Radio Shack 16B Quick Reference Guide

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BVC
Branch on Over1low Clear.
Tests the stale ofthe V (over1low) bit and causes a branch if il is
clear.
When used after an operation on twos complement binary
values, this instruction will branch if
Ihere was no overllow.
41
BOB
Branch to Subroutine.
The pr09ram counter is pushed onto the stack. The program
counterls then loaded with the sum of Ihe program counterand
the offset.
BVO
Branch on Overllow Sel.
Tests Ihe state of the V (overllow) bit and causes a branch if it is
sel.
When used aller an operation on twoscomplement binary
values, this instruction will branch if
Ihere was an overllow.
BRA
Branch Always.
Causes an unconditional bran<:h.
BHN
Branch Never.
Does not
cause a branch. This instruction is essentially a no
operation,
bul has a bit pattern logically related to Branch
Always.
BLT
Branch on Less Than Zero.
Causes a branch il either, but not both, of the N (negative) or V
(overflow) bits are sel.
When used alter a subtract or compare
operation on twos
complement binary values, this instruction will
branch if the register
was less than the memory operand.
BPL
Branch on Plus.
Tests the state of the N (negative) bit and causes a branch if it is
clear.
BNE
Branch not Equal.
Tests the state of the Z (zero) bit and causes a branch if it is clear.
When used aller a subtractorcompare operation on any binary
values,this instruction will branch iflhe register is, orwould ba,
not equalto the memory operand.
Branch on Minus.
Tests the state of the N (negative) bit and causes a branch if set.
BMI
BLS
Branch on Loweror Same.
Causes a branch if the previous operation caused either a carry
or a zero resull. When used after a subtract or compare
operation on unsigned binaryvalues, this instruction will branch
ifthe register was
lower than or the same as the memory
operand.
BHO
Branch if Higheror Same.
Tests thestate of the C (carry) bit and causes a branch if it is
c1ear. When used alter asubtractorcompareon unsi~ned binary
values, this instruction will branch if
the registerwas hlgherthan
or the same as the memory operand.
BGT
BHI
Branch if Higher.
Causes a branch if the previous operation
caused neither a carry
nor a zero result. When used after asubtract or compare
operation on unsigned binaryvalues, this instruction will branch
if the registerwas
higherthan the memory operand.
Branch on Greater.
Causes a branch if the N (negative) bit and V (overllow) bilara
either bath selor both clear and the Z (zero) bit is clear, When
used alter a subtract or compare operation on twos complement
values, this instruction will branch ilthe registerwas greaterthan
the memOlY operand.
BGE
Branch on Greater Than or Equal talera.
Causes a branch if the N (negalive) bit and the V (overflow) bit
are eitherbath setor both clear. When used affer a sublract or
compare operation on twas complement values, Ihis instruction
will branch
if the registerwas grea/er than araqual to the memory
operand.
BLO
Branch on Lower.
Tests the state of the C (carry) bit and causes a branch if it is set.
When used altera subtract or compare on unsigned binary
values, this instructionwill branch if the registerwas lower than
the memoryoperand.
BEQ
Branch if Equal.
Tests the slateal the Z(zero) bit and causes a branch if il is set.
When used alter asublracl orcompare operation, this instruction
will
branch if the compared values, signed or unsigned, were
exacllythe same.
40
BLE
Branch on Less Than or Equalto Zero.
Causes a branch if the exclusive OR of the N (negative) and V
(over1low) bits is 1
or if the Z (zero) bitis sel. When used alter a
subtract
or compare operation on twos complement values, this
instructionwill branch
il the registerwas less than or equal tothe
memoryoperand.
BIT
Bit Test.
Per10rms a logical
AN D of the contents of accumulator A or Band
the contents of a memory location and modifies the condition
codes accordingly. The contents of accumulator A or B and the
memory location are not affeeted.

Radio Shack 16B Specifications

General

Brand	Radio Shack
Model	16B
Category	Desktop
Language	English