Search found 754 matches

by Godzil
Fri Jul 21, 2017 2:03 am
Forum: Technical questions
Topic: Clock problems
Replies: 3
Views: 105

Re: Clock problems

Phi2 have to be buffered, this is neither a TTL or a CMOS signal, but an unbuffered signal inside the 6502. By the way the original 6502 is using NMOS logic, which is neither CMOS not TTL and is in fact not completely compatible. I mean it compatible is or the Oric would not work at all, but the out...
by Godzil
Sun Jul 16, 2017 2:06 pm
Forum: Demos
Topic: Line Feed - Oric MCP40 demo at Solskogen
Replies: 11
Views: 5307

Re: Line Feed - Oric MCP40 demo at Solskogen

Dbug wrote:
Wed Jul 05, 2017 6:25 pm
I got the small replacement plastic gears and the pens from http://www.best-electronics-ca.com
Great!
by Godzil
Wed Jul 12, 2017 10:14 am
Forum: Hardware hacks and extensions
Topic: Cumulus Firware Compilation
Replies: 136
Views: 32762

Re: Cumulus Firware Compilation

Which would be useless as it would only work on theses cumuluses.
by Godzil
Mon Jul 10, 2017 8:26 pm
Forum: Hardware hacks and extensions
Topic: Cumulus Firware Compilation
Replies: 136
Views: 32762

Re: Cumulus Firware Compilation

Of course, I'm not saying it would be hard :D
by Godzil
Mon Jul 10, 2017 7:51 pm
Forum: Technical questions
Topic: How to install a 3" floppy drive on a modern pc?
Replies: 15
Views: 4483

Re: How to install a 3" floppy drive on a modern pc?

Well that would be an interesting project to make a proper USB-FDC that can handle any type of floppy and no fancy expensive thing like the KryoFlux. You will be able to make copy of a floppy dumped using it but I highly doubt from a DSK. Why not using an Oric with a microdisc and an HxC ? You load ...
by Godzil
Mon Jul 10, 2017 7:46 pm
Forum: Hardware hacks and extensions
Topic: Cumulus Firware Compilation
Replies: 136
Views: 32762

Re: Cumulus Firware Compilation

The EEPROM contain only the microdisk ROM and nothing else. (which is on a legal point a view quite problematic to be honest)
by Godzil
Wed Jun 21, 2017 11:02 pm
Forum: Technical questions
Topic: Compatible transister ?
Replies: 5
Views: 332

Re: Compatible transister ?

I don't have an oric by hand, which transistor is this one?

I mean where is it located?

Is it TR2? (keyboard related one)
by Godzil
Mon Jun 19, 2017 9:01 pm
Forum: Technical questions
Topic: ORIC ULA on a CPLD ?
Replies: 12
Views: 1190

Re: ORIC ULA on a CPLD ?

Is he still alive? :S
by Godzil
Mon Jun 19, 2017 8:57 pm
Forum: Technical questions
Topic: 65C02 CPU
Replies: 3
Views: 332

Re: 65C02 CPU

I think it depends from where you 65C02 come from, the PIN differ a bit between manufacturer :/
by Godzil
Mon Jun 19, 2017 8:54 pm
Forum: Technical questions
Topic: Transformer/ power supply
Replies: 23
Views: 898

Re: Transformer/ power supply

Kenneth: you are right, I think it is that heat that kill my brain ;-)
by Godzil
Sat Jun 17, 2017 2:31 pm
Forum: Technical questions
Topic: Transformer/ power supply
Replies: 23
Views: 898

Re: Transformer/ power supply

Then look again at the track. You will need a bridge rectifier for BOTH regulator, not just one, a 78xx need a DC input not an AC. And here the 7805 is directly fed by one side of the transformer which is AC voltage, that is absolutely not the way to do thing. So here is the schematic of the thing: ...
by Godzil
Sat Jun 17, 2017 10:22 am
Forum: Technical questions
Topic: Transformer/ power supply
Replies: 23
Views: 898

Re: Transformer/ power supply

Ok I don't have the thing in my hands so my intepretation maybe incorrect, it seems the transformer have two output, but what the heck are they feeding the 7805 with a non DC voltage? I will try to make a schematic from that power supply, but can't clearly see the track on the "bottom" side of your ...
by Godzil
Fri Jun 16, 2017 8:43 pm
Forum: Technical questions
Topic: Transformer/ power supply
Replies: 23
Views: 898

Re: Transformer/ power supply

With your multimeter in Ohm mode, with the system unpluged from main (important) what is the resistance on the +5V rail? For a 7805 to not regulate correctly to 5V and drop that low that mean that either something draw a lot of current on the 5V rail (like a failed component) the other reason is tha...
by Godzil
Fri Jun 16, 2017 8:41 pm
Forum: Technical questions
Topic: Oric Atmos resets after a few seconds ... when not grounded
Replies: 38
Views: 10343

Re: Oric Atmos resets after a few seconds ... when not grounded

/me having a look at the ROM So, I'm attaching the concatenated file (which work in Oricutron) : Oric_German.rom.zip The CRC32 is 242799D0 and SHA1 is 101ec597c09c5c387132b0bc477965bcf23412d4 So this ROM report itself as 1.1, but the keyboard is clearly a QWERTZ (pressing Y tape a Z and vice-versa) ...
by Godzil
Wed Jun 14, 2017 10:51 pm
Forum: Technical questions
Topic: Transformer/ power supply
Replies: 23
Views: 898

Re: Transformer/ power supply

If the interface is up, that probably mean it is the 12V which is dead (and the 5V is working fine and dandy) So that only leave the 7812 so unless the 25V 2200uf have miserably failed and make a shortcut (which is possible) it is the likely culprit. I would do a single shortcut check with a multime...