Addr.  6502 Host  Z80 Tube   Z80 Sigma
&FF80             ESCFLG     ESCFLG
&FF81             TERMFLG
&FF82             FAULT      FAULT
&FF84             DEF_ERR    DEF_ERR

&FF9E             PR_OUT
&FFA1             INIT_FF
&FFA4             M_OSWD_7F
&FFA7             LD_CCP
&FFAA             PR_HEX     PR_HEX 
&FFAD             PR2HEX     PR2HEX
&FFB0             USERINT
&FFB3  OSWRSC     PR_TEXT    PR_TEXT
&FFB6  DEFVEC     PRNT_C
&FFB9  OSRDRM     CLI_COM    CLI_COM
&FFBC  RAWVDU     RST_38
&FFBF  OSEVEN     INIT_ERR
&FFC2  GSINIT     TRK_00
&FFC5  GSREAD     KBD_TST
&FFC8  NVWRCH     TERM
&FFCB  NVRDCH     OSWRD2     OSFSC
&FFCE  OSFIND     OSFIND     OSFIND
&FFD1  OSGBPB     OSGBPB     OSGBPB
&FFD4  OSBPUT     OSBPUT     OSBPUT
&FFD7  OSBGET     OSBGET     OSBGET
&FFDA  OSARGS     OSARGS     OSARGS
&FFDD  OSFILE     OSFILE     OSFILE
&FFE0  OSRDCH     OSRDCH     OSRDCH
&FFE3  OSASCI     OSASCI     OSASCI
&FFE7  OSNEWL     OSNEWL     OSNEWL
&FFEE  OSWRCH     OSWRCH     OSWRCH
&FFF1  OSWORD     OSWORD     OSWORD
&FFF4  OSBYTE     OSBYTE     OSBYTE
&FFF7  OSCLI      OSCLI      OSCLI
&FFFA  NMIV       BRKV
&FFFC  RSTV       EVENTV
&FFFE  INTV       INTV