OK second attempt at a long post - just closed the TAB arghhh
It has been suggest that an update may be a good idea here - and I have an ulterior purpose. I have just pushed out my usual Monthly video which actually uses the H8 and H17 disk to play the earliest available version of ADVENT on a home computer...
https://youtu.be/P7XvHifN78k
To get there I have had a variety of events from fixing blown bullet tantalums on a very old 5.25 drive PCB to having to use a HP Logic Analyser to find out what is wrong with the IRQ system when booting from disk. At the moment I have a switch that allows it to be disabled to get to stage 1 and press a key then back on to continue. Glenn in the user group kindly built an identical config system and proved it did not do it for him - which means I need to look again.
That of course is after I had to spend some hurtful sums on unusual RAM chips to repair those boards.
The other reason for the update is I am about to start looking at the H9 video terminal and although I have the original Assembly and Operation manuals I do not have the traditional Heathkit separate schematics booklet... The two I have are online here if you are interested in this fascinating machine which is pretty much all TTL no CPU like the ADM-3A and most earlier GlassTTY. Who knows what questions I may have if I have to puzzle out its operation - the PET thread may dwarf in comparison.
https://sebhc.github.io/sebhc/docume...l#Heathkit_H-9
For those coming to the thread later and/or want to watch the videos mentioned I add new videos on this system restore to my playlist.
https://www.youtube.com/playlist?lis...ig9vm2YgCgz99x