Not MMU, but EMMU. This is how 130XE (ECI) boards were configured for 65XE/800XE computers.
You could also replace the MMU, with another one or a programmed GAL replacement.
Search found 256 matches
- Tue Dec 22, 2020 2:13 pm
- Forum: 8 BIT CORNER
- Topic: A little bit of 8 Bit: 65XE upgrade to 128k RAM
- Replies: 65
- Views: 11760
- Mon Dec 21, 2020 2:18 pm
- Forum: 8 BIT CORNER
- Topic: A little bit of 8 Bit: 65XE upgrade to 128k RAM
- Replies: 65
- Views: 11760
Re: A little bit of 8 Bit: 65XE upgrade to 128k RAM
These "resistors" mounted instead of EMMU are just jumpers (0 Ohm).
- Sun Dec 20, 2020 12:34 pm
- Forum: 8 BIT CORNER
- Topic: A little bit of 8 Bit: 65XE upgrade to 128k RAM
- Replies: 65
- Views: 11760
Re: A little bit of 8 Bit: 65XE upgrade to 128k RAM
Try to remove EMMU and cross-wire its socket, so the computer would behave as it had only 64 kB of RAM, and if it doesn't help, try to substitute MMU with another one or a GAL replacement (in 800 XL it was a PAL chip, so GAL replacement is 100% compatible).
- Sat Dec 19, 2020 10:58 pm
- Forum: 8 BIT CORNER
- Topic: A little bit of 8 Bit: 65XE upgrade to 128k RAM
- Replies: 65
- Views: 11760
Re: A little bit of 8 Bit: 65XE upgrade to 128k RAM
I prefer this test for extended RAM:
https://satantronic.com/files/8bit/tools/XRAM0220.XEX
https://satantronic.com/files/8bit/tools/XRAM0220.XEX
- Sat Dec 19, 2020 3:29 pm
- Forum: 8 BIT CORNER
- Topic: A little bit of 8 Bit: 65XE upgrade to 128k RAM
- Replies: 65
- Views: 11760
Re: A little bit of 8 Bit: 65XE upgrade to 128k RAM
Ok, I own any TMS4164-15NL, are they compatible with the first bank (42164-15) ? By markings, they are ok, but these chips look suspicious to me. Like they were sanded and re-engraved. Do they come from Aliexpress? I had similar glitches in my 800XL, and it was a faulty ANTIC chip (it was working c...
- Wed Dec 16, 2020 10:14 am
- Forum: ELECTRONICS
- Topic: 4 channel scope recommendations ?
- Replies: 19
- Views: 817
Re: 4 channel scope recommendations ?
If you want to observe just repetitive analog signals, then time equivalent sampling is ok, but if you want to catch a glitch in a digital signal, that occurs once in a few thousands (or more) cycles, then deep memory, and high real time sampling are crucial things to have. This old HP is just "deaf...
- Tue Dec 15, 2020 10:35 pm
- Forum: ELECTRONICS
- Topic: 4 channel scope recommendations ?
- Replies: 19
- Views: 817
Re: 4 channel scope recommendations ?
I remember those HP scopes from school, but for today's standards 54602B really isn't impressive. It is only 20 MSa/s, and for most time is working in time equivalent sampling. Its effective bandwidth for real time sampling is about 5 MHz, and has almost no memory (just 4 kPts). The entry level mode...
- Tue Dec 15, 2020 11:42 am
- Forum: EXXOS WEBSTORE INFORMATION
- Topic: VAT charges to EU states
- Replies: 50
- Views: 2390
Re: VAT charges to EU states
Graphics seem to be correct - within the EU, it is the seller (you) who pays VAT, and there are no custom fees. As for now, when you export goods from the non-EU to the EU countries, the VAT and customs fee are paid (or not) by the importer in the destination country. It is about to be changed, and ...
- Thu Dec 10, 2020 11:28 pm
- Forum: HARDWARE DISCUSSIONS
- Topic: Floppy 14-pin DIN Info
- Replies: 6
- Views: 388
Re: Floppy 14-pin DIN Info
I've printed some of these plugs, and they fit perfectly ok.
- Thu Dec 10, 2020 3:47 pm
- Forum: HARDWARE DISCUSSIONS
- Topic: Floppy 14-pin DIN Info
- Replies: 6
- Views: 388
Re: Floppy 14-pin DIN Info
My drawings are from "the nature", the dimensions are not super precise, especially the angles.