Interesting Z80 mod

[xlar54]

Double the Z80 clock speed in your Commodore 128 (youtube.com)

[Blacklord]

Coupled with the CPM Fast binaries (in 80 col mode) this would make the 128D a rather useful CP/M machine.

[BigDumbDinosaur]

Coupled with the CPM Fast binaries (in 80 col mode) this would make the 128D a rather useful CP/M machine.

Way back when I first hooked up my C-128Ds (two of them) to the Lt. Kernal, I created a CP/M logical unit on the Lt. Kernal and ran CP/M from it.  It ran light-years faster than from the 1571, which was not unexpected, given that CP/M tends to be disk-intensive and is saddled with an inefficient filesystem.

CP/M on the 128, as a whole, is poorly-implemented, due to the constant switching between the Z80 and the 8502 during I/O operations.  While its performance was adequate in the Lt. Kernal environment, I never considered CP/M operation on the 128 as a viable environment for software development.  The 128D running natively on the Lt. Kernal was faster and had access to Lt. Kernal DOS features that weren't available in CP/M mode.

On a different subject, I tried to restore some images to one of my posts from long ago, without success.  I was able to upload the images, but they aren't visible.