Try this: http://www.brutman.com/mTCP/download/ftp_2026-08-20.exe

Also, use MTU 492. You can try 504 but 492 should be safe.

mbbrutman wrote on Yesterday, 18:38:

Try this: http://www.brutman.com/mTCP/download/ftp_2026-08-20.exe

All uploads in BINARY mode from HDD, in KB/s:

MTU 492:

ARCPSF, ftp.exe: 73..82
ARCPSF, ftp_2026-08-20.exe: 66..72
SMCARCWS, ftp.exe: 77..83
SMCARCWS, ftp_2026-08-20.exe: 40..77

It probably doesn't make sense to struggle with this any further...
To compete with Windows, we would need a new PD - but I'm not able to write one, and can't see anybody else using Arcnet.
Also, circa 80 KB/s isn't that bad for XT-era technology, and already much faster than CUTCP and WatTCP.