@redrumloa: It's my understanding that the Z80 still runs slower - possibly via waitstates - when the VIC-II is enabled. To quote wikipedia:
From the source code of the C128 CP/M implementation, it is clear that the engineers originally planned to make it possible to run CP/M in the "fast" mode as well, with the 40-column output turned off and the Z80 running at an effective 4 MHz; however, this feature did not correctly function on the first generation C128 hardware.
You are partially correct. There are simple modifications to make CP/M faster on the 128, like turning off the VIC-II. CP/M runs on the built in Z80 CPU, which there is no slow/fast mode for though like the native 8502 CPU.
CP/M on the 128 was pretty quick on a 1571 or 1581. Especially if you had the small program that turned off the VIC-II and shifted the machine into fast mode (which it doesn't seem like this video uses).
What's the drive? Verry speedly. 1571?
jocika99 2 months ago
still have the real thing with cpm disks
helipilot727 2 months ago
Still have one, but unfortunately without an floppy disc reader.
AORCrazy 9 months ago
Nope. That's a disk status/track counter, not an FPS display. It's part of CP/M Plus on the 128.
TheKid965 11 months ago
@shadowboxer777 This is a native C128 CP/M feature!
".com" lol
polluks2 1 year ago
@redrumloa: It's my understanding that the Z80 still runs slower - possibly via waitstates - when the VIC-II is enabled. To quote wikipedia:
From the source code of the C128 CP/M implementation, it is clear that the engineers originally planned to make it possible to run CP/M in the "fast" mode as well, with the 40-column output turned off and the Z80 running at an effective 4 MHz; however, this feature did not correctly function on the first generation C128 hardware.
localhbci 1 year ago
@localhbci
You are partially correct. There are simple modifications to make CP/M faster on the 128, like turning off the VIC-II. CP/M runs on the built in Z80 CPU, which there is no slow/fast mode for though like the native 8502 CPU.
redrumloa 1 year ago
@joecassara
Actually I thought the disk access in this video looked rather *slow* compared to a real 128 with 1571 or 1581.
redrumloa 1 year ago
CP/M on the 128 was pretty quick on a 1571 or 1581. Especially if you had the small program that turned off the VIC-II and shifted the machine into fast mode (which it doesn't seem like this video uses).
localhbci 1 year ago
That's not my question. I'm asking him if he's running the emulated CPU faster than 100%.
joecassara 2 years ago