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#120574 03/08/22 08:09 PM
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Walker Offline OP
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While working on the PC1640 Wiki page and playing around with the device I've noticed that the pc1640 driver utilises the NEC V30 CPU emulation..

This is not original - the pc was delivered with an intel 8086 (I know as I had one 30 years ago and always wanted to buy the nec cpu but couldn't get ahold of it in the local shops).

Is it possible like with the isa bus devices to switch the cpu driver without having to recompile the driver?

Maybe a nice future feature request without too much sense, but this way it could be possible to add an 8087 optiional too?

Last edited by Walker; 03/08/22 08:11 PM.
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hi

for what i can see ic120 is attach to Intel 8086 @ 8.00 MHz with last mame buid

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I am easily confused to be fair, Maybe I saw ghosts when I looked at the sources.

Eitherway at startup Mame clearly says i8086 and not NEC V30 so the right one is probably configured in the driver.

Despite in mame 0.241 when checking the systeminfo with SystemInfo by Norton Utilities v1.0 I get really funny results:
[Linked Image from wiki.mamedev.org]

There is definitely something going bad with the si tool with this driver.

NEC V20 - I have no idea about the cpu check code being used in by Norton though, but an 8086 should return positive on the bus width test for 16 bit.

Last edited by Walker; 03/12/22 12:18 PM. Reason: typos

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