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212px ?

by PingPong on 15-01-2019, 21:13
Score: 142.55 %, Type: Forum topic , Comments: 3 comments
in # FFE8. If bit 7 is at 1 we have 212 vertical points, and if it is at 0 it will be 192 vertical ...

BLOAD " " ,S

by PingPong on 15-02-2019, 09:43
Score: 143.03 %, Type: Forum topic , Comments: 3 comments
Just a quick question. BLOAD load a binary file into memory. can load from tape, disk, or other devices. however when working with disks it also have a ",S" options to load into vram. this is not available on cas for example. the ...

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 ...

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) ...

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 ...

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 ...

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 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 ...

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

by PingPong on 11-06-2019, 01:20
Score: 145.35 %, 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 ...
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