0679B | 
 SAVPTR
 | 
D0 to RPLTOP 
D1 to DSKTOP 
B to RETTOP 
D to FREETOP 
Clear carry
 | 
067D2 | 
 GETPTR
 | 
<see>SAVPTR in reverse 
Clears Carry.
 | 
05143 | 
 GETPTRLOOP
 | 
<see>GETPTR , Loop to RPL
 | 
6384E | 
 D0=DSKTOP
 | 
Get new D0 from DSKTOP, uses A
 | 
6385D | 
 D1=DSKTOP
 | 
Get new D1 from DSKTOP, uses C
 | 
010E5 | 
 AllowIntr
 | 
Allow interrupts.
 | 
01115 | 
 DisableIntr
 | 
Disable interrupts.
 | 
0115A | 
 AINRTN
 | 
A=IN see also <see>CINRTN 
For hardware reasons (bug) 
A=IN must be at even addr
 | 
01160 | 
 CINRTN
 | 
C=IN see also <see>AINRTN 
For hardware reasons (bug) 
C=IN must be at even addr
 |