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How much z80 and how much 8080 ?
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
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
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
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
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
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
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
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
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
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., ...
