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Mac PC Card and compatibility mode paging

Posted on 1999-01-08
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Last Modified: 2013-11-17
I have a Mac 7220/64 (OS8.1) with an Apple P166/16 (W95) PC compatibility card. The performance tab in the system control panel shows that the performance of the PC is being reduced by compatibility mode paging and that all drives are running MS DOS compatibility mode file systems. I've replaced all the drivers I can and I can't get rid of this problem. Any thoughts?
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Question by:mstearn
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Expert Comment

by:cdouglass
ID: 1537316
The PC cards I have used (Orange PC) loaded ASPI drivers on boot, which are not 32-Bit, and caused the same problems you describe. There was no way on those cards to remove the ASPI host driver and still get drive access. However, newer cards may not have the same issue. Look in the CONFIG.SYS of your DOS partition, and see if you have any lines that look similar to the following:
DEVICE=C:\WINDOWS\ASPI.SYS

Try to remove these lines and reboot. If you can't boot this way, you will have to replace the line and you'll pretty much be stuck. I've found VirtualPC to be every bit as good as a DOS card.
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Author Comment

by:mstearn
ID: 1537317
The only statements like this in config.sys are
DEVICE = C:WINDOWS\HIMEM.SYS
and
DEVICE= C:WINDOWS\EMM386.EXE NOEMS
I don't think these relate to my problem.

Thanks
Michael
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Expert Comment

by:cdouglass
ID: 1537318
What does your device manager show for Disk Controllers and/or SCSI devices?
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Author Comment

by:mstearn
ID: 1537319
As far as I can make out it doesn't seem to have any - a factor that has me well confused. I did what I thought was a standard installation using all the Apple supplied disks(including W95).

Thanks for you interest. Any other thoughts.

Michael
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Accepted Solution

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cdouglass earned 600 total points
ID: 1537320
From the Tech Info Library:
http://til.info.apple.com/techinfo.nsf/06e239ed35f6922486256495005b8d87/bb9bcdaec831632c8525659500688305?OpenDocument
"


     Windows 95 has the ability to use a 32-bit protected-mode driver to access
     the hard drive controller and other drive controllers. On some equipment,
     including the PC Compatibility Card, Windows 95 is unable to access the
     drive controllers in this mode, so Windows 95 must use 16-bit real-mode
     drivers. This is the Compatibility Mode that Windows 95 mentioned. Using
     the 16-bit real-mode is normal for the PC Compatibility Cards. Windows
     95 has the ability to use either 32-bit or 16-bit drivers, so this should not
     cause any problems.

     Note that some new Windows 95-only software may require 32-bit
     protected-mode drivers. Such software will not work with the PC
     Compatibility cards. Before troubleshooting any software issues in depth,
     check with the software vendor to verify whether 32-bit protected-mode
     drivers are required or not. Apple will not be providing 32-bit
     protected-mode drivers for the PC or DOS Compatibility cards."

Sorry Michael, can't get there from here.
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