;
-; Zeropage and I/O definitions for the CBM 610
+; Zero page variables and I/O definitions for the CBM 610
;
; Taken from a kernal disassembly done by myself in 1987.
;
-; Ullrich von Bassewitz, 28.09.1998
+; 1998-09-28, Ullrich von Bassewitz
+; 2014-04-02, Greg King
; ---------------------------------------------------------------------------
; Zeropage stuff
-ExecReg := $00
-IndReg := $01
+ExecReg := $00 ; Controls execution memory bank
+IndReg := $01 ; Controls indirect indexed load-store bank
TXTPTR := $85 ; Far pointer into BASIC source code
+FNAM := $90 ; Far pointer to LOAD/SAVE file-name
+FNAM_LEN := $9D ; Holds length of file-name
; ---------------------------------------------------------------------------
; Screen size