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(2) Explanation of Front Panel
LED
No. Normal Name Color Meaning
1 Lit RUN Green CPU is running. (in any other state than HALT)
2 Dimly lit DMA Green I/O assumes bus right according to DMA transfer procedure.
(BBSY on VEM is in assert state.)
3 INT Green Request for interrupt is made to MPU.
4
Acces → Lit
MBSY Green Memory bus is busy. (Main memory is accessed.)
5 Lit FAIL Red CPU double bus halt or WDT time up
6 Extinguished DIAG Red Flickering : Self-diagnosis error
Lit : Boot error, self-diagnosis under execution
7 Extinguished MERR Red Parity error (SRAM or main memory on CPU board)
Miscellaneous
No. Name Meaning
1 RESET Resetting of CPU board and system
2 ABORT NMI to MPU
3 RSCN Debugging monitor port
4 MBSICN 4-channel serial communication port
5 AUICN Insert AUI connector
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