which home computer has V9938 removable chip ?

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Par ivelegacy

Supporter (13)

Portrait de ivelegacy

13-01-2015, 00:15

hi
i am looking for a msx2 machine that has V9938 on dip socket in order to remove it and re-use for my purposes.

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Par syn

Prophet (2113)

Portrait de syn

13-01-2015, 00:34

You can buy most of the yamaha chips online, much cheaper and less sacrilegious Smile do the math an msx2 costs about 100 euros or so depending on shipping nowadays..

Par ivelegacy

Supporter (13)

Portrait de ivelegacy

13-01-2015, 00:47

do you mean on ebay ? or an somewhere else on the web ? let me know

the idea is to reuse the circuits around the chip, using a socket i can bypass the MSX2 cpu, entering in the mobo in order to control the VDU

i will re-create the whole hw around the V9938 chip (vram, analog part, and so on), but i'd like to experiment: i will create a little PCB with the VDU, VRAM, RGB-S, and a pretty interface for 8 bit @ 5V machine (or to 8 bit 3.3V fpga, using a voltage level buffer)

p.s. about msx2, are there any units which use RGB-S {Red, Green, Blue, Synchronism} instead of RGB-composite ?

Par flyguille

Prophet (3031)

Portrait de flyguille

13-01-2015, 02:24

why 9938., 9958 is easy to buy

Par Daemos

Paragon (2044)

Portrait de Daemos

13-01-2015, 08:58

ebay is completey overloaded with V99x8 chips. Take a look there.

Par ivelegacy

Supporter (13)

Portrait de ivelegacy

13-01-2015, 12:08

ebay dot it has less chip, also they seem from china X___X

btw, which machines used V9958 DIP64 socketed (just to know) ?

Par Daemos

Paragon (2044)

Portrait de Daemos

13-01-2015, 12:37

I have the china V9958 and it works just fine. Never had 1 graphics glitch.

Par ivelegacy

Supporter (13)

Portrait de ivelegacy

13-01-2015, 12:59

ok, i have sent a wtb (want to buy) request to this (1) chinese vintage chips broker Big smile

p.s.
have you already designed a PCB with the V9958 on it ?
or you are using the chip on a vintage home computer ?

(1) http://funkward-tech.ecrater.com

Par Daemos

Paragon (2044)

Portrait de Daemos

13-01-2015, 19:00

Quote:

have you already designed a PCB with the V9958 on it ?

no. So no experience with that

Quote:

or you are using the chip on a vintage home computer ?

yep on my NMS8255. I used it as an upgrade. Works perfectly. Only had to install a cap/resistor pair on the output of pin6 to make the sync 100% working.

Par st1mpy

Paladin (900)

Portrait de st1mpy

17-01-2015, 19:53

I think MSX2/2+ is too expensive for this kind of play. And, since it's a programmable computer already, you might as well program the vdp within/from MSX itself.
I would do something like this with a Sega master system.

Par ivelegacy

Supporter (13)

Portrait de ivelegacy

19-01-2015, 12:33

what does sega master system use as VDU, which chip ? also, is it DIP socketed ?

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