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Fastest way to test

by PingPong on 26-08-2019, 20:11
Score: 146.92 %, Type: Forum topic , Comments: 6 comments
Hi, what is the fastest way to test if after a logical bitwise operator the accumulator contains 255? Like this Ld a, 127 Or 128 Instead of cp 255 then jp or Jr what I could do? inc a and jr z,... inc a and jr z,... ...

Bios int handling

by PingPong on 21-08-2019, 12:34
Score: 146.74 %, Type: Forum topic , Comments: 15 comments
that there is a chance that the built in vdp could be lost because of the stupid autoreset feature of status reg 0 Do ... INT routine calls the Hook H.KEYI (0FD9AH) then reads the current status VDP register (must be 0 when an interruption occurs) and calls H.TIMI (0FD9FH) if the bit 7 is set. https://www.msx.org/wiki/System_hooks ...

help with SDCC and msx dos target

by PingPong on 19-08-2019, 19:18
Score: 146.75 %, Type: Forum topic , Comments: 17 comments
hi, all. time ago i've found this http://msx.atlantes.org/index_en ... a MSX-DOS library for SDCC. https://www.msx.org/news/development/en/fusion-c-is-available Free ... https://github.com/mvac7?tab=repositories http://msx.avelinoherrera.com http://msx.avelinoherrera.com/index_en ...

After the war fps

by PingPong on 17-08-2019, 22:52
Score: 146.65 %, Type: Forum topic , Comments: 0 comments
Hi Looking at after the war in both zx and msx version I didn't notice an appreciable difference in speed This make me think that the real cause in slow down when porting zx to msx games in not as a lot of people say the vdp port bottleneck ...

Partial 2/3 scrolling

by PingPong on 10-08-2019, 12:15
Score: 146.52 %, Type: Forum topic , Comments: 15 comments
in XSpelunker https://www.youtube.com/watch?v=OaTt0T8O0N0 So? What is the point of this So? ...
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