Re: ESB ROM questions

>Frank Palazzolo wrote:
>>
>> I'm having a difficult time figuring out what's up with
>> the ROM images in the ESB set.
>>
>> First of all, on both Jess Askey and Brian Peek's site,
>> there is an 8K ROM labelled 136021.103. While in Clay's
>> SW/ESB set, half of the ESB ROM that goes in that same socket
>> is 16K, and the image is labelled 136031.203 in SW_ESB.txt.
>>
>
>The ROM's on my site have not been verified by me ever, I don't know if
>they are good
>or not. I have always meant to split up all of Clay's images into a
>proven good set to
>put on my page but I haven't had the time and no one else has mentioned
>that they were
>bad. Also, Brian Peek's ROM's came from my page so that is why they are
>the same.

There are quite a few "bad" ESB ROM sets floating around out there. The
set on my page is known good. There is a "gotcha" as you noted below. My
daughtercard has the U2 and U3 designators reversed compared to an
"original" ESB daughtercard. 'Feh. I don't remember if that was an "oops"
or an "intentional". I think it was intentional 'cause it made for
sequential numbering across the board that I liked... Of course it's all
hodge-podge now 'cause I added the circuitry for the NOVRAMs and whatnot.

>> It appears that 8K of ESB data is missing from Jess and Brian's set.
>> And, what was the original Atari ROM name?
>>
>> Also, in Clay's double-backed roms for the daughterboard, U3 & U2,
>> the images for 136031.105 & 136031.106 are backwards from the labels
>> in Jess' and Brian's set. Are the Jess/Brian numbers right on this
>> one?
>>
>
>Im sure that Clay's are more reliable than mine.... Clay??

Yeah, the "8K missing" was the problem I originally had getting ESB going.
Someone finally got me good data, but the "bad" ones are pretty well
propagated by now. You can make a good set from the data on my webpage by
splitting all the ROMs into 16K chunks (4K for the AVG EPROM). The upper
half will be ESB. 8K Star Wars EPROMs (like the U2/U3 ones) will be
duplicated in the 16K bank. Remember to reverse U2 and U3. (ESB_U2 and
ESB_U3 on the daughtercard.)

I was going to hook up the logic analyzer to the PLD on the daughtercard
and run some test for Neil Bradley since he's still working on ESB for EMU,
but haven't got around to it yet. Neil was still stuck last I talked to
him. (Hmmm, he still has to come pick up his Xevious too... ;-)

-Clay

Clayton N. Cowgill Engineering Manager
_______________________________________________________________________
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Received on Fri Dec 12 08:49:53 1997