Search found 681 matches

by hlide
Sat Jun 23, 2018 7:33 pm
Forum: Hardware
Topic: Can my MZ80K set fire?
Replies: 2
Views: 22738

Re: Can my MZ80K set fire?

My first MZ-80 K did make a bang then smoke. But it didn't take fire. The MZ-700 I bought under one year ago has the "famous" X2 capacity exploded (it was already this way before I bought it). Whenever I powered it, I found it smelled too much so I decided to have a look at it. And I made ...
by hlide
Mon Jun 18, 2018 3:06 pm
Forum: Hardware
Topic: [MZ-SD2CMT] GitHub link
Replies: 55
Views: 63179

Re: [MZ-SD2CMT] GitHub link

FR: Ok, j'ai profité de ce weekend - non sans quelques difficultés - pour avancer sur mon projet. J'ai commençé à apporter une modification pour être en mesure de lire un MZF et de le transcrire en SHARP PWM. C'est un travail en cours. Je voulais garder la même façon de procéder que pour lire le fic...
by hlide
Tue Jun 12, 2018 9:17 am
Forum: Hardware
Topic: MZ-80B Power Supply Repair
Replies: 14
Views: 15284

Re: MZ-80B Power Supply Repair

I would love to have both MZ-80A and B but I guess the prices won't be cheap. And damn I start lacking places to put my retro-computers :/.
by hlide
Tue Jun 12, 2018 9:14 am
Forum: Hardware
Topic: MZ-80B Power Supply Repair
Replies: 14
Views: 15284

Re: MZ-80B Power Supply Repair

I am beginning to wonder if it might be the monitor ROM (EPROM?) at fault. It looks like VRAM is fine as the display is perfect. I just cannot understand what else might stop the monitor program completing its loading as I assume the memory test is in ROM? ROM needs a small RAM space (0x1000-0x11FF...
by hlide
Tue Jun 12, 2018 9:08 am
Forum: Hardware
Topic: MZ-80B Power Supply Repair
Replies: 14
Views: 15284

Re: MZ-80B Power Supply Repair

For the program to be loaded, I suppose you got it recorded on a tape. If not and you have an MZ-700 with a working tape recorder, there is a way: enter the bytes with M command and save them with S command in a tape. Then you should be able to play it on MZ-80 K. There is a small complication: if y...
by hlide
Tue Jun 12, 2018 8:47 am
Forum: Hardware
Topic: MZ-80B Power Supply Repair
Replies: 14
Views: 15284

Re: MZ-80B Power Supply Repair

I made a program RAMTEST to determine which row and which chip has an issue: the program is loaded into VRAM (so you'll see some weird characters at first lines) and will check some patterns (D0 chip: 01 - D1 chip: 02 - D2 chip: 04 - D3 chip: 08 - D4 chip: 10 - D5 chip: 20 - D6 chip: 40 - D7 chip: 8...
by hlide
Mon Jun 11, 2018 5:03 pm
Forum: Hardware
Topic: MZ-80B Power Supply Repair
Replies: 14
Views: 15284

Re: MZ-80B Power Supply Repair

Yes, the speed is 1800 bauds for MZ-80B and 1200 bauds elsewhere. There are small differences in timings in the encoding too (shorter GAP). You can find this information here.
by hlide
Fri Jun 08, 2018 10:10 pm
Forum: Hardware
Topic: MZ2TAPE: Fast transfer 100ko / min through the tape socket / MZ2TAPE : Transfert rapide 100ko/min par la prise cassette
Replies: 25
Views: 27217

Re: MZ2TAPE: Fast transfer 100ko / min through the tape socket / MZ2TAPE : Transfert rapide 100ko/min par la prise casse

FR: Eh eh eh. Non, il me reste encore en réserve quelques idées à tester. Mais avec ton code, je vais pouvoir les tester rapidement. Mon soucis actuel, c'est que depuis que je me suis mis à la collection des MZ et à faire joujou avec l'Arduino (à cause d'un lecteur de cassette non fonctionnel), je n...
by hlide
Fri Jun 08, 2018 3:24 pm
Forum: Hardware
Topic: MZ2TAPE: Fast transfer 100ko / min through the tape socket / MZ2TAPE : Transfert rapide 100ko/min par la prise cassette
Replies: 25
Views: 27217

Re: MZ2TAPE: Fast transfer 100ko / min through the tape socket / MZ2TAPE : Transfert rapide 100ko/min par la prise casse

Bon je vois que tu as fait à peu près tout ce que je voulais faire (inclure le code dans le commentaire du header, etc.) - à un détail près - n'avoir que 2 signaux au lieu de 3.