HP HP-67 - Page 304

300 Interchangeable Software
HP-67 Programmable Pocket Calculator
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On the HP-67, keycodes for functions that are selected by first press-
ing a prefix key and then a digit key are referenced by the keycode
matrix address, not by 00 through 09. On the HP-97, however, the
prefixed functions that are below the digit keys are referenced by
keycodes of 00 through 09. On the HP-97, the keycodes for the keys
on the right-hand keyboard (except for the digit keys) are generated
with minus signs before them. For example, if you had loaded the
operation EE@ 9 into the HP-67, the keycode would be 23 09 (that is,
2" row, 3 key, followed by the keycode 09 for the 8] key). If you
recorded that operation on a magnetic card, then read the card to load
the same operation into an HP-97, the keycode for the operation on the
HP-97 would be -63 09 (that is, 6'™ row, 3™ key of the right-hand
keyboard, followed by the (9] key).