Hello Frank,
Looking at the adapter board and your remark: There seems to be enough room, so why not include the FPU board in the adapter card?
That would be a very nice combination.
BR/
Guus
Search found 73 matches
- Fri Dec 17, 2021 9:39 am
- Forum: MEMBER BLOGS
- Topic: Soph's Mega ST4
- Replies: 18
- Views: 4540
- Sat Mar 06, 2021 3:02 pm
- Forum: FLOPPY DRIVES KITS & UPGRADES
- Topic: HD V6 board connections (STe)
- Replies: 10
- Views: 5285
HD V6 board connections (STe)
My experience, try not to bend the pins. They are quite hard and will break easy. Just make sure the holes in the HD module are as clean as possible. Then insert the thin end of the strip into the socket. And place the HD module on top of the strip. The pins will be in the holes at an angle, but tha...
- Sun Feb 07, 2021 3:10 pm
- Forum: ATARI FOR SALE & WANTED
- Topic: WANTED MegaST 68881 copro board C103067 / SPF004
- Replies: 25
- Views: 9442
WANTED MegaST 68881 copro board C103067 / SPF004
Hello, I do have a complete card, with a 68881. It is an original, with one "flaw". The Oscillator has been removed and put in a socket. This has been done to test the Co-Pro at higher speeds, and it does. I'm willing to sell it for a good price. (definitely not top dollar) Downside is, th...
- Wed Jun 10, 2020 8:53 pm
- Forum: 8 BIT CORNER
- Topic: 65XE boot issues
- Replies: 34
- Views: 16810
65XE boot issues
Hello Ziggy, Good to see that. Also good you didn't give up. Now you can also consider to expand the memory to more than 128K. The memory error must be a defect in the address lines. So check the lines between the Freddy chip and the address-lines of the Ram. Also, the address lines from CPU to Fred...
- Wed Jun 10, 2020 3:42 pm
- Forum: 8 BIT CORNER
- Topic: 65XE boot issues
- Replies: 34
- Views: 16810
65XE boot issues
Hello, Good to read that I'm contributing. If it's not solved with the MMU, then we'll keep rethinking. I'm positive that it's possible to get the board 100% again, it's working for a big part anyway. Pitty that UK and NL are so far apart and postage is not so cheap. Anyway, keep up the good work. I...
- Tue Jun 09, 2020 7:04 pm
- Forum: 8 BIT CORNER
- Topic: A little bit of 8 Bit: 65XE upgrade to 128k RAM
- Replies: 65
- Views: 40439
A little bit of 8 Bit: 65XE upgrade to 128k RAM
Good that you found the problem. :D Soldering jobs are not always as easy as they look. This may not be a reset problem but a totally different one. To check that theory, take a game cartridge. Switch off, plug the cartridge and switch on. The cartridge should run. Now switch off, pull the cartridge...
- Tue Jun 09, 2020 6:54 pm
- Forum: 8 BIT CORNER
- Topic: 65XE boot issues
- Replies: 34
- Views: 16810
65XE boot issues
Sure I know I don't have to answer fast. But I do know how frustrating it can be if a computer problem eludes you. The problem on this one seems to do so. My next point of action would be to desolder the MMU. But for me that's not such a big deal, I've done it many times. And I hate to destroy possi...
- Mon Jun 08, 2020 6:41 pm
- Forum: 8 BIT CORNER
- Topic: A little bit of 8 Bit: 65XE upgrade to 128k RAM
- Replies: 65
- Views: 40439
Re: A little bit of 8 Bit: 65XE upgrade to 128k RAM
Hello, Did you leave pin 7, 8, 9, 12 and 13 from the GAL out of the board and bend them up? They shouldn't make any connection to the MB. The redish screen usually means a Ram fault or the CPU not running. To test the standard part, remove R111 at the side that's not connected to pin 15 of the Ram a...
- Mon Jun 08, 2020 6:17 pm
- Forum: 8 BIT CORNER
- Topic: 65XE boot issues
- Replies: 34
- Views: 16810
65XE boot issues
Hello again, Sorry it took a while. I'm not in the habit of checking a Forum very often. The value on pin 8 of MMU seems a bit low. This is a line from the cartridge connector to the MMU and has a 1K resistor to GND. And nothing more. It's the line RD5 and a cartridge may use that to disable Ram (an...
- Sun Jun 07, 2020 12:50 pm
- Forum: 8 BIT CORNER
- Topic: 65XE boot issues
- Replies: 34
- Views: 16810
65XE boot issues
Yes, you're right its only 20 pins for the MMU. OK, some more TTL logic. All voltages between 0 and 0,8V are logical zero. And depending on the exact logic family, anything abouve 3,5V is logic one. (Mostly, >4,8V is more common) In between is "not determined". (Can also be an active signa...