Commodore PET User Manual page 186

The following sets show more of the rollover inconsistency that occurs with
keys in the bottom row of the keyboard:
KeY1
Keys
Rollover Result Key Order
Column
#1 #2
#3
#4
Even
rn
[<t6
Keys #1. 4, 3
[t6 <
Keys #1, 3,4
#1 #2
Even
Il
SPACE
l i
t6«> Keys #1, 2, 2, 3
#1
]<
üdd
Keys #1, 3
J<t6<
Keys #1, 3, 2, 3
#1 #3
üdd < Key #1
These three-key roi lover problems are not unique to the alphabetic and
special character keys alone, The right-hand portion of the keyboard, containing
the cursor controls and numerical keys, is a continuation of the even/odd column
format as shown in Figure 5-1. Cursor control and numeric rollover respond like
the alphabetic and graphie rollover.
ln summary, to avoid extraneous characters and combinations, hit only one
key at a time on the small PET keyboard. Be especially careful when depressing
any of the bottom row keys. Three-key roi lover on the PET is a desirable option,
but as the examples show, should not be depended upon for completely accurate
keyboard entry when typing is very fast or erratic.
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