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Flags ER: Mi, M+1,Su, and Su+1 are not BCD.
Indirectly addressed DM word is non-existent. (Content of DM word is
not BCD, or the DM area boundary has been exceeded.)
CY: ON when the result is negative, i.e., when Mi is less than Su.
EQ: ON when the result is 0.
The following example works much like that for single-word subtraction. In this
example, however, BSET(71) is required to clear the content of DM 0000 and
DM 0001 so that a negative result can be subtracted from 0 (inputting an 8-digit
constant is not possible).
Example
CLC(41)
@SUBL(55)
HR 20
120
DM 0100
CLC(41)
@SUBL(55)
DM 0000
DM 0100
DM 0100
TR 0
25504
HR 2100
00003
25504
HR 2100
First
subtraction
Second
subtraction
Turned ON to indicate
negative result.
@BSET(71)
#0000
DM 0000
DM 0001
00000 LD 00003
00001 OUT TR 0
00002 CLC(41)
00003 @SUBL(55)
HR 20
120
DM 0100
00004 AND 25504
00005 @BSET(71)
# 0000
DM 0000
DM 0001
00006 CLC(41)
00007 @SUBL(55)
DM 0000
DM 0100
DM 0100
00008 LD TR 0
00009 AND 25504
00010 OR HR 2100
00011 OUT HR 2100
Address Instruction Operands Address Instruction Operands
BCD Calculations Section 5-19