Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

If you want to ask questions about how the machine works, peculiar details, the differences between models, here it is !
How to program the oric hardware (VIA, FDC, ...) is also welcome.
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Symoon
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Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Post by Symoon » Mon Mar 18, 2019 9:52 pm

ISS, I think you were interested in this 1st Atmos ROM version, here it is, tape-saved from one of my Atmos. The checksum fits with the one at http://oric.free.fr/ROMS/romident.txt, called "A65D6CED Basic 1.1 original première mouture, appelé aussi Basic 1.1a".

To me the two main (only?) differences are:
- it checks for parity error during the synchro sequence, which lead to problems with tape readers that did adjust the sound level at the beginning of playback
- it did stop the auto-start when "errors" were "found" (which ROM v1.1b didn't anymore!)
ROM_Atmos_v1.1a.zip
(12.62 KiB) Downloaded 53 times

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iss
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Re: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Post by iss » Tue Mar 19, 2019 8:56 am

Thanks for the effort, Symoon!
This confirms my expectations - the code related to CLOAD is exactly the same as in the Pravetz-8D ROM!
I want to "investigate" when the Pravetz was copied from Oric :).
You said this particular Oric is an Atmos, do you have more info about it like production date, serial number, etc.?

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Re: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Post by Chema » Tue Mar 19, 2019 11:22 am

I am quite sure my Atmos has that ROM too (based on the research done when working on the fast load of SkoolDaze with Fabrice and Symoon) and this ROM came from a 1-to-Atmos conversion kit.

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Re: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Post by Symoon » Tue Mar 19, 2019 12:52 pm

iss wrote:
Tue Mar 19, 2019 8:56 am
You said this particular Oric is an Atmos, do you have more info about it like production date, serial number, etc.?
I can't tell you these details since I'm far away from it now, but I should check in 15 days. Just hoping I won't forget :lol:

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Re: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Post by Symoon » Sat Mar 30, 2019 10:16 pm

Well, the Atmos I got the ROM 1.1a from, hasn't got its serial number anymore.
So ISS, I pictured the motherboard, hoping it might help.
IMG_1387.JPG

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Re: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Post by iss » Sat Mar 30, 2019 11:56 pm

Great picture. Thanks, Symoon!
I think I should have such PROM somewhere, need to dig out it...

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