Search found 73 matches
- Wed Mar 06, 2019 2:42 pm
- Forum: TWEAKS & FIXES
- Topic: TT Rom access speedup
- Replies: 25
- Views: 19907
TT Rom access speedup
Hello, So far I've tried this sucessfully on 3 different TT machines and it works well. It only takes two diodes, Germanium or Schottky (Bat 48). Connect the anode of one diode to XDS0 and a second diode to XDS1. These signals can be found on the ST-Ram board pins 15 and 16 of the C row, connector t...
- Thu Feb 28, 2019 6:01 pm
- Forum: H4 MONGREL EDITION DEVELOPMENT & INFO
- Topic: ST-IDE-ROM Dev Board v1 - BETA Testers
- Replies: 672
- Views: 239129
ST-IDE-ROM Dev Board v1 - BETA Testers
Hello,
Please put me on the list as well.
BR/
Guus Assmann
Please put me on the list as well.
BR/
Guus Assmann
- Fri Feb 01, 2019 3:48 pm
- Forum: FLOPPY DRIVES KITS & UPGRADES
- Topic: Internal Gotek/FlashFloppy and external disk drive
- Replies: 10
- Views: 10822
Re: Internal Gotek/FlashFloppy and external disk drive
Hello, An Internal floppy is selected on wire 10, that's connected to DS0 select from the Atari. The external connector is connected to the second floppy select from the Atari. To use the internal cable, the D1 line from the Atari should be connected to wire 12 in the flat cable. Then a drive set as...
- Thu Sep 13, 2018 4:06 pm
- Forum: RTC (Real time clock)
- Topic: 030 exxos RTC issues.
- Replies: 18
- Views: 14300
Re: 030 exxos RTC issues.
Hello, Some time ago, I've replaced the RTC on a number of Falcons. With the old RTC they still worked, also after I put a socket in the board. However, with the new RTC-chip, they wouldn't boot, the chips being new and from Mouser. To remidy the situation, I put the old RTC back and booted the Falc...
- Sat Aug 18, 2018 8:43 pm
- Forum: ELECTRONICS
- Topic: competent repair people ?
- Replies: 31
- Views: 47143
Re: competent repair people ?
Hello Sam, In my opinion, recapping is as complicated as replacing the wheel on a car if you have a flat. Meaning that every tech who can wield a soldering iron and can recognise the parts will do. Most "Radio Ham's " will be able to do the job. And they are "all over the world" ...
- Wed May 16, 2018 8:28 pm
- Forum: PSU (power supplies)
- Topic: Future PSU designs
- Replies: 124
- Views: 86911
Future PSU designs
Hello Exxos, If I see it right, there's 3 primary windings needed. Or maybe it can be done with 2. 3 windings: 115V, 115V and 10V. All series = 240V, 2 x 115V series for 230V, 2 x 115V parallel, obvious. Or maybe you can get away with 2 windings of 120V. Now if you have those windings made such that...
- Sun Mar 18, 2018 9:42 pm
- Forum: HARDWARE ISSUES
- Topic: MegaST 4 will not boot, but looks fine with diagnostics
- Replies: 11
- Views: 6520
Re: MegaST 4 will not boot, but looks fine with diagnostics
Finally, I found some courage and inpiration.
And solved the problem.
Jumper W2 had a bad contact.
But it was hidden below the body of the part.
So there was no or a bad connection from the decoding chip to the Eprom.
The board works fine again.
BR/
Guus
And solved the problem.
Jumper W2 had a bad contact.
But it was hidden below the body of the part.
So there was no or a bad connection from the decoding chip to the Eprom.
The board works fine again.
BR/
Guus
- Wed Jan 03, 2018 9:23 pm
- Forum: HARDWARE ISSUES
- Topic: MegaST 4 will not boot, but looks fine with diagnostics
- Replies: 11
- Views: 6520
Re: MegaST 4 will not boot, but looks fine with diagnostics
Have replaced the sockets, now two quality sockets with round contacts are in.
Still with these it doesn't work either.
However it was a very good idea.
Still with these it doesn't work either.
However it was a very good idea.
- Mon Jan 01, 2018 9:12 pm
- Forum: HARDWARE ISSUES
- Topic: MegaST 4 will not boot, but looks fine with diagnostics
- Replies: 11
- Views: 6520
Re: MegaST 4 will not boot, but looks fine with diagnostics
Hello, The working one has 120nS Eproms. I have yet not tested with faster 29F010 Flash, 90nS. Will do that as well. Of course this card has a Gal. 16V8 25LNC. I have tested with 6 Eproms, Tos 1.04NL in 200nS Eproms. Not ok. Then I took Tos 1.04UK in 6 Eproms 100nS. Also not ok. (Yes, I changed W2- ...
- Sun Dec 31, 2017 2:07 pm
- Forum: HARDWARE ISSUES
- Topic: MegaST 4 will not boot, but looks fine with diagnostics
- Replies: 11
- Views: 6520
Re: MegaST 4 will not boot, but looks fine with diagnostics
Hello, Ram test keeps working just fine. As does the floppy test. Replacing the CPU has not helped, and removing the blitter is not a solution. I've replaced MCU, Glue, DMA, Floppy controller and Blitter. Using the two-tosses (Exxos) also doesn't work. And the Shifter buffer doesn't help either. The...