MEGA65 glue code for DOS finished

src/dos_m65/,aliases_dos.s

@@ -0,0 +1,11 @@
+//
+// Memory locations for the DOS
+//
+
+	//
+	// Page 0
+	//
+
+	.label UNIT_SDCARD  = $00
+	.label UNIT_FLOPPY  = $01
+	.label UNIT_RAMDISK = $02

src/dos_m65/4000.dos_vectable.s

@@ -3,6 +3,7 @@
 
 .word dos_INIT
 .word dos_CHKUNIT
+.word dos_SETUNIT
 .word dos_ACPTR
 .word dos_CIOUT
 .word dos_LISTEN

src/dos_m65/dos_chkunit.s

@@ -0,0 +1,38 @@
+
+//
+// Unit number handling. For detailed description see 'm65dos_bridge.s' file
+//
+
+
+dos_CHKUNIT:
+
+	cmp UNIT_SDCARD
+	beq dos_CHKUNIT_sdcard
+	cmp UNIT_FLOPPY
+	beq dos_CHKUNIT_floppy
+	cmp UNIT_RAMDISK
+	beq dos_CHKUNIT_ramdisk
+
+	sec
+	rts
+
+dos_CHKUNIT_sdcard:
+
+	lda #$00
+	skip_2_bytes_trash_nvz
+
+	// FALLTROUGH
+
+dos_CHKUNIT_floppy:
+
+	lda #$01
+	skip_2_bytes_trash_nvz
+
+	// FALLTROUGH
+
+dos_CHKUNIT_ramdisk:
+
+	lda #$02
+	
+	clc
+	rts

src/dos_m65/dos_init.s

@@ -0,0 +1,17 @@
+
+//
+// Initializes DOS. For detailed description see 'm65dos_bridge.s' file
+//
+
+dos_INIT:
+
+	lda #CONFIG_UNIT_SDCARD
+	sta UNIT_SDCARD
+	lda #CONFIG_UNIT_FLOPPY
+	sta UNIT_FLOPPY
+	lda #CONFIG_UNIT_RAMDISK
+	sta UNIT_RAMDISK
+
+	// XXX initialize drivers, etc.
+
+	rts

src/dos_m65/dos_setunit.s

@@ -0,0 +1,42 @@
+
+//
+// Unit number handling. For detailed description see 'm65dos_bridge.s' file
+//
+
+
+dos_SETUNIT:
+
+	// XXX check if .X is valid
+
+	cmp #$00
+	beq dos_SETUNIT_sdcard
+	cmp #$01
+	beq dos_SETUNIT_floppy
+	cmp #$02
+	beq dos_SETUNIT_ramdisk
+
+	sec
+	rts
+
+dos_SETUNIT_sdcard:
+
+	stx UNIT_SDCARD
+	skip_2_bytes_trash_nvz
+
+	// FALLTROUGH
+
+dos_SETUNIT_floppy:
+
+	stx UNIT_FLOPPY
+	skip_2_bytes_trash_nvz
+
+	// FALLTROUGH
+
+dos_SETUNIT_ramdisk:
+
+	stx UNIT_RAMDISK
+
+	// FALLTROUGH
+
+	clc
+	rts

src/dos_m65/stubs.s

@@ -1,10 +1,6 @@
 
 // Dummy implementations - XXX to be replaced with real ones
 
-dos_INIT:
-	nop
-dos_CHKUNIT:
-	nop
 dos_ACPTR:
 	nop
 dos_CIOUT: