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Posted By

Litwr
on 2016-01-08
11:36:07
 Re: A mathematical demo

Sorry I can't understand your point. Don't you believe in 1.92 sec with Plus4/PAL? We may ask Luca to check it. I can only repeat that the NTSC setting for Plus4/NTSC is senseless - so as the editing the line 120. Plus4/NTSC can't reach 1.92 secs, it has hardware limit to 2.41 secs. Maybe 1-2% better with no interrupts. Plus4/NTSC is not faster it is slower - unlike c64/NTSC which is faster than C64/PAL. Plus4/NTSC CPU is 1% faster than Plus4/PAL only in the screen blank mode but more frequent raster interrupts make Plus4/NTSC slower even in this case. BTW Plus4/NTSC is 10% slower than Plus4/PAL with the screen on.
[The news]
I upgraded and gave version 1 to this demo. The results for 1000 π-digits
Commodore 64/PAL - 331 s,
Commodore 64/NTSC - 319 s,
Commodore 128/PAL - 175.5 s,
Commodore +4/PAL - 152.3 s,
Amstrad CPC6128 - 179.3 s,
IBM PC 8150 (1981, CGA) - 76.6 s.
Commodore +4 version may calculate up to 7680 digits, Commodore 64 - 6320, Commodore 128 - 5008, Amstrad CPC6128 - 5536, IBM PC 8150 - 9000. These number may be increased for Commodore 64/128 but this requires a bit tricky memory management. Amstrad CPC version for CP/M may reach up to 8600 digits.



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