Newest serial.sys source code with Windows NT?

NTDEV
1

We want to make a simple change to the Windows NT (non-WDM) serial.sys that
can’t be done in a filter driver, namely toallow for memory-mapped COM ports
instead of only usuing I/O ports. We have the serial.sys source code in the
DDK, but serial.sys was patched in one of the service packs, so that’s
probably not the newest.

We asked Microsoft support and they said that we can’t get it. However, I
would think that it should be out there somewhere since it’s a sample, not
something Microsoft really keeps secret.

Does anyone have any suggestions?

2

The XP DDK provides a “serial” with some extensions to the orginal NT40
DDK version :

  • Pc98
  • FIFO depth > 16
  • corrections…

May be you should make a step by step LOGICAL compare of both versions
while skipping the PnP, WMI, … code of the XP version.