Category: runtime support

INT 90 - APL*PLUS/PC - USED BY PORT 10 PRINTER DRIVER

--------r-91
INT 91 - IBM ROM BASIC - used while in interpreter
Notes:	called by ROM BASIC, but pointed at IRET by BASIC.COM/BASICA.COM
	BASIC.COM/BASICA.COM do not restore vector on termination
SeeAlso: INT 90,INT 92