CPU Speed - Plus/4 Encyclopedia



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CPU Speed

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Hardware

Topic

Crystal	$FF07 #6	$FF06 #4	$FF13 #1	FPS	TED freq	CPU freq	% PALC64
PAL	PAL	TRUE	FALSE	49.78098	1,773,448	1,145,361	116%
PAL	PAL	TRUE	TRUE	49.78098	1,773,448	778,276	79%
PAL	PAL	FALSE	FALSE	49.78098	1,773,448	1,692,952	172%
PAL	PAL	FALSE	TRUE	49.78098	1,773,448	885,305	90%
PAL	NTSC	TRUE	FALSE	74.07884	2,216,809	1,300,676	132%
PAL	NTSC	TRUE	TRUE	74.07884	2,216,809	947,024	96%
PAL	NTSC	FALSE	FALSE	74.07884	2,216,809	2,115,544	215%
PAL	NTSC	FALSE	TRUE	74.07884	2,216,809	1,106,293	112%
NTSC	PAL	TRUE	FALSE	40.19138	1,431,818	924,723	94%
NTSC	PAL	TRUE	TRUE	40.19138	1,431,818	628,352	64%
NTSC	PAL	FALSE	FALSE	40.19138	1,431,818	1,366,829	139%
NTSC	PAL	FALSE	TRUE	40.19138	1,431,818	714,764	73%
NTSC	NTSC	TRUE	FALSE	59.8086	1,789,773	1,050,119	107%
NTSC	NTSC	TRUE	TRUE	59.8086	1,789,773	764,593	78%
NTSC	NTSC	FALSE	FALSE	59.8086	1,789,773	1,708,014	173%
NTSC	NTSC	FALSE	TRUE	59.8086	1,789,773	893,182	91%

Same table with monospaced formatting:


Crystal   $FF07 #6  $FF06 #4  $FF13 #1     FPS    TED freq  CPU freq  % PALC64
---------+---------+---------+---------+---------+---------+---------+---------
PAL       PAL       TRUE      FALSE     49.78098  1,773,448 1,145,361      116%
PAL       PAL       TRUE      TRUE      49.78098  1,773,448   778,276       79%
PAL       PAL       FALSE     FALSE     49.78098  1,773,448 1,692,952      172%
PAL       PAL       FALSE     TRUE      49.78098  1,773,448   885,305       90%
PAL       NTSC      TRUE      FALSE     74.07884  2,216,809 1,300,676      132%
PAL       NTSC      TRUE      TRUE      74.07884  2,216,809   947,024       96%
PAL       NTSC      FALSE     FALSE     74.07884  2,216,809 2,115,544      215%
PAL       NTSC      FALSE     TRUE      74.07884  2,216,809 1,106,293      112%
NTSC      PAL       TRUE      FALSE     40.19138  1,431,818   924,723       94%
NTSC      PAL       TRUE      TRUE      40.19138  1,431,818   628,352       64%
NTSC      PAL       FALSE     FALSE     40.19138  1,431,818 1,366,829      139%
NTSC      PAL       FALSE     TRUE      40.19138  1,431,818   714,764       73%
NTSC      NTSC      TRUE      FALSE     59.8086   1,789,773 1,050,119      107%
NTSC      NTSC      TRUE      TRUE      59.8086   1,789,773   764,593       78%
NTSC      NTSC      FALSE     FALSE     59.8086   1,789,773 1,708,014      173%
NTSC      NTSC      FALSE     TRUE      59.8086   1,789,773   893,182       91%

CPU frequencies in modes where the display enable ("border") bit is is set are lowest guaranteed. Actual frequencies can be 1-3 cycles more per bad/DMA line depending on whether or not the CPU is executing write cycles. This has a theoretical upside potential of an additional 50 × 3 = 150 cycles per frame. The reference C64 CPU frequency is the maximum frequency with all - character as well as sprite - DMA off.