Search found 322 matches
- Tue Sep 14, 2021 12:59 am
- Forum: Technical questions
- Topic: Jasmin (2) clock buffering trick?
- Replies: 7
- Views: 5868
Re: Jasmin (2) clock buffering trick?
If someone is interested in AmpliBus schematic here is the whole article (with fixed bugs in the schematic :!: ): Actually there's still a bug, the GND symbol is tied to the Vcc line :twisted: And about the strange "short input-output connection" of CD4069 inverter it works! (kind of ...)...
- Mon Sep 13, 2021 1:31 am
- Forum: Technical questions
- Topic: Jasmin (2) clock buffering trick?
- Replies: 7
- Views: 5868
Re: Jasmin (2) clock buffering trick?
After looking at the Ampli-Bus which also has this, I'm convinced it's not a mistake but a design decision.
That's something that should probably be asked on the eevblog forum and tried in pspice.- Sat Sep 11, 2021 2:31 pm
- Forum: Technical questions
- Topic: Jasmin (2) clock buffering trick?
- Replies: 7
- Views: 5868
Re: Jasmin (2) clock buffering trick?
That's what the schematics in Theoric shows, and that's what I thought it was, but someone said yesterday it wasn't the case, and I confirmed from my Jasmin2, Phi2 goes to 3 pins on the CD4069UB, something like 8, 10 and 11. So two inputs and one output. So either: - someone screwed up really good w...
- Sat Sep 11, 2021 12:04 am
- Forum: Technical questions
- Topic: Jasmin (2) clock buffering trick?
- Replies: 7
- Views: 5868
Jasmin (2) clock buffering trick?
During the ORIC visu tonight we discussed the Jasmin controller and the tricks it uses on Phi2. I'm still puzzled as to how it's supposed to work… I tried commenting the facebook post for the visu but it's not allowed it seems. Someone reverse engineered the schematics already, I'd like to get a sca...
- Wed Sep 08, 2021 4:48 pm
- Forum: Hardware hacks and extensions
- Topic: Philips D6260 K7 deck bulk repair
- Replies: 37
- Views: 18634
- Mon Aug 09, 2021 12:58 am
- Forum: General Discussion
- Topic: Giving away faulty tape player
- Replies: 3
- Views: 3227
Re: Giving away faulty tape player
Already have enough on my shelves :-p
Seems to be one for the SC-3000 machine, maybe you'd find interested people on specific forums?
Seems to be one for the SC-3000 machine, maybe you'd find interested people on specific forums?
- Thu Jun 03, 2021 12:51 pm
- Forum: Hardware hacks and extensions
- Topic: Philips D6260 K7 deck bulk repair
- Replies: 37
- Views: 18634
- Wed May 26, 2021 8:57 am
- Forum: Hardware hacks and extensions
- Topic: Philips D6260 K7 deck bulk repair
- Replies: 37
- Views: 18634
- Tue May 25, 2021 9:37 pm
- Forum: Hardware hacks and extensions
- Topic: Philips D6260 K7 deck bulk repair
- Replies: 37
- Views: 18634
- Fri Apr 09, 2021 7:45 pm
- Forum: Hardware hacks and extensions
- Topic: Philips D6260 K7 deck bulk repair
- Replies: 37
- Views: 18634
- Thu Mar 11, 2021 9:47 pm
- Forum: General Discussion
- Topic: Téléstrat frustration
- Replies: 18
- Views: 8206
Re: Téléstrat frustration
Actually if I trust the schematics the -12V comes from the PSU *after* the first 1000.
And yes, these old power supplies can be nasty.
And yes, these old power supplies can be nasty.
- Sat Mar 06, 2021 3:25 pm
- Forum: Hardware hacks and extensions
- Topic: Erebus.
- Replies: 16
- Views: 8826
Re: Erebus.
Although, in the case of peripherals using the same IO they will end up having trouble on the data bus anyway, but yeah…
- Sat Mar 06, 2021 2:16 pm
- Forum: Hardware hacks and extensions
- Topic: Erebus.
- Replies: 16
- Views: 8826
Re: Erebus.
We should to use open collector/drain or Tri-state outputs on /MAP, /ROMDIS, /IRQ, /I/O_CTRL and /RESET lines. Open-collector and tri-state are not the same. Open-collector basically creates an AND gate with all participating outputs, so any one setting it to 0 will get a 0 on the line. Tri-state i...
- Sat Mar 06, 2021 1:49 pm
- Forum: Technical questions
- Topic: ULA versions
- Replies: 15
- Views: 10749
Re: ULA versions
My ORIC-1 has a:
HCS 10017 | CDI-7C | 8316
My own Atmos:
HCS 10017 | CDI/8F | 8409
For the other two Atmos, one was never open and the other one:
HCS 10017 | CDI/8F | 8405
HCS 10017 | CDI-7C | 8316
My own Atmos:
HCS 10017 | CDI/8F | 8409
For the other two Atmos, one was never open and the other one:
HCS 10017 | CDI/8F | 8405
- Tue Mar 02, 2021 5:46 pm
- Forum: Hardware hacks and extensions
- Topic: Protek joystick interface diagram ?
- Replies: 30
- Views: 17395
Re: Protek joystick interface diagram ?
Ok, checking on RS-online, the lowest threshold voltage available for shottky diodes seems to be 240mV. Depending on the internal transistor voltage drop it might work.