TMS9902
 TMS9902
 TMS9902
  TMS9902 CRU  CPU TMS9902  I/O     1 2 3  !"#$%&'( ) *!"+,- TMS9902 .
&/012 3$4567 8#$9:;= ?@ 45ABCDEFGHI:; JKLMNO 45AB TMS9902 3$PQRSTRUS #$V%W%&XY/0Z )[ TMS9902 \] NMOS ^_S` 18 abcdefg \]+5V hi j& )k
TTL lm TMS9902 
 INTB TxD RxD CRUIN RTSB CTSB DSRB CRUOUT VSS(GND) ---- ---- -- -- --1 18 2 17 3 16 4 15 5 TMS9902 14 6 13 7 12 8 11 9 10 ----------VCC (+5V) CEB CLKB CRUCLK S0 (MSB) S1 S2 S3 S4 (LSB)
 ab CRUIN CRUOUT CRUCLK CEB S0~S4 CLKB DSRB abno t CPU uv= - CPU {uv| CRU uv} w CRU ~N '( uvXYƒ„…† pq = | | | | | | rs w]xy* TMS9901 zj w]xy* TMS9901 ...

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