Reply 20760 of 21826, by Nexxen
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Deunan wrote on 2022-01-27, 14:22:Nexxen wrote on 2022-01-27, 14:00:30 yrs later...
Satisfaction comes slow but this one has truly a + on the scale 🤣
Could this bug affect performance overall, like slower benchmarks?Yup, pretty happy with this find, however useless it is these days.
Sadly it's not a performance thing, but it does have the potential to upset mixed 16- and 32-bit code, like for example programs/games using DOS extenders that have to exit back to real mode to call any OS functions like file access. I have yet to verify if TI clones of DLC chips also suffer from it, and what about "full-fat" 486 cores from Cyrix. If it turns out TI's do not have this bug it might explain why some games glitch or crash in FM Towns with CPU swapped for Cyrix (but not TI). FMT systems are pretty weird in how they constanly switch between real and protected mode to service various interrupts.
From my pov, that is a real issue. Ok, maybe FMT is the true suffer, but I have to ask if it was that difficult to spot by devs back then.
PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K