This is great work, Rich. It is like looking at dinosaur bones and trying to figure what it was eating. Dwight
________________________________ From: cctalk <[email protected]> on behalf of Richard Cini via cctalk <[email protected]> Sent: Sunday, September 27, 2020 7:07 AM To: Discussion: On-Topic Posts Only <[email protected]> Subject: SCP/Microsoft 20HAL uploader All – I’ve done a quite a bit of work with my Seattle Gazelle, and I just did some work on 86DOS.SYS (not released in source form, as far as I know) and its comparison to PC DOS 1.0 (at the code level, a very high correlation as you can imagine). Partially related to that is a program called “20HAL” which was a code uploader Microsoft used in the late stages to get code from Microsoft in Bellevue to IBM in Boca Raton, FL. I did a little write-up on it here (http://www.classiccmp.org/cini/hal.htm) There are some holes in the analysis – I think it’s pretty close, though -- but I’d really like to get some more details on it. Unfortunately, it’s 40-year-old code at this point, and how many people remember how they used a file transfer utility that long ago? Anyway, enjoy the read. If anyone sees any corrections that need to be made, let me know. Thanks! Rich -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32
