mirror of https://github.com/mgcaret/rom4x.git
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
; this was confirmed by measuring a delay loop
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; for each speed. The delay loop was timed
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; timed to 1/100 sec accuracy using the Ram
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; Express II+ dclock.
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.if ::spdpct
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; percent speed table for any IIc Plus/Zip Chip
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.byte %00000001,$00
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.byte %00100000,$83
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.byte %00010000,$80
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.byte %00001000,$75
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.byte %00000100,$67
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.byte %01000000,$50
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.byte %01100000,$42
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.byte %01010000,$40
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.byte %01001000,$38
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.byte %11000000,$33
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.byte %11100000,$28
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.byte %11010000,$27
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.byte %11001000,$25
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.byte %11000100,$22
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.byte %10100000,$21
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.byte %10010000,$20
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.byte %10001000,$19
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.byte %10000100,$17
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.else
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; MHz speed table for 4 MHz IIc Plus
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.byte %00000000,$00 ; 4.0000
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.byte %00100011,$33 ; 3.3333
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.byte %00010011,$20 ; 3.2000
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.byte %00001011,$00 ; 3.0000
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.byte %00000110,$67 ; 2.6667
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.byte %01000010,$00 ; 2.0000
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.byte %01100001,$67 ; 1.6667
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.byte %01010001,$60 ; 1.6000
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.byte %01001001,$50 ; 1.5000
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.byte %11000001,$33 ; 1.3333
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.byte %11100001,$11 ; 1.1111
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.byte %11010001,$07 ; 1.0667
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.byte %11001001,$00 ; 1.0000
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.byte %11000100,$89 ; 0.8889
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.byte %10100000,$83 ; 0.8333
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.byte %10010000,$80 ; 0.8000
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.byte %10001000,$75 ; 0.7500
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.byte %10000100,$67 ; 0.6667
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.endif
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