Search found 389 matches

by Martin A
16 Jun 2019 11:35
Forum: NEW HARDWARE
Topic: CFX
Replies: 56
Views: 6980

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: 67

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: 6980

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: 6980

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: 77

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: 219
Views: 4726

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.
by Martin A
08 Jun 2019 14:33
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 31
Views: 370

Re: MTX 512 (debugging thread)

A couple of thoughts: The change at 9D looks like someone's done the timing chain mod from page 47 of the service manual, R32 and R33 look to have ben replaced, you can only see one of them in the photo, but the wrong colours for a 560R. R35 and R36 have been pulled as per the mod. The CMOS chip's d...
by Martin A
31 May 2019 18:14
Forum: NEW HARDWARE
Topic: System test rom/Board
Replies: 26
Views: 946

Re: System test rom/Board

Test rom updated to build 245. the Ram test has been expanded to stop on read failure with a brief diagnostic as shown on this screen dump from the emulator. Since the emulator never actually fails the read back, this is actually fake, :D but it looks better than a photo of my 1980's green screen mo...
by Martin A
31 May 2019 16:30
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 12
Views: 307

Re: Homebrew DIY SAM Coupe ?

If you're going with a high pin count CPLD, then that means working at 3.3v instead of 5v. Rather than invest in a mass of level shifting to accommodate a Z80, the low power version of the Z180 might be an easier fit. The Z8S180 has 20mhz 3.3v version. For an idea of resource cost, I've VHDL code fo...
by Martin A
30 May 2019 19:05
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 12
Views: 307

Re: Homebrew DIY SAM Coupe ?

If you're building a system that can't use PS2 or USB, then the cost of the keyboard components is possibly the biggest outlay. Buying from Mouser in packs of 100, a 12mm key and keycap works out at 60.6p each. With anywhere between 40 (ZX81, Spectrum) and 80 (MTX/MSX/SAM) in a home brew, that can b...