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Re: Xenix adb reverse engineering (informix brand/serial)

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rayarachelian:

--- Quote from: blusnowkitty on October 23, 2020, 05:24:03 pm ---So, Xenix itself is actually broken? I just thought something was wrong with my X/Profile when I tried to get it going on a 10MB image.

--- End quote ---

Yes, Xenix uses the I/O ROM to *assume* the size of the hard drive attached to it. If you have a 2/5 it should have ROM H/A8 rather than H/88 for example. If it sees I/O ROM version A8 it assumes the hard drive is 5MB, if it sees 88, it assumes it's 10MB.

You can install a 2nd (and 3rd) hard drive if you have the dual port parallel card and then it will have enough space. When I first had Xenix going back in the late 80s, I setup one drive for the /usr partition, etc. There's no such limit on hard drives attached over the expansion slots.

see: https://lisafaq.sunder.net/single.html#lisafaq-sw-xen_about

rayarachelian:
I've posted the deserialized informix along with a small C program to deserialize the originals here: https://lisalist2.com/index.php/topic,123.msg896.html#msg896

Lisa2:
Great job Ray!
Thanks.

Todd:
Incredible!

compu_85:

--- Quote from: rayarachelian on October 23, 2020, 06:35:23 pm ---
--- Quote from: blusnowkitty on October 23, 2020, 05:24:03 pm ---So, Xenix itself is actually broken? I just thought something was wrong with my X/Profile when I tried to get it going on a 10MB image.

--- End quote ---
...If it sees I/O ROM version A8 it assumes the hard drive is 5MB, if it sees 88, it assumes it's 10MB.

...There's no such limit on hard drives attached over the expansion slots.


--- End quote ---

When I tried hanging extra 10m disks off of my Xenix system, it would let me format them as 10m, but any data written past 5m would be lost  :o

-J

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