3 ms·
Just like FAST on a commodore 128, it would run at 2 MHz instead of 1, and the screen went black. To go back to 1MHz, you would use the SLOW command IIRC
by RmDen 9y ago
Just like FAST on a commodore 128, it would run at 2 MHz instead of 1, and the screen went black. To go back to 1MHz, you would use the SLOW command IIRC
- vidarh 9y agoThat was a bit different in that the CPU clock frequency was actually changed. The screen blanking in that instance was because the VIC-II could only run at 1MHz, so the screen would get messed up in 40 column mode if the CPU (and by extension the bus speed) was switched to 2MHz. You do get a speedup by just disabling the screen too on both the C64 and C128, though, as with the display on the VIC hogs a lot of memory bus cycles. That's a bit more similar to the situation on the Alto, except instead of different "hardware threads" they are separate chips and the VIC just has the ability to take control of the bus whenever it needs memory access.