The package for A20 Line Always On processing (and more) in HIMEM.SYS

[SweetLow]

On 6/20/2026 at 1:04 AM, cov3rt said:

i always get the unable to control A20 line

It is normal for hardware with Always On A20 line, I assume it is obvious.

[cov3rt]

On 6/21/2026 at 11:50 AM, SweetLow said:

It is normal for hardware with Always On A20 line, I assume it is obvious.

ok but also XMS driver could not be loaded / command.com, etc. is that normal too?

btw, this isn't same topic but i was wondering if you know whether "patcher9x" package includes all fixes from rloew's patchmem, or does one need to install patchmem before patcher9x in certain situations. patcher9x notes does reference certain portions of adding patchmem, but im not sure if that means everything from it - https://github.com/JHRobotics/patcher9x

Edited 13 hours ago by cov3rt

[SweetLow]

10 hours ago, cov3rt said:

but also XMS driver could not be loaded

If you said about error in some software you had to describe exactly error in software, not behaviour of hardware.

If you have error in himem.sys then take patched version (one of the two "preferred", of course) and just replace %windir%\HIMEM.SYS (or anywhere you want).

>if you know whether "patcher9x" package includes all fixes from rloew's patchmem

not all fixes, but all essential

Edited 2 hours ago by SweetLow