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Another strange VDP behavior?

by PingPong on 30-07-2022, 11:57
Score: 174.24 %, Type: Forum topic , Comments: 2 comments
Hi, all. Time ago, someone mentioned a issue about different vdp timings when performing a vram read. Basically: A) on TMS one can set up the vram ptr and then do a in on data port, reading the value without any delay B) it seems that V99x8 ...

Did every one tryed this?

by PingPong on 27-03-2022, 15:56
Score: 169.78 %, Type: Forum topic , Comments: 6 comments
Hi, all. As we know, computers using TMS vdp do they vram access through the VDP chip itself. this is said to be slow....... (even not so slow as most people complain about) From a tech point of view the VDP is similar to other video chips, it has a ...

hw sprites era end.

by PingPong on 26-03-2022, 19:04
Score: 169.84 %, Type: Forum topic , Comments: 13 comments
https://www.youtube.com/watch?v=A8LXC5tXb-Y . with a decent blitter one can do more flexible sprites than those provided by hw itself even if in the V9990 hw sprites are relatively good. I'd like to see the blitter I'd like ...

see this

by PingPong on 20-03-2022, 16:08
Score: 169.6 %, Type: Forum topic , Comments: 4 comments
https://www.youtube.com/watch?v=wMMAszLGB5w anyone had more info about this? Well, the music was made in Well, the music was made in MB by yours truly. There's a tiny little bit o' Titanic OST in the title screen. And ...

msxdos2 question

by PingPong on 02-03-2022, 18:41
Score: 169.14 %, Type: Forum topic , Comments: 17 comments
hi, all. i'm guessing why msx dos 2 need a cartridge while msx dos 1 not. Is there a special reason? is it feasible to have a msxdos2 all as as disk like msx dos1? Msx-dos functions are part of Msx-dos functions are part of the ...

Disk BIOS Speed

by PingPong on 12-01-2022, 23:13
Score: 167.83 %, Type: Forum topic , Comments: 3 comments
slower seek (mostly older), most use fastest seek Some have faster page 0 transfers (not using ... page0/page1 transfers Some have interrupts disabled longer Some have shorter motor spinup wait time Some ...

MSX and VRAM access speed: Is really so bad? what do you think?

by PingPong on 10-01-2022, 20:38
Score: 167.82 %, Type: Forum topic , Comments: 5 comments
write (not page 0 ) takes 3 cycles. So 3us. The same ballpark of a z80 in msx (you need also ... on average to be 2-3 cycles, so 0.5 to 1us leading to a LD a,(HL) requiring 9-10 t-states. - amstrad CPC ... in a operation like "OR 0x40". gdx wrote: And finally, the graphics commands are quite ...

if it's not a fake this is the most impressive PCM sound i've heard using the PSG

by PingPong on 08-01-2022, 15:15
Score: 167.73 %, Type: Forum topic , Comments: 13 comments
https://www.youtube.com/watch?v=ymFMhIbrDpw Well, it is 512 KB for 30 sec Well, it is 512 KB for 30 sec of recording. I think it is doable. I remember a program I've found on a magazine (in its cassette) when I was young... ehm, ...

TO Grauw (and others, of course): YASVL

by PingPong on 04-01-2022, 01:41
Score: 167.55 %, Type: Forum topic , Comments: 19 comments
when working, for example in screen 5, leaving page 0-1 free from sprite data. I think this behaviour ... to be on the lower 64K it's my responsability to keep them 0. By contrast, by forcing them to be 0 you remove me ...

Help: Screen 4 Wrong SAT Address?

by PingPong on 03-01-2022, 21:14
Score: 167.61 %, Type: Forum topic , Comments: 5 comments
Hi, all. when the VDP is set in screen 4 the r5 is set to 63 (dec) while the r11 to 0. If ... however the address is not correct: putting a sprite on plane 0 at 10,20 should show byte value 20 @ 8064 ... to 63 (dec) while the r11 to 0. If i've done the math correctly this should mean ...
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