alanh@logitek.co.uk (Alan Hourihane) (01/16/91)
Hello Internet, Has anyone bought AT Speed ? Has anyone got true protected Mode programs to work ? What I have is AT Speed V2.21 and V2.24. I know Windows 3 works in Standard Mode, but this is the only program I have found to do this. I have a 4 Megabyte Machine, 48 Meg Hard disk and I am trying to run a few DOS programs that switch the processor into protected mode, also I am trying to boot from an OS/2 install disk which hangs the system after loading the file OS2KRNL and finally XENIX which hangs when determining the System components, i.e. memory size , ports available etc. Anybody know Hans-Sack email address ? Or has anybody else experienced this and know a fix ? Any comments at all much appreciated. Either post to news or email me at : alanh@logitek.co.uk
alanh@logitek.co.uk (Alan Hourihane) (01/29/91)
Remember AT Speed & Protected Mode. Well, it looks as though I have found the problem. In the AT Speed manuals, it says it supports BIOS functions 87HEX and 88HEX via the INT15 call, These calls relate to shifting blocks of memory especially into extended (i.e. above 1 Meg). To switch the processor into protected mode the function call 89HEX is made via INT15 again. This in turn crashes AT Speed. With 87HEX and 88HEX it does not switch the 286 into protected mode, but passes some code onto the 68000 to shift the block of memory, rather than get the 286 to do it. This is also why windows 3 works because it only uses calls 87 and 88. So, any program out there which works under DOS and switches the processor into protected mode via function call 89HEX will crash, subsequently OS/2 and XENIX will not function either. Therefore the features of AT Speed over PC Speed, that I can only see is the Speed increase from 4.4 to 6.7(Norton Factor). CAN ANYBODY FIX THIS ?????????? Thanks. e-mail:alanh@logitek.co.uk