JAN: Difference between revisions
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|Format=JAN <[[displacement|disp.]]>'' | |Format=JAN <[[displacement|disp.]]>'' | ||
|Code=130 400 | |Code=130 400 | ||
|Affected=If A<0 | |Affected=If A<0 P:=P+Δ | ||
|Architecture=[[ND-100]], [[ND-110 CPU|ND-110]] | |Architecture=[[ND-100]], [[ND-110 CPU|ND-110]] | ||
}} | }} | ||
Latest revision as of 08:41, 21 March 2013
| JAN | |
|---|---|
| Description | Jump if A negative |
| Format | JAN <disp.> |
| Code | 130 4008 |
| Affected | If A<0 P:=P+Δ |
| Type | User |
| Architecture | ND-100, ND-110 |
JAN is an assembly instruction. If the A register is negative (bit 15 = 1) it jumps the program execution to the address of the program counter (P register) plus the value of displacement, which can be in the range -128 .. 127. Else it continues the program execution at (P) + 1.
References
- Norsk Data Document ND–06.014.02 ND-100 REFERENCE MANUAL Page 139
- Norsk Data Document ND–06.029.01 ND-110 Instruction Set Page 79