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Unknown VDP: Yamaha YM2220

by Piter Punk on 26-04-2019, 20:20
Score: 146.29 %, Type: Forum topic , Comments: 37 comments
Hi, I bought a Victor HC-30 , supposedly an MSX1 with a V9938 VDP and 16KB VRAM, ... with the V9938 or V9958. So, I removed the metallic shield and saw that the VDP isn't (as supposed ... but there people guessed that YM2220 was V9938 related, probably because it uses the same package. For ...

V9958 black and white picture

by ddehaan on 08-02-2023, 14:40
Score: 146.17 %, Type: Forum topic , Comments: 13 comments
(R,G,B) with an oscilloscope and the signals look the same as with a V9938, so it looks that the chip ...

Adjust register in games.

by PingPong on 10-12-2022, 18:01
Score: 145.06 %, Type: Forum topic , Comments: 74 comments
Hi, all. As we know v9938 lacks true circular scroll register for X axis. However adjust ... topic should talk about V9938 games, why it became a "colecovision games are done better than msx ... thegeps wrote: "Adjust register in games" This topic should talk about V9938 games ...

VRAM Maps

by mars2000you on 11-08-2022, 09:24
Score: 144.5 %, Type: wiki , Comments: 0 comments
None V9938 & V9958 Graphic 1 24 x 32 characters of 8 x 8 16 (2 per character) Mode 1 All ... Mode 1 All VDPs Graphic 3 256 x 192 16 (2 each line of a tile) Mode 2 V9938 & V9958 Graphic 4 256 x 212 16 Mode 2 V9938 & V9958 Graphic 5 512 x 212 4 Mode 2 V9938 & V9958 ...

Omega, no video.

by MrSiggler on 08-12-2022, 06:08
Score: 144.28 %, Type: Forum topic , Comments: 5 comments
is using a working MSX2+ to test it. Did you selected the VDP jumpers at V9938 or at v9958 position? I ...

V9990 tech demo: Twinbee on steroids

by snout on 11-06-2016, 11:03
Score: 144.13 %, Type: News post , Comments: 15 comments
sprites beauty even v9938 can do. may be smooth scroll was doable even on msx1 tms... v9990 can do FAR ... in public. Getting back on topic: So probably it can indeed be done on V9938 as well, but developing ... are possible in V9938. Anyway, it's just a proof of concept and to me it looks really promising. Go ...

any idea what is wrong with the unrolled loop?

by xchip on 09-04-2022, 15:18
Score: 144 %, Type: Forum topic , Comments: 19 comments
level of technical detail on the internal mechanism here: V9938 VRAM timings V9938 VRAM timings, part II It’s about V9938 but also goes into TMS9918, and the concepts are similar. I’m ...

Undestanding H.KEYI and H.TIMI

by Metalion on 25-05-2020, 12:37
Score: 143.06 %, Type: Forum topic , Comments: 6 comments
hook to handle a line interrupt on V9938 ? If the H.TIMI is only called on VBLANK, I'm guessing ... by another interrupt generated by the VDP (on V9938) ? I'm trying to make a screensplit work ... a macro) nop in a,(v9938.reg) rra call c,split.hblank Correct ? And change back so s#0 And ...

TMS9918 designer

by karloch on 19-05-2018, 02:30
Score: 142.85 %, Type: Forum topic , Comments: 2 comments
and 6502 were both used with the 9918). Ascii Microsoft came out with the V9938 what was developed ... and the DRAMs had gotten faster. Compare the V9938 ( ... Microsoft came out with the V9938 what was developed by Yamaha and my understanding is a slightly customized ...

v99c37 ??

by Leo on 15-05-2010, 16:46
Score: 142.81 %, Type: Forum topic , Comments: 3 comments
hi, anyone knows the vcp ( video display co processor ) v99c37 ,was it included in v9938 ... be written through v9938 bus ... i suspect v9958 as it included with the yjk/yae modes ... where ... of page of : http://ja.wikipedia.org/wiki/V9938 and end of page of : ...
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