Search found 274 matches

by Crazyboss
30 Apr 2021 11:25
Forum: NEW HARDWARE
Topic: Autofire Joystick project.
Replies: 5
Views: 6250

Re: Autofire Joystick project.

Mark, i tried another circuit today. 555 timer.png It worked great, I made a test program (in basic), it seems like i can manual shoot around 15-20 shoots per second. The relay seems to give up around 15 shoots per second. Maybe a solid state relay is faster, i used the click one. acutally my test p...
by Crazyboss
29 Apr 2021 14:45
Forum: NEW HARDWARE
Topic: Autofire Joystick project.
Replies: 5
Views: 6250

Re: Autofire Joystick project.

Hi Mark. Thanks for the input. But if there was a chip somthing like a relay, which could be driven by the 555, so it could open and close just like a manual push button do it would be perfect I was told a NPN could do that, but its not the case. Maybe it works for C64, Amiga etc. But not for MTX. S...
by Crazyboss
29 Apr 2021 12:47
Forum: NEW HARDWARE
Topic: Autofire Joystick project.
Replies: 5
Views: 6250

Autofire Joystick project.

Hi. I wanted to build an autofire for the MTX. I tried to use the 555 timer ic. But it seems like the 555 timer do not put out a very square output, and that fools the MTX to think when its not firering, other inputs come to the joystick. Some people suggested to add a npn transistor, at the output....
by Crazyboss
26 Apr 2021 12:34
Forum: GENERAL DISCUSSIONS
Topic: Eye-watering ebay prices
Replies: 61
Views: 62807

Re: Eye-watering ebay prices

I dont have that much hardware, I think i might have 5-6 computer that works, but no diskdrives, I have a dead SDX (FDX) box, a 80crt card, diskcontrollercard, and also a Silicone Card. But the box is not working, it need service, no time, so for now it have to be a future project. I think Dave have...
by Crazyboss
22 Apr 2021 16:04
Forum: GENERAL DISCUSSIONS
Topic: Eye-watering ebay prices
Replies: 61
Views: 62807

Re: Eye-watering ebay prices

Anybody seen this (admittedly nice) crazy buy-it-now auction on ebay? https://www.ebay.co.uk/itm/ULTRA-RARE-VINTAGE-MEMOTECH-MTX-512-COMPUTER-SYSTEM-MINT-/294120814264?_trksid=p2349624.m46890.l49286 Crazy, opportunistic or worth it? Personally, I think it's at the top end in terms of total package,...
by Crazyboss
19 Apr 2021 19:52
Forum: HARDWARE
Topic: Another dead Memotech - Can it be saved ?
Replies: 3
Views: 4527

Re: Another dead Memotech - Can it be saved ?

I did a bit more testing, it seems like the Z80 and the VDP was dead, i checked the parts in another memotech. But the CTC. The VDP got very hot very fast, so I guess it was shorted. The pal board kind of work but gives gray scale picture, sometimes i get colors, but weird bars and sometimes some re...
by Crazyboss
19 Apr 2021 08:15
Forum: BOOKS, POSTERS, GAMECOVERS ETC.
Topic: Chess, Draughts and Toado posters.
Replies: 0
Views: 84591

Chess, Draughts and Toado posters.

Mikael Anker Madsen have scanned some Continental Software Posters, they are now put at Mtxworld.dk and Archive.org Mtxworld.dk: Chess: http://www.mtxworld.dk/MemotechPosters/Chess%20-%20Memotech%20-%20Continental%20Software%20-%20Poster%202550x3506.png Draughts: http://www.mtxworld.dk/MemotechPoste...
by Crazyboss
18 Apr 2021 21:19
Forum: HARDWARE
Topic: Replacing a 4116 VRAM with a more reliable 4164 - Courtesy o
Replies: 8
Views: 11534

Re: Replacing a 4116 VRAM with a more reliable 4164 - Courtesy o

Hi. This trick also works for the 41256, but it seems like the 41128 chip have another layout. I have just done the same with a Texas and NEC branded 41256 today. The 41256 and 4164 should also run a bit cooler, since it use 5+ only. Hi Folks, as we know, the most common video problem with the MTX i...
by Crazyboss
18 Apr 2021 11:39
Forum: HARDWARE
Topic: Another dead Memotech - Can it be saved ?
Replies: 3
Views: 4527

Another dead Memotech - Can it be saved ?

Yes another dead Memotech, not sure whats the story about this. Not sure if this board will be saved or for parts only, for sure some traces have to be fixed, and even that maybe there is a serious shortcut somewhere at the board causing this burned pcb. burnmtx1.jpg burnmtx2.jpg burnmtx3.jpg burnmt...
by Crazyboss
18 Apr 2021 00:07
Forum: HARDWARE
Topic: Take care when remove ics (Saved a VDP)
Replies: 6
Views: 6271

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

Dave did you fix that Memotech ? :lol: