Author
| T6950 VDP chip
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[WYZ]
msx lover
Posts: 94 |  Posted: May 18 2004, 13:22 |
It 's equivalent to TMS9918A chip.
I would like to get some info about this MSX compatible VDP,
because I founded some differences with TMS9918A (or TMS9928A or TMS9929A) videoprocessor writing direcltly to port ( OUTI ot OTIR). Graphics seem to be displaced on VRAM.
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pitpan
msx master
Posts: 1368 | Posted: May 18 2004, 17:56 |
As soon as you get more details, please tell me, WYZ. I am interested in TMS9918 and variants, because I do not need V9938/58/90 supersets. By the way, some tricks are not compatible between different chips, as you already know.
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 02:59 |
Do you have datasheet on it?
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[WYZ]
msx lover
Posts: 94 | Posted: May 19 2004, 12:36 |
I'm searching for TMS9118a data manual / register description too. This is the next generation after TMS9918a family and it is used on Coleco Vision and some MSX1.
"The 9118/9128/9129 VDP's are the succesors of the 9918A/9928A/9929A VDP's.
These new chips have improved memory addressing circutry which allows the
interface of either 8 TMS4116 (2k) or 2 TMS4416 (8K) dynamic RAMs."
- 9118 looses GROMCLK pin.
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 15:47 |
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pitpan
msx master
Posts: 1368 | Posted: May 19 2004, 15:57 |
Note the difference: WYZ is asking for 9118, not for 9918.
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 16:01 |
My bad...
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 16:28 |
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 16:32 |
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 16:36 |
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GuyveR800
msx guru
Posts: 3048 | Posted: May 19 2004, 17:50 |
Funny how that last article claims the V9938 was used in Sega Mastersystem and the V9958 in the Genesis/Megadrive 
Ofcourse neither is not true.
The VDP Sega used in the Mastersystem is a pattern-mode evolution of the TMS9918, while the Yamaha V9938 is a bitmap-mode evolution.
The VDP in the Genesis/Megadrive is an evolution of the Mastersystem VDP, with no relation to the V9958 whatsoever.
I've never heard about the YM2701 and YM2703 part numbers, are these actually correct? |
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 17:53 |
No idea, google search for YM2703 brings nothing but this article...
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flyguille
msx master
Posts: 1183 | Posted: May 19 2004, 18:19 |
The V9938 and V9958 chips are in the $30-40 range, with the V9958 about $3 more
than the V9938. However, dealers only know them by the Yamaha part numbers
{YM2701 and YM2703.
oh!!!!, is possible to buy now?
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Sonic_aka_T
msx guru
Posts: 2261 | Posted: May 19 2004, 20:12 |
Sure, there's still some stock with the odd hardware reseller. Just do a search online to see who says they carry it. One of them is bound to actually have them... And then there was an offer of 4 or 5 V9958's on this forum not one week ago. They even had a couple of V9990's to offer.
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dhau
msx master
Posts: 1047 | Posted: May 19 2004, 20:46 |
Quote:
| And then there was an offer of 4 or 5 V9958's on this forum not one week ago. They even had a couple of V9990's to offer.
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Lol, it was 9918, 9938 and 9990. Ikeda doesn't have 99 58 |
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