0200. The silicon disc code looks for C3 01 40 to make sure the image is valid (JP 0140) but the CF code, like the original floppy doesn't. It...
by Martin A
21 Jun 2019 18:35
Forum: CP/M
Topic: Best text editor in CP/M
Replies: 7
Views: 1176

Re: Best text editor in CP/M

I always used Newword in non document mode for creating assembler files.

It came with the system and is a heck of a lot more friendly than the CPM editor ED.COM.
by Martin A
16 Jun 2019 11:35
Forum: NEW HARDWARE
Topic: CFX
Replies: 56
Views: 10528

Re: CFX

USER MTX is basically the original Memotech code for USER LOAD tweaked to account for the differences between disc basic and tape basic. It only works for single file MTX files, as any 2 stage loaders are going to be calling the rom's tape loader directly, and patching the rom isn't an option. That ...
by Martin A
10 Jun 2019 22:58
Forum: GENERAL DISCUSSIONS
Topic: MTX Games: Best I've seen/heard: Rolla Bearing
Replies: 4
Views: 547

Re: MTX Games: Best I've seen/heard: Rolla Bearing

All RB.BAS does is read in the real game file RB.DAT and run it.

load in RB.BAS,
add in
30 STOP
40 USER SAVE"RB.BAS"
50 GOTO 10

Start that with GOTO 40, and from then on it'll auto run.

And I agree, the sound track is pretty good !
by Martin A
09 Jun 2019 22:49
Forum: NEW HARDWARE
Topic: CFX
Replies: 56
Views: 10528

Re: CFX

It should already boot as 18. But probably will also have C and maybe F configured I can't remember. But if it isn't, booting into CPM with return held down bypasses the disc boot and runs the monitor instead, from that command prompt type BB18 And that should boot off the B drive configured as type...
by Martin A
09 Jun 2019 20:58
Forum: NEW HARDWARE
Topic: CFX
Replies: 56
Views: 10528

Re: CFX

You just could try it! Grab the Rememotech distribution package from Andy's website. Write the SDdisc.Bin package to your 4 meg card with a imaging program Configure it as a type 18 drive but don't fill more than half of it. It might work. CPM has very simple allocation rules and just uses the first...
by Martin A
09 Jun 2019 13:01
Forum: GENERAL DISCUSSIONS
Topic: RS232 communications board manual.
Replies: 4
Views: 601

Re: RS232 communications board manual.

Is there anything in that one that's not in the last dozen or so pages of the FDX technical manual ?
by Martin A
08 Jun 2019 23:59
Forum: HARDWARE
Topic: Resurrecting an MTX500.
Replies: 226
Views: 18372

Re: Resurrecting an MTX500.

The address decoding is 90% done in the PAL/GAL so that ought to be testable in the programmer.

The last 10% being done by the 74LS00 at J10 selects between rom B and rom C if the page roms are active.