Search found 1930 matches
- Wed Mar 27, 2024 10:04 pm
- Forum: HARDWARE DISCUSSIONS
- Topic: 12V needed for ST?
- Replies: 2
- Views: 67
12V needed for ST?
Really quick one. I didn't want to pollute another thread. I've seen it said a lot -- and I just saw RJ (I think) mention it on another thread -- that the 12V line isn't needed for the ST to boot. I thought this was true too but couldn't get anything out of either of my STs when relying on this. Tur...
- Wed Mar 27, 2024 9:57 pm
- Forum: HARDWARE DISCUSSIONS
- Topic: Atari ST OPL3 cart schematics
- Replies: 14
- Views: 773
Re: Atari ST OPL3 cart schematics
This is R/W timing: Tww - 100ns, Twds - 10ns Twdh - 20ns opl3Timing.png The only one there I think that matters is Tww of 100ns. If you drive it from a combination of ROM3 and A1 (if you want to identify chips with on A1, A2 etc.) then the minimum assertion time for an ST would be two clock cycles....
- Wed Mar 27, 2024 8:14 pm
- Forum: NOOB QUESTIONS
- Topic: Atari Falcon Schematic PCB layout
- Replies: 1
- Views: 90
Re: Atari Falcon Schematic PCB layout
Hi! I found the Atari Falcon030 Service Guide, but it is electronic oriented, and there are not all the PCB layout informations, like : where is the fan connector? Where is the sound connector? What is this switch for, and this one, etc? Any chance I could find a good pic of the PCB with all the ma...
- Wed Mar 27, 2024 7:49 pm
- Forum: HARDWARE DISCUSSIONS
- Topic: Atari ST OPL3 cart schematics
- Replies: 14
- Views: 773
Re: Atari ST OPL3 cart schematics
Sorry -- daughter's not been well today. Not really had time to read all this properly. Responding a bit ad-hoc. Need for this latch was purely to save state of adress lines to have certain pattern set on OPL3 data / address lines, after setting this I need to (assert /WR low or high OPL3 for certai...
- Tue Mar 26, 2024 8:41 pm
- Forum: HARDWARE DISCUSSIONS
- Topic: Atari ST OPL3 cart schematics
- Replies: 14
- Views: 773
Re: Atari ST OPL3 cart schematics
I think more experienced people will look at it the better. I've got already some feedback issues related to pcb, which I would like to address in next version. Currently I'm mostly worried about physical pcb and issues related to power connections and decoupling capacitors, so if you could take a ...
- Tue Mar 26, 2024 2:06 pm
- Forum: HARDWARE DISCUSSIONS
- Topic: Atari ST OPL3 cart schematics
- Replies: 14
- Views: 773
Re: Atari ST OPL3 cart schematics
I've made some changes to development pcb . I've shortened length a little and added pinouts for OPL3 interface hardware debugging.I hope to get some more feedback/review before I send it for manufacturing. I'd like to offer some help, but I'm not an audio guy and know little about what's needed on...
- Mon Mar 18, 2024 11:42 am
- Forum: MEMBER BLOGS
- Topic: LC III - Will it ever run?
- Replies: 84
- Views: 1902
- Sat Mar 16, 2024 10:53 pm
- Forum: CHAT FORUM PUBLIC
- Topic: Cyber Legends 3 Poll ***[PLEASE VOTE ASAP!]****
- Replies: 28
- Views: 1474
- Fri Mar 15, 2024 3:22 pm
- Forum: MEMBER BLOGS
- Topic: LC III - Will it ever run?
- Replies: 84
- Views: 1902
Re: LC III - Will it ever run?
I'm wondering if the CPU isn't seeing all the data bits the ROMs are setting on the data bus. This would make the start address wrong and it would also load a corrupted instruction and maybe try to access something in the I/O area ... So as to rule out the sockets, the HI ROM socket has corroded wi...
- Fri Mar 15, 2024 2:52 pm
- Forum: MEMBER BLOGS
- Topic: LC III - Will it ever run?
- Replies: 84
- Views: 1902
Re: LC III - Will it ever run?
OK, so no burst read is being requested but /STERM is being activated. The /BERR happens after a timeout. But /DSACK0 and /DSACK1 never go low! Sorry, I've not been following the thread in detail, but from your screen capture it looks like you've got an 030. In which case: STERM and DSACKx are muta...