There are at least 4 different ROM sets for Joust (most likely more
since there is a gap in the production numbering for another set). The
"A" or "B" is the suffix to the ROM number printed on the sticker
labels. The ROM at position F4, for example, should either say "ROM 1A"
or "ROM 1B" somewhere on it. You can tell by checking the checksums
that a lot of the ROMs are identical but each set has (at least) several
ROMs which are unique.
Code:
[FONT=Courier New]|<---------------Information from sticker--------------->| |[/FONT]
[FONT=Courier New] | White/Red |Solid Green | Solid Red | Wht/Grn |[/FONT]
[FONT=Courier New]ROM| Brd | "A" 2532 | "B" 2732 | "A" 2532 | "B" 2732|[/FONT]
[FONT=Courier New]# | Loc | joust.wr# | joust.sg# | joust.sr# |joust.wg#|[/FONT]
[FONT=Courier New]---+-----+-------------+------------+------------+---------+[/FONT]
[FONT=Courier New]01 | F4 | 16-30060-1 | 16-3006-13 | 16-3006-28 | 3006-52 |[/FONT]
[FONT=Courier New]02 | C4 | 16-30060-2 | 16-3006-14 | 16-3006-29 | 3006-53 |[/FONT]
[FONT=Courier New]03 | A4 | 16-30060-3 | 16-3006-15 | 16-3006-30 | 3006-54 |[/FONT]
[FONT=Courier New]04 | F5 | 16-30060-4 | 16-3006-16 | 16-3006-31 | 3006-55 |[/FONT]
[FONT=Courier New]05 | C5 | 16-30060-5 | 16-3006-17 | 16-3006-32 | 3006-56 |[/FONT]
[FONT=Courier New]06 | A5 | 16-30060-6 | 16-3006-18 | 16-3006-33 | 3006-57 |[/FONT]
[FONT=Courier New]07 | F6 | 16-30060-7 | 16-3006-19 | 16-3006-34 | 3006-58 |[/FONT]
[FONT=Courier New]08 | C6 | 16-30060-8 | 16-3006-20 | 16-3006-35 | 3006-59 |[/FONT]
[FONT=Courier New]09 | A6 | 16-30060-9 | 16-3006-21 | 16-3006-36 | 3006-60 |[/FONT]
[FONT=Courier New]10 | A7 | 16-30060-10 | 16-3006-22 | 16-3006-37 | 3006-61 |[/FONT]
[FONT=Courier New]11 | C7 | 16-30060-11 | 16-3006-23 | 16-3006-38 | 3006-62 |[/FONT]
[FONT=Courier New]12 | F7 | 16-30060-12 | 16-3006-24 | 16-3006-39 | 3006-63 |[/FONT]