Bet you didn't know...(PDP-11)
Jerome H. Fine
jhfinedp3k at compsys.to
Sun Sep 24 20:09:06 CDT 2006
>Johnny Billquist wrote:
> Well, you can maybe still buy Quckware PDP-11 boards, so there are
> still new PDP-11 systems shipped. http://www.quickware.com/
Jerome Fine replies:
Any idea how much these boards cost and what the speed
ratio is vs the PDP-11/93? I had heard that QED was getting
speeds of 6 times the PDP-11/93, but that was many years
Of course, a Pentium 4 running E11 can now achieve between
50 to 100 times a PDP-11/93. Plus each emulated disk drive
can be many GigiBytes with I/O speeds also of 50 to 100 times
any "real" DEC drives.
Currently I am still using a 750 MHz Pentium 3 with 80 GigiByte
ATA 100 hard disk drives. Under W98 SE and FAT32, a 2 GigiByte
file can be used under RT-11 (or RSX-11). I can read/write all
32 MegaBytes of an RT-11 partition in a few seconds. Since the
system has 768 MegBytes of RAM, the system caches the emulated
drive and after the first access, reads/writes are from memory.
So I can understand why Mentec now sells only emulators. In
addition, E11 even supports a BCI adapter for commercial users
which allows a real DEC Qbus to be used when non-standard
hardware is still needed.
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