You can buy most of the yamaha chips online, much cheaper and less sacrilegious do the math an msx2 costs about 100 euros or so depending on shipping nowadays..
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 ?
have you already designed a PCB with the V9958 on it ?
no. So no experience with that
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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.
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.