HP HP-67 - Page 243

Using the 1-Register for Indirect Control 239
0 511
r—— GO @
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I
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Naturally, you can also press from the keyboard to begin
execution from the specified (0.
Subroutines can also be addressed and utilized with the I-register.
When ([} is executed in a running program (or pressed from the
keyboard), execution transfers to the specified and executes the
subroutine. When a[RTN| is then encountered, execution transfers back
to the next instruction after the (@ and resumes. For example,
with the number 7 stored in the I-register, [@) causes execution of
the subroutine defined by 7 and (RTN].
l v mE0E
//
0 s //
acsEm |7
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The simple-to-remember addressing using the I-register is the same
for and {@. If the I-register contains zero or a positive
number from 1 through 9, ([ addresses 0 through 9.
When the number in I is a positive 10 through 14, ¥ through