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Seems to have chip production dates between '86 and '87. They are likely leftover Denise and 8520 ceramic chips from the A1000 production bin. Agnus is 512K made May '87. Gary is the Toshiba-made variant before MOS started producing it. Sharp made the KS1.2 ROM. note the old style ferrite beads and the heavy resistor package along the rear
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