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Proper VDP Vblank interrupt handling when there are others source of interrupt active

by PingPong on 11-06-2019, 01:20
Score: 145.34 %, Type: Forum topic , Comments: 20 comments
check if int is coming by VDP by reading S#0 the VDP request an interrupt. 3) because reading S#0 ... when the z80 does in a,(99h) the VDP issue its own request. But Because we are reading the register S#0 ... the CPU can read S#0 and be able to detect VDP int. is there any other way? I don't see any ...

VDP Sprite overflow bit and polling

by PingPong on 04-06-2019, 12:23
Score: 145.17 %, Type: Forum topic , Comments: 1 comment
Hi, it is known that when one read the VDP status reg 0 the v. interrupt bit is cleared. ... another sprite overflow situation, reading the S#0 on line 151 do i report the first overflow at line 50, or the second occouring at line 150 ? In others words do the s#0 read reset the sprite overflow bit and make ...

poll:outrun for msx2

by PingPong on 31-05-2019, 22:44
Score: 149.06 %, 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: 145.21 %, 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: 145.15 %, 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: 146.96 %, 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: 144.91 %, 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 ...

why so much load ways?

by PingPong on 20-03-2019, 12:56
Score: 143.84 %, Type: Forum topic , Comments: 5 comments
"",1,0 Tape, first file is code: LOAD "",1,1 Disk, intended 'first' file is BASIC: LOAD "*",8,0 Disk, intended 'first' file is code: LOAD "*",8,1 ...

msx bios

by PingPong on 10-03-2019, 14:43
Score: 143.63 %, Type: Forum topic , Comments: 2 comments
4x longer to run on MSX2 when compared to MSX1: 10 TIME=0 20 COLOR 15,0,0 30 SCREEN 3 40 OPEN"GRP:" FOR OUTPUT AS #1 50 FOR I=2 TO 15 60 PSET (0,0),0 70 COLOR I:PRINT#1,"Hello..." 80 NEXT I 90 SCREEN 0 100 PRINTTIME (General discussion) ...

openMSX 0.15 bug

by PingPong on 15-02-2019, 19:11
Score: 143.1 %, Type: Forum topic , Comments: 8 comments
boot in screen 0. It does boot but i get corruption in pattern name table I've also got ... mapper type was added to openMSX 0.15.0, so it should be recognized. I would first recommend ... no change at all... Very Very Very bad thing i've downgraded to 0.13 (that i knew ran without issues ...
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