Post #721458
2026-03-22 14:50 UTC
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
Replies (1)
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@mikael@hachyderm.io 2026-03-22 15:03
Responding to myself: Looks like this is one of the fixes in firmware version 3.14d. (https://ultimate64.com/Firmware). Looks like that one doesn’t include the KERNAL and stuff which comes prepackaged in the official FW. But then there is hope.