Search found 511 matches

by Martin A
18 Apr 2021 17:52
Forum: OFF TOPIC
Topic: Yet another Z180
Replies: 0
Views: 29

Yet another Z180

Over on ther 6502 forums there was a post outlining what's basically a 2 chip VGA adaptor, using a 64 macrocell CPLD and a 4k dual port RAM: http://forum.6502.org/viewtopic.php?f=10&t=6502 It's such a simple idea I decided to try one. Having coded definable, in 6bit fpreground, background and border...
by Martin A
18 Apr 2021 16:15
Forum: HARDWARE
Topic: Another dead Memotech - Can it be saved ?
Replies: 3
Views: 85

Re: Another dead Memotech - Can it be saved ?

The bent pin should be saveable, if you go slow and steady with the pliers. With the board already modified to take the 2564 EPROM, if you DO decide ressurect it, then making the extra changes to fit a slightly more modern (ie only 35 years old) 2764 EPROM (or even newer 27C64 or 28C64 EEPROM) might...
by Martin A
17 Apr 2021 19:55
Forum: HARDWARE
Topic: Take care when remove ics (Saved a VDP)
Replies: 6
Views: 115

Re: Take care when remove ics (Saved a VDP)

Seeing all that crud on the pins, I'm surprised it came out at all. Well done!!
by Martin A
13 Apr 2021 22:35
Forum: GENERAL DISCUSSIONS
Topic: Best dust cover
Replies: 6
Views: 132

Re: Best dust cover

The BBC master is about the same width, but way deeper, and probably equally hard to find. The original IBM PC keyboard would have been a similar size, but i whether that's similar enough, it also has the same availability issue. Or there's the outside of the box thinking - and cut down a patio set ...
by Martin A
11 Apr 2021 16:17
Forum: SOFTWARE
Topic: Question #2: EXEROM and tape loading
Replies: 29
Views: 725

Re: Question #2: EXEROM and tape loading

That's a bit of a jump from "It's not practical to re-write the OS" to "the machine is crippled." Using Jon's systems as an example ( http://www.mtxworld.dk/memorum/viewtopic.php?f=10&t=505 ) How many pople who've just spent £275 on a vintage system in A1 condition would be willing to take a knife t...
by Martin A
09 Apr 2021 14:29
Forum: HARDWARE
Topic: Keyboard testing.
Replies: 2
Views: 126

Re: Keyboard testing.

Something like

Code: Select all

10 POKE 64862,13
20 PRINT ASC(INKEY$)
30 GOTO 20
That would test everything, the function keys return codes 128 to 143 depending on shift.

The first line turns off the break key so you can "test" that, but it means reset is the only way out.
by Martin A
08 Apr 2021 19:35
Forum: SOFTWARE
Topic: Question #2: EXEROM and tape loading
Replies: 29
Views: 725

Re: Question #2: EXEROM and tape loading

From what I've seen in photos the chip select for the piggyback rom is "yellow wired" to GROM using a convenient via to anchor it. That's why the V1.1 Magrom needed an extra chip, to decode ROM 6, compared to the original that uses GROM, to make it work with language roms. As far a CFX goes, that on...
by Martin A
08 Apr 2021 15:42
Forum: SOFTWARE
Topic: Question #2: EXEROM and tape loading
Replies: 29
Views: 725

Re: Question #2: EXEROM and tape loading

Any chances for e.g. an improved ROM today? Hasn't anybody considered something like that? :roll: Leaving aside the reluctance of MTX owners to open their systems, (external fit CFX and Magrom outnumber their internal cousins about 4 to 1), and the small number of "active" Z80 coders in the MTX sce...
by Martin A
08 Apr 2021 14:48
Forum: MEMOFEST 2021
Topic: MEMOFEST 2021
Replies: 0
Views: 17

MEMOFEST 2021

So... England's COVID restrictions are currently scheduled to end in June, meaning they ought to be well out of the way by the "traditional" early Autimn Memofest date. Now I don't want to stop anyone else volunteering, after all I've been the host a couple of times before. However, to get the ball ...
by Martin A
06 Apr 2021 19:53
Forum: SOFTWARE
Topic: Question #1: .MTX and/or .RUN to .WAV conversion
Replies: 10
Views: 280

Re: Question #1: .MTX and/or .RUN to .WAV conversion

Andy's put VRAM snapshot and CPU snapshot diagnostic options in Memu. I don't think there's an all in one dump everything option or a reload VRAM from snapshot, though I'm willing to be corrected. For those games with copies in MTX file format, then yes they can be "processed" on modern kit to "clea...