Z64K developer William McCabe has been working hard updating Z64K and has reached a 2.1.2 release – [Build 20240327.0347]
The following changes have been made since I last reported in June of 2023.
2024
27 March
- series of Z80 EI instructions cannot be interrupted,
2 February
- Improved timing of switching between C128 Z80/8502. All tests behave like real hardware as discussed at  Using CIA timer to measure the duration of Z80<>8502 switch | Commodore 128 (freeforums.net)
30 January
- Timing improvements when switching between C128 Z80/8502. Results match real hardware for the majority of thetests discussed at Using CIA timer to measure the duration of Z80<>8502 switch | Commodore 128 (freeforums.net)
29 January
- Minor timing fix for C128 writing to Z80 port. Stableses lines and confirmed they match real hardware for z80rastertimingtest.prg as discussed at https://sourceforge.net/p/vice-emu/bugs/1979/
2023
26 November
- Enable tape record for VIC 20
