28 Apr
2020
28 Apr
'20
2:56 p.m.
For those of you who have used Dunfield's PTR program and the OP-80A, what
PC did you use? I am attempting with a Compaq 486. I apparently have to
add resistors to some of the lines to control voltage from the normally
outbound parallel port.
I may switch to the SOL-20 and use that computer's parallel port instead.
I just want raw tape values, I can convert or do whatever with it, but
accuracy is the key for me.
Thanks everyone for your suggestions. I also brought home an Arduino from
the shop to see if I can get that to work.
Bill
On Tue, Apr 28, 2020 at 5:34 PM David Collins via cctech <
cctech at classiccmp.org> wrote:
Further to Dave?s post below, I?m happy to share the
Arduino code and
schematic if anyone has a suitable reader and wants to try it. It was
indeed designed to interface to the HP2748 but is pretty simple and could
be adapted to any similar reader.
David Collins
Sent from my iPad
On 29 Apr 2020, at 6:33 am, J. David Bryan via
cctech <
cctech at classiccmp.org> wrote:
?On Tuesday, April 28, 2020 at 17:56, Tony Duell via cctech wrote:
2748
The HP2748 is a common-ish example of this type
of un[i]t.
David Collins of the HP Computer Museum and I just recently completed
reading some 200+ paper tapes from the museum collection. He used a coupled with a custom Arduino-based interface to
produce plain-text
files
containing an octal representation of the tape
bytes. We passed these
through a small program to convert them to binary files and a second
program to verify checksums of those tapes containing relocatable or
absolute binary object data. The resulting files can be used as is with
the HP 2100 SIMH simulator or could be punched back into physical paper
tapes if desired.
-- Dave