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Length: 637 (0x27d) Types: TextFile Notes: R1k Text-file segment
└─⟦8527c1e9b⟧ Bits:30000544 8mm tape, Rational 1000, Arrival backup of disks in PAM's R1000 └─ ⟦cfc2e13cd⟧ »Space Info Vol 2« └─⟦b6d1bcc00⟧ └─⟦this⟧
; ;PPI memory mapped to CPU ; OPTIONS CONVERT ROM EQU 2000H STACK EQU 4500H PPI EQU 3018H PortA EQU PPI PortB EQU PPI+1 PortC EQU PPI+2 Ctrl EQU PPI+3 Mode EQU 10011000B Inta EQU 0DH Fin EQU 10H ORG ROM LD SP,Stack LD A,Mode LD (Ctrl),A ;set up PPI LD A,1 LD (PortC),A ;set Pc0 LD A,0 LD (PortC),A ;reset Pc0 read: LD A,(PortC) RLA ;test if Pc7 set JP C,read LD A,(PortA) END