Fountain 286 Computer Slows After MS-DOS 5 Upgrade (76817)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
This article was previously published under Q76817
The Fountain 286 8/12 MHz computer will perform at 8 MHz after the
installation of MS-DOS 5 Upgrade. HIMEM.SYS, which is added to the
CONFIG.SYS file during MS-DOS 5.0 setup, may be causing the reduced
To correct this problem, use the MACHINE:12 switch and set the
CPUCLOCK switch to On with the HIMEM.SYS driver.
The following syntax should be used for the device driver HIMEM.SYS
in the CONFIG.SYS file:
device=[drive:][path]himem.sys /machine:12 /cpuclock:on
This will enable A20 handler number 12, instead of the default number
1, and allow the CPU clock to affect the processing speed of
HIMEM.SYS. Note: Though the computer's processing speed may increase,
XMS access speed may decrease.
The product included here is manufactured by vendors independent of
Microsoft; we make no warranty, implied or otherwise, regarding this
product's performance or reliability.
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