Hi folks,

I just got the motherboard in question - as per title, a Jetway J-435B; It works quite well, but I've noticed something odd - while it reports having 256KB of cache, both SpeedSys and Cachecheck only detect 128KB usable.

Now, my board looks almost exactly the same as the one pictured on the Retroweb -> https://theretroweb.com/motherboards/s/jetway-j-435#docs - Actually suspiciously the same, to the point is also has that weird two different tone cache chips AND even the date codes are exactly the same on ALL of the cache chips (9436 for the tag ram, 9431 for the bank 0 chips, 9412 for the bank 1 chips).

Is this board known to come with "half and half" fake cache? The chips marked "9412" look weird compared to the others, you can remove them and the board works exactly the same.
Even more interestingly, the manual mentions nothing about how to configure the cache jumpers - it mentions it can support various configurations, but it doesn't have anything about settings.

I also happen to have some spares - four 256k chips at 12ns that are known working (pulled from a different motherboard I upgraded ) along with their own tag ram chip. Tried swapping these out - the board doesn't even boot if I put them into Bank 1 (leaving the original H61256-20 on bank 0, not sure if this is expected due to the timing difference); It does some utterly weird crap if I install those, along with their tag ram chip, into bank 0 (leaving bank 1 empty). By "utterly weird crap" I mean the CPU performance in Speedsys fluctuates and sometimes it reports a "ghost" extra megabyte of video memory...