There's only one very small difference between AT-88 V1.2 and V1.30: the formatted data for double-density sectors was changed from $9249 to $0000. Strangely, single density wasn't also fixed. This issue wasn't fixed in the other product lines until RFD 2.10.   AT88 and AT88SPD firmwares don't match up; there are significant hardware differences and the printer code was also inserted near the beginning of the firmware, so they'll never appear similar in any significant way unless you c
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