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How much z80 and how much 8080 ?

by PingPong on 20-09-2019, 14:27
Score: 146.79 %, Type: Forum topic , Comments: 2 comments
Hi all. To those have put more in contact with BIOS and MSX-BASIC in MSX's ROMs how much old 8080 code is here? had M$ Guys took the idea of using z80 instructions to take advantage of z80? What about CP/M? I think this explains I ...

POLL: AVDP from texas

by PingPong on 03-09-2019, 11:10
Score: 146.59 %, Type: Forum topic , Comments: 33 comments
(16 different combinations) 0 xFh ... things. With the amount of 12 K VRAM TMS could get a bitmap mode like amstrad CPC mode 0. Instead got ... hypothetical alternative : (set vram ptr for write) ld a, l out (0x99),l ld a, h out (0x9A),h ld ...

Fastest way to test

by PingPong on 26-08-2019, 20:11
Score: 146.52 %, 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: 146.34 %, 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: 146.34 %, 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: 146.24 %, 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: 146.11 %, Type: Forum topic , Comments: 15 comments
in XSpelunker https://www.youtube.com/watch?v=OaTt0T8O0N0 So? What is the point of this So? ...

Msx basic grammar

by PingPong on 31-07-2019, 11:05
Score: 145.94 %, Type: Forum topic , Comments: 0 comments
Is there a official grammar description of msx basic language in bnf form? (Development) ...

poll:MSX weakness

by PingPong on 12-07-2019, 21:30
Score: 145.8 %, Type: Forum topic , Comments: 31 comments
MSX was a decent and quite successful system in the era of 8 bit wars. However, i think could be a lot successfull. The reasons ( not marketing ones ) where for me those, listed by generations: MSX: Lack of hw scrolling on VDP, Too much limited ...

V9990 & tilemap scrolling

by PingPong on 02-07-2019, 14:04
Score: 145.72 %, Type: Forum topic , Comments: 29 comments
http://msxbanzai.tni.nl/v9990/manual.html Physical mapping: Addresses 00000-3FFFF in VRAM0 and 40000-7FFFF in VRAM1. P1. 00000-3FDFF ... Pattern Data is layed out like a 4bpp bitmap with 256 pixel width, cut up in 8x8 patterns. Pattern 0 1st line starts at 00000, Pattern 0 2nd line starts at 00080 etc., Pattern 1 1st line starts at 00004 etc., ...
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