Newer Epson Computers Use A20 Handler 1 with HIMEM.SYS (78438)


The information in this article applies to:

  • Microsoft MS-DOS operating system 5.0
  • Microsoft MS-DOS operating system 5.0a
  • Microsoft MS-DOS operating system 6.0
  • Microsoft MS-DOS operating system 6.2
  • Microsoft MS-DOS operating system 6.21
  • Microsoft MS-DOS operating system 6.22
This article was previously published under Q78438

SUMMARY

According to Epson, older Epson computers require various different A20 handlers (machine switches) with the HIMEM.SYS device driver. More recent Epson computers use A20 handler number 1.

MORE INFORMATION

The following computers use the HIMEM.SYS driver with an A20 handler (machine switch) of one (/M:1):

  • Epson Equity 286 Plus
  • Epson Equity 386SX Plus
  • Epson Equity 386SX/20 Plus
  • Epson Equity 386/25 Plus
HIMEM.SYS is loaded through the CONFIG.SYS file as follows: 
   device=<drive>:\<dir>\himem.sys

-or- 

   device=<drive>:\<dir>\himem.sys /m:1
where <drive> and <dir> are the drive and directory location of the HIMEM.SYS file (typically C:\DOS).

The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.
Modification Type:MajorLast Reviewed:5/12/2003
Keywords:KB78438
©2002 Microsoft Corporation. All rights reserved.