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MSX2+ - Sony hbf1xd Upgrade

mbliss11

Experienced Member
Joined
Oct 31, 2022
Messages
249
Location
Maryland
Documenting my upgrade attempts of a Sony MSX HBF1XD to an MSX2+ capable machine. This involves replacing the vdp on the board with an upgraded version (9958) and replacing rom. There is also a latch upgrade that can be performed as well.

All chips came off the board smoothly and socket came in for the vdp yesterday. Put new chip in and a few bodge wires later and it works….kinda. MSX software that is supposed to detect an upgraded VDP does not appear to. Additionally software specifically made for the MSX2+ series looks….interesting….

Have a new VDP on order and will try it out hoping it’s just a bad chip and I didn’t Bork anything up. Pics attached. I am also on msx.org with a thread in there they don’t have capabilities of easily posting pics.
 

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Users on msx forum were saying they were getting similar behavior on a 9938. I scoped pin 21 out of socket which would have been composite video but was just getting solid 5v which suggests it’s not a 38. That would have been the first fake chip I have gotten. Who knows could still be fake but I am thinking it could just be faulty.

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