64 MB barrier

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Original Message

Name: Robert A
Date: June 8, 2003 at 09:33:06 Pacific
Subject: 64 MB barrier
OS: DOS 6
CPU/Ram: P4 / 512 MB

Comment:

Can anyone comment about a 64MB barrier in (hmmmm) straight DOS? My dual boot XP/DOS computer can only see 64MB when in DOS.

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Response Number 1

Name: x86
Date: June 8, 2003 at 10:40:29 Pacific

Reply:

That is correct up to MSDOS6.xx only 64MB is recognized, this was overcome in MSDOS7.xx. You could try using HIMEM.SYS from W98!

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Response Number 2

Name: Robert Anderson
Date: June 10, 2003 at 19:42:34 Pacific

Reply:

The Microsoft Knowledge Base Article - 95555 states: HIMEM.SYS implements all of the XMS except the optional UMB portion. HIMEM.SYS versions earlier than 3.0 are XMS 2.0 compliant and recognize up to 16 MB of RAM; versions 3.0 and later (first included with Windows 3.10 and MS-DOS 6.0) are XMS 3.0 compliant and recognize up to 4 GB. I have tried using HIMEM.SYS from W98 to no avail. Could it be particular to Dell [Dimension] computers? Dell told me to upgrade to flash bios A06 which did not help.

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