             ;******* Pep/8 Operating System
             ; 
             TRUE:    .EQUATE 1          
             FALSE:   .EQUATE 0          
             ; 
             ;******* Operating system RAM 
FBCF         osRAM:   .BLOCK  128        ;System stack area 
FC4F         wordBuff:.BLOCK  1          ;Input/output buffer 
FC50         byteBuff:.BLOCK  1          ;Least significant byte of wordBuff 
FC51         wordTemp:.BLOCK  1          ;Temporary word storage 
FC52         byteTemp:.BLOCK  1          ;Least significant byte of tempWord 
FC53         addrMask:.BLOCK  2          ;Addressing mode mask 
FC55         opAddr:  .BLOCK  2          ;Trap instruction operand address 
             ; 
             ;******* Operating system ROM 
FC57                  .BURN   0xFFFF     
