RAINBOW TOS 1.4 (1.04) US Atari Mega ST & 520/1040ST 2 Chip Mask ROM ICs.

Description

Rainbow TOS 1.4(1.04) US for the Atari Mega ST & 520/1040ST 2 Chip Mask ROM ICs.
Easy plug in replacement of older TOS 1.0 and TOS 1.2 2 chip TOS.
Note the label on the package and the Instructions are all from Atari and they call it TOS 1.4
TOS 1.04 was an inventory number and was never on any of the chips or instructions from Atari.
These are genuine parts from Atari with the original Atari labels.
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