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 < cct...@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 < > cct...@classiccmp.org> wrote: > > > > On Tuesday, April 28, 2020 at 17:56, Tony Duell via cctech wrote: > > > >> 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 > 2748 > > 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 > > >
