Maxc Byte Lisp

Notes about the Maxc Byte Lisp instructions, gleaned from microcode sources.

Additional PDP-10 instructions

It's not entirely clear, but it seems to me most of these are used in addition to the normal PDP-10 instruction set. These are defined in the microcode source file lisp.mc.

Opcode	Mnemonic	Description
107	BLISP
114	RETFR	Return from function
115	UPSHJ	Dispatching UUO call
116	LDT	Load type of pointer
117	BTLU	Bit table lookup
120	BFRET	Return to Byte Lisp function
121	CALLFN	Call Lisp function
247	CHASE
257	REWIND	Reverse shallow-deep bindings in a frame

Byte Lisp instructions

These instructions are 9 bits. They are defined in the microcode source files lispm1.mc and lispm2.mc, which are for Maxc1 and Maxc2, respectively.

Opcode	Mnemonic
601	SVARX
603	LVARX
605	XVARX
607	ARG
611	CONSTX
613	SDSETX
615	SSETX
617	LDSETX
621	LSETX
623	XDSETX
625	XSETX
627	JUMPXX
631	GETLIST
633	ASSOC
635	ITIMES2
637	IQUOT
641	IREMN
643	IOR2
645	IXOR2
647	BLSH
651	BASH
653	NTYP
702	MINONE
703	ZERO
704	ONE
705	TWO
706	SIC
707	NIL
710	T
711	COPY
712	POP
714	POP2
715	POP3
716	VAG
717	IPLUS2
720	IDIF
721	IAND2
722	ADD1
723	SUB1
725	DBIND
726	BIND
727	UNBIND
730	RETURN
731	XRETURN
732	JUMP IF 0(PP) = NIL
733	JUMP IF 0(PP) # NIL
734	JUMP IF 0(PP) # -1(PP)
735	JUMP IF 0(PP) = -1(PP)
736	JUMP IF 0(PP) IS NOT AN ATOM
737	JUMP IF 0(PP) IS AN ATOM
740	JUMP IF 0(PP) IS NOT A LIST
741	JUMP IF 0(PP) IS A LIST
742	JNNUM
743	JNUM (TYPE .E. FLOATT TO SMALLT)
744	JNFIXP
745	JFIXP (TYPE .E. FIXT TO SMALLT)
746	JUMP IF 0(PP) IS NOT OF TYPE = NEXTBYTE
747	JUMP IF 0(PP) IS OF TYPE = NEXTBYTE
750	JUMP IF -1(PP) .NE. 0(PP)
751	JUMP IF -1(PP) .E. 0(PP)
752	JUMP IF -1(PP) .GE. 0(PP)
753	JUMP IF -1(PP) .L. 0(PP)
754	JUMP IF -1(PP) .G. 0(PP)
755	JUMP IF -1(PP) .LE. 0(PP)
756	JUMPX
757	SWAP
760	LAST
761	FETCHFIELD
762	REPLACEFIELD
763	FRPLACD
764	FRPLACA
765	RPLACD
766	RPLACA
767	GETP
770	CDDR
771	CDAR
772	CADR
773	CAAR
774	CDR
775	CAR
776	FMEMB