more work on CP/M memory banking

src/zvm_m65/z80_table_gen.s

@@ -12,36 +12,61 @@ z80_table_gen:
 	;
 	; Generating:   z80_atable_mi_bank0, z80_atable_hi_bank0
 	; Dependencies: NONE
+	; Destroys:     NONE
 	;
 
 	ldx #$00
 	
 @loop_atable_bank0:
 	
-	cpx #$E0
-	bcs @common_addr
+	cpx #$C0
+	bcs @addr_common
 	
-	; Memory area $0000-$DFFF - maps to $02000-$0FFFF - 56KB
+	; Memory area $0000-$BFFF - maps somewhere to $0xxxx range - 48KB total
 
-	lda #$04
+	lda #$00
 	sta z80_atable_hi_bank0, x
+
 	txa
+	cmp #$60
+	bcc @addr_lo
+
+@addr_hi:
+
+	; Memory area $6000-$BFFF - maps to $0C000 - $0FFFF - 24 KB
+
 	clc
+	adc #$40
+
+@addr_lo:
+
+	; Memory area $0000-$5FFF - maps to $02000 - $07FFF - 24 KB
+
 	adc #$20
 	sta z80_atable_mi_bank0, x
 
-@common_addr:
+	bra @loop_atable_next
+
+@addr_common:
 	
-	; Memory area $E000-$FFFF - maps to $4E000-$4FFFF - 8KB
+	; Memory area $C000-$FFFF - maps to $5C000-$5FFFF - 16KB
 	
-	lda #$04
+	lda #$05
 	sta z80_atable_hi_bank0, x
 	txa
 	sta z80_atable_mi_bank0, x	
 	
+@loop_atable_next:
+
 	inx
 	bne @loop_atable_bank0
 
+	;
+	; Generating:   XXX
+	; Dependencies: NONE
+	; Destroys:     NONE
+	;
+
 	; XXX add more tables here
 
 	;