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First post, by wbahnassi

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Happy new year everyone!

I'm trying to install Terminator 2029 from its original disks, and INSTALL.EXE causes an immediate machine restart. My CPU is Intel Xeon W3520 2.67GHz, so definitely not your good ol' 386 😀 However, I tried a VirtualBox DOS setup and resulted in the same behavior. Finally, DOSBox 0.74-3 also suffers the same.

I recall reading somewhere that this executable is using undocumented CPU instructions that weren't supported by later CPUs. I'm hoping someone here might have some insight or know of a patch... otherwise I can't see how I can install this game properly. I will have to revert to some pre-installed copy, which isn't the end of the world of course... but a man can at least hope? 😀

Best!

Reply 1 of 5, by lafoxxx

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Hello and Happy New Year!

Not exactly same game, but this might help I think

Edit the DOSBox configuration file.
Change cputype=auto to cputype=386_prefetch

(Source: https://www.pcgamingwiki.com/wiki/The_Terminator:_Rampage )

Reply 4 of 5, by wbahnassi

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Interesting. So like touch memory at some single location, wait a bit, then assume the whole cacheline is fetched, then write something on the same location bypassing the cache somehow, while whatever you read within the cacheline will be served from the cache? I'm interested to learn what would be the benefits from such a technique? (I do code myself so I find this intriguing)

Best!

Reply 5 of 5, by jmarsh

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For older CPUs it's not really a traditional instruction cache with multiple lines, but rather a very small queue that only holds the next few opcodes. Any jump or branch flushes it. Modifying code immediately before it gets executed without an intermediate jump or branch is usually an attempt at confusing a debugger or emulator.