ctty   / tty
        leadr  / ppt
        sret   / mem
        sret   / rf0
        sret   / rk0
        sret   / tap0
        sret   / tap1
        sret   / tap2
        sret   / tap3
        sret   / tap4
        sret   / tap5
        sret   / tap6
        sret   / tap7
        ccvt   / tty0
        ccvt   / tty1
        ccvt   / tty2
        ccvt   / tty3
        ccvt   / tty4
        ccvt   / tty5
        ccvt   / tty6
        ccvt   / tty7
/       ejec / lpr

ctty: / close console tty
        mov    tty+[ntty*8]-8+6,r5 / point r5 to the console tty buffer
        decb   (r5) / dec number of processes using console tty
        br     sret / return via sret

cppt: / close paper tape
        clrb   pptiflg / set pptiflg to indicate file not open
1:
        mov    $240,*$ps /set process or priority to 5
        jsr    r0,getc; 2 / remove all ppt input entries from clist
                          / and assign to free list
               br sret
        br     1b

/ejec:
/       mov    $100,*$lps / set line printer interrupt enable bit
/       mov    $14,r1 / 'form feed' character in r1 (new page).
/       jsr    r0,lptoc / space the printer to a new page
/       br     sret / return to caller via 'sret'

leadr: / produce paper tape leader
        mov    $100,*$pps / set paper tape punch interrupt enable
        mov    $100.,-(sp) / 101. characters of 'nul' will be output as
                           / leader
1:
        clr    r1 / r1 contains a 'nul' character
        jsr    r0,pptoc / output the 'nul' character
        dec    (sp)
        bge    1b / last leader character output?  no, branch
        tst    (sp)+ / bump stack pointer
        br     sret / return to caller via 'sret'

sysmount: / mount file system; args special; name