150 (NORD-1 card)
150 Register, is a card that is used as the instruction register in the NORD-1 CPU. It holds the current instruction during execution.
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The card is made in the standard NORD-1 card format.
|CPU model||Crate position|
The logic diagram is documented in drawing 2A50.
The content of the IR is set by the MJ-bus and strobed by the IS1-0 signal on pin 29 and 30. The IS2-0 strobe forces the IR to 161402 (IOT SKA #2) or 161422 (IOT SKA #22) depending on the state of LEN-1, this is a load sequence initiated from the operators panel.
IS2-0 strobe comes from the 122 Assembler card, where the IS1-0 signal comes from isn't known yet.
Switches and indicators
There are no switches or indicators on this board.
This list contains the logic circuits used, passive components are not listed.
- 4 x 7400
- 4 x 7440
- 8 x 7474
- HARDWARE MANUAL NORD 1
- Hardware in NORD-1 Serial 47