Responding to myself responding to myself:
I borrowed the KERNAL, Basic, and Char ROMs from a VICE installation, after which the updated #Ultimate64 booted up as expected. I can’t say for sure whether all issues are gone, but Mayhem in Monsterland, which would never load successfully with #JiffyDOS earlier on this machine started up like nothing; and Gunship, which would inevitably crash at an arbitrary point in loading, has come right up into flight mode. Awesome!
Experimenting with #JiffyDOS on my #Ultimate64 - it seems to be pretty hit-or-miss. The webpage had a note recommending what seems to be CIA timing settings:
> Can I utilize JiffyDOS on the Ultimate II?
>
> Yes. Customers have noted that settings PH1=140 and PH2=80 work well.
I don’t see any way of finding nor tuning these settings, though. Have I misunderstood something?
#c64 #c64ultimate #c64u
All you Ultimate 64 users come share your story and pictures of your build.
Here is mine:
My Aldi 64 Ultimate!
For my Ultimate 64 I wanted it to have a little bit of unique appeal like so many others have done....
[read more, click the link]
https://8bitboyz.com/messageboards/postid/866/
Oh yeah! I'm lovin the REST API:
Mikael Hansson
The Oasis BBS
8-Bit Boyz
C64WhizPUT /v1/machine:writemem?address=0277&data=52554e0d&address=00c6&data=04\r\n
HOST: 192.168.1.64\r\n
\r\n
You don't need to issue a single PUT for each RAM insertion, multiple pairs are totally valid! The above inserts chars on the keyboard buffer $0277 (631) and then the number of chars in $C6 (198). This allowed me to "type" on the U64 from my Linux box. I sent these via ncat and input redirection. The `\r\n' were the actual bytes ASCII 13 and 10, not escaped 'r' and 'n'.
(FWIW, this is on the earlier Ultimate 64 Elite board, not the new C64U.)
Ultimate 64, der Commodore 64 Ersatz - Einrichtung & Optimierung
Ein "Ultimate 64" ist in erster Linie ein vollwertiger C64 auf FPGA-Basis. Diese Einrichtungshinweise sind zum Teil auch auf den neuen "C64Ultimate" anwendbar.
https://www.creopard.de/2021/10/ultimate-64-commodore-ersatz-hinweise.htm
creopard