14 Jan
2010
14 Jan
'10
5:18 p.m.
What have you
sell, that can be shipped and in *small packages*?
Let me know now, and I can plan to scrape up cash. What I allways
wanted was a Heath 11, or something that has a OS, 32KB of memory
a PDP 11 cpu and working media bigger than mini-floppy size.
I would suggest that you aim a bit higher at a BA23 box since they
are probably just as available as a PDP-11/03 as far as the backplane
is concerned. MegaByte memory should also be available, so the
minimum CPU would be a PDP-11/23. V05.00 of RT-11 supports
the use of the full 4 MegaBytes of the memory and is available. Since you are mostly a hardware person (if you want a
Heath 11),
what do you actually do with a computer after you have it running?
I ask that since I am a software person. There seems to be an endless
supply of software challenges once the hardware is working.
Well I would like to get a OS and assember/linker/editor as
basic software, but I have no idea cost or legal issues of said items.
PDP 8 software I find on the web, PDP 11 stuff I don't think so.
Also, which operating system? In RT-11, the DY.SYS
device driver
works very well. BUT the DYX.SYS device driver supports ONLY
an 18 bit address, so the user buffer MUST be below 1/4 MegaByte
in the extended memory for the DEC release. Since all of the DEC
utility programs avoid the use of extended memory, a user buffer above
1/4 MegaByte is a problem only if VBGEXE is being used with a DEC
utility program.
I am single user here,small is better.
Sincerely yours,
Jerome Fine
Thank you.