Wow, Thanks ! Always wanted to try network over scsi but lacking the adapter, got to looking at rascsi but only driver for X68k computer afaiR.

Awesome! Thanks!

What kind of performance have you gotten?

With mTCP it's reasonable. (Use the "-i" option to tell the packet driver to hook the DOS Idle interrupt.)

Test: 8MB data transfer using TCP/IP, no file I/O:

• Pentium 133 & Adaptec 2940: Send at 1120KB/sec, Receive at 970KB/sec
• 486-66 & TMC-845: Send at 208KB/sec, Receive at 182KB/sec

That's a big difference, but the TMC-845 is a low end card - 8 bit ISA bus and a 5MB/sec SCSI bus speed. Moving up to an Adaptec 1542 would make that much faster.

WATTCP programs can be altered to run faster, but are slower by default. I didn't cheat to make mTCP faster; mTCP has always called the DOS Idle interrupt (0x28) and the MS-DOS multiplex interrupt for "Release Timeslice" interrupt to play nice with power saving TSRs and virtual machines. Because of the nature of SCSI this packet driver has to poll the hardware, and it does that under the BIOS hardware timer interrupt. But as an option ("-i", mentioned above) it can also hook the DOS Idle interrupt and poll under that too which works out great - mTCP signals it is idle and the TSR takes that opportunity to poll the hardware. Other networking code should have been doing that all along, but most of them are not actively maintained.)

mTCP Netdrive has the same problem - it's in DOS because it is a device driver, so it can't call the DOS Idle handler. I'll figure out some way to speed it up.

That's pretty impressive speeds, much higher than what you get on Mac!

Thanks, but also not really a fair comparison. Macs have real operating systems. : )