3202
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3202 is the ND-120/CX CPU board. The same identifier (variants 350175/350176/350177/350178) is used for ND-125/CX CPU boards. The difference is that the 125/CX has faster on-board memory access and includes more on-board memory (8/12/16 MB, the 120/CX can have up to 6MB RAM on-board).[1]
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Introduction
It contains the CPU, bus arbitration logic, memory control, memory and other subsystems. It also has the Real time clock and the I/O for the serial console.
Switches and indicators
- SW3 - Master Clear - normal position = central. This switch may be depressed to give a hardware master clear to the CPU.
- TH1 - ALD select
- TH2 - Baud rate select
- LED3 - self test passed (green)
- LED2 - self test fail (red)
- LED1 - cache OFF (red)
- SW1 - Cache ON, normal position = down.
- LED6 - CPU grant (green)
- LED7 - bus grant (yellow)
- SW2 - Memory OFF, normal position = down.
- LED4 - parity error (red)
- LED5 - parity disable (red)
- SW4 - Parity disable, normal position = down.
- upper limit display
- 000 - memory off (SW2)
- 100 - 2M Bytes onboard memory
- 200 - 4M Bytes onboard memory
- 300 - 6M Bytes onboard memory
Connectors
The A and B connectors are used for I/O, the C connector is used for the ND-100 Bus.
I/O Devices on the card
none?
ECO
ECO or Engineering Change Order is a hardware change. Here is a list of known ECO's for this card.
- ECO 100-751 - Gives false interrupt, IOX error, MOR or Protect violation[2]
- ECO 100-752 - Sintran corruption when heavy load on the bus[2]
- ECO 100-774 - Memory out of range[2]
- ECO 100-779 - System failing with cache enabled[2]
- ECO 100-785 - Memory out of range, IOX-error[2]
- ECO 100-786 - Upgrade ND-120CX CPU & MM 32B 2MB to ND-125CX[2]
- ECO X01 - New backup battery for the calendar on ND-120 CPU[2]
Reference
- Norsk Data Document ND–30.008.3 EN ND-100 Hardware Maintenance , page 255