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CPU error / Protected Mode
Name: Kya Nite Date: May 30, 2004 at 23:37:58 Pacific OS: DOS 7.10 CPU/Ram: 100Mhz / 32
Comment:
"CPU error: incorrect opcode. Killing process"
I get the same error message but I get it when I try to run an old DOS game.
The files shouldn't be corrupted, because the game runs fine with DOSbox under XP. My processor is not fast enough for DOSbox, though, so I want to run it in DOS 7.10.
DOSbox says it's for older games that need protected memory. Is there a way to create that protected memory / "protected mode" manually in DOS 7.10 ?
Name: Wengier Date: May 31, 2004 at 04:47:03 Pacific
Reply:
"CPU error" really means "Program runtime error" in this case.
To create protected memory / "protected mode", you need some sort of protect mode server, e.g. DPMI host/driver. Most DOS protected mode programs should come with this driver.
Note that some DOS programs will only work with certain configuration of EMM386 or so, e.g. EMM386 RAM (both UMB and EMS), EMM386 NOEMS, or no EMM386 (i.e. don't load EMM386).
Summary: On 386 and above, the CPU starts out in real mode. It can address only 1 meg of memory... with the exception of flat real mode, in which you go into protected mode, screw up some registers, go back in...
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