c302020-020B ...which TOS ?

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LevelFT
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c302020-020B ...which TOS ?

Postby LevelFT » Tue Jan 02, 2018 6:09 am

I recently got a wonderful Mega STE and I noticed it has this version of TOS ROMs:

c302020-020B
c302021-020B

IMG_3831.PNG


Now ive read that c302020-020 is TOS 2.05 .....but what does the B stand for ?

Also....my memory tells me that when I upgraded my 1040 to TOS 2.06 many,many years ago, I started to see the Atari logo and RAM test at boot up, but this version doesn't show this ? Is this something that was added when they went from 2.05 to 2.06 ?

It's a UK machine by the way, I've heard from a former Atari Benelux employee that this was the Verizon that was officially sold in The Netherlands, maybe this has to do something with the B ?

I can't find the B version listed in the FAQ.

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Re: c302020-020B ...which TOS ?

Postby Maeke » Tue Jan 02, 2018 10:58 am

if you don't have the logo at boot nor the ram test then it's 2.05. And considering 2.06 is mainly a bugfix of 2.05, i'd advise you to do the upgrade.

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Re: c302020-020B ...which TOS ?

Postby frank.lukas » Tue Jan 02, 2018 11:58 am

C302020-002 = TOS 2.05 ROM (2Chip) EE-Chip United Kingdom
C302021-002 = TOS 2.05 ROM (2Chip) OE-Chip United Kingdom
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LevelFT
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Re: c302020-020B ...which TOS ?

Postby LevelFT » Tue Jan 02, 2018 5:23 pm

frank.lukas wrote:C302020-002 = TOS 2.05 ROM (2Chip) EE-Chip United Kingdom
C302021-002 = TOS 2.05 ROM (2Chip) OE-Chip United Kingdom



Yeah I found that info, but I was curious about the B trailing that number....

I'll save the contents and compare with regular 2.05 TOS UK version.

And next I'll burn them to 2.06 which was already my plan anyway....

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Re: c302020-020B ...which TOS ?

Postby tzok » Tue Jan 02, 2018 6:36 pm

You won't burn anything on these... as they are mask ROMs.

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Re: c302020-020B ...which TOS ?

Postby Maeke » Tue Jan 02, 2018 8:15 pm

yep, those can't be modified, at all.

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Re: c302020-020B ...which TOS ?

Postby LevelFT » Wed Jan 03, 2018 11:24 pm

uh......

27c010 are EPROMs AFAIK.....

Also surprised me that no-one knows what the B stands for,.....I wonder if I ave something special here ?
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Re: c302020-020B ...which TOS ?

Postby Maeke » Thu Jan 04, 2018 10:15 am

LevelFT wrote:uh......

27c010 are EPROMs AFAIK.....

Also surprised me that no-one knows what the B stands for,.....I wonder if I ave something special here ?


Well couldn't see your previous pictures, so since you gave atari's part number, i assumed those were original roms.
Besides, the mega ste's service manual shows versions C of the tos 2.05, but no versions B. Might as well be a typo of the guy who printed those labels, or a beta.

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Re: c302020-020B ...which TOS ?

Postby czietz » Sat Jan 06, 2018 5:16 pm

Assuming that $8D31 and $0B76 are the checksums of the ROMs, you have a standard TOS 2.05 (UK version). Those two values match the checksums of the official TOS 2.05 UK release. If you still suspect that you have something special, then why don't you dump TOS into a file and compare it to a TOS ROM dump from the Internet? (For example, I found a pre-release version of TOS 1.04 in one of my 1040STs...)

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Re: c302020-020B ...which TOS ?

Postby LevelFT » Thu Jan 11, 2018 8:15 pm

Yep, Thats my plan :) ....now find some time and energy to dig up my EPROM stuff


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