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poll:outrun for msx2

by PingPong on 31-05-2019, 22:44
Score: 149.47 %, Type: Forum topic , Comments: 122 comments
lines of the road, allowing turns and hills. What I would do is: Start at (x,y)=(0, 191) ... and 2K colour table directly, with the name table filled with 0..255. However updating 4K is still too ... pattern and colour table parts by changing bits 0-1 of r#4 and bits 5-6 of r#3. A little memory saving ...

To Grauw: Sprite colors linked to sprite pattern no.

by PingPong on 27-05-2019, 13:49
Score: 145.62 %, Type: Forum topic , Comments: 7 comments
A common critic about msx2 vdp sprites is that sprite colors are linked to sprite plane no instead of sprite pattern no. Before VRAM access timing was reengineered i always thought that is was not possible because of the need to calculate the SCT ...

What if V9938 never existed?

by PingPong on 18-05-2019, 18:48
Score: 145.55 %, Type: Forum topic , Comments: 58 comments
been - 32KB of VRAM - a Screen 0 mode with decent color support (8x8x2 colors) - a Simple gfx ... https://en.wikipedia.org/wiki/MSX#Evolution "Evolution MSX spawned four generations: MSX ( 1983 ), MSX2 ( 1985 ),[14] MSX2+ ( ... https://translate.google.it/translate?hl=&sl=it&tl=en&u=http... In this doc it is already pointed up how was the amiga sprite system weak when compared ...

VDP 8 bit VRAM ADDRESSING emulation issue

by PingPong on 09-05-2019, 19:44
Score: 147.37 %, Type: Forum topic , Comments: 12 comments
LO(ARG),HI(ARG)>>8 THE BASIC CODE CALLS 255 times the routine. Result: A stripe of 0x41 bytes written on the second 16K VRAM Bank of VDP at addresses beginning From 1. Please note: 1 not 0! as specified. That ... LD A,(0xF663) CP 2 JP NZ,0x406F LD HL,(0xF7F8) LD A,L DI OUT (0x99),A LD A,H NOP NOP NOP OUT (0 ...

R800 DMA...

by PingPong on 04-05-2019, 20:09
Score: 145.32 %, Type: Forum topic , Comments: 43 comments
instead of: ld a, l out (0x99),a ld a, h or 0x40 out (0x99),a became ld c, ... will need to change VDP R15 in order to read either status register S0 and S1. So _ANY_ non-interrupt code ... is extremely slower, in the best case you need 2us to perform a memory access (page 0). OK, the out on z80 ...
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