Posted By
gerliczer
on 2019-10-31
11:11:09
|  Re: cpu speed ntsc double clock blank
The double clock bit enables TED to run the CPU at high clock speed. If you turn double clock on TED automatically doubles the speed (~1.7 MHz) in the borders. If you turn it off TED is continuously slows down the processor with low clock (~0.9 Mhz), no matter if in the display area or in the border. Clock speed switching needs no intervention on the running program's part.
I do know what happens on a PAL machine when you switch it to NTSC standard.
This may help: http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/plus4/Plus_4_Technical_Docs.pdf
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