rework for the initial CBDOS

2021-02-03 16:05:07 +01:00
1 parent 82729bb621
commit 92d1ad0177
@@ -20,3 +20,7 @@
 	!addr UNIT_SDCARD      = $05
 	!addr UNIT_FLOPPY      = $06
 	!addr UNIT_RAMDISK     = $07
+
+	; General DOS status
+
+	!addr UNIT_HANDLER     = $08
@@ -2,8 +2,9 @@
 ; A vector table to integrate DOS with the MEGA65 Kernal

 !word dos_INIT
-!word dos_CHKUNIT
-!word dos_SETUNIT
+!word dos_UNITCHK
+!word dos_UNITSET
+!word dos_UNITNUM
 !word dos_ACPTR
 !word dos_CIOUT
 !word dos_LISTEN
@@ -0,0 +1,156 @@
+
+;
+; DOS error codes and strings
+;
+
+
+; XXX get rid of unnecessary error messages
+
+
+dos_err_init_sdcard:
+
+	!pet "m65 dos sdcard", 0
+
+dos_err_init_floppy:
+
+	!pet "m65 dos floppy", 0
+
+dos_err_init_ramdisk:
+
+	!pet "m65 dos ram disk", 0
+
+
+; List compiled from various manuals (CBM 1571, CBM 1581, CMD FD4000, MSD Super Disk, IDE64)
+
+
+dos_err_00: ; not an error
+
+	!pet "ok", 0
+
+dos_err_01: ; not an error
+
+	!pet "files scratched", 0
+
+dos_err_02: ; not an error
+
+	!pet "partition selected", 0
+
+dos_err_20: ; header not found
+dos_err_21: ; no data addres mark
+dos_err_22: ; block not found
+dos_err_23: ; data error
+dos_err_27: ; header error
+
+	!pet "read error", 0
+
+dos_err_25:
+
+	!pet "write error", 0
+
+dos_err_26:
+
+	!pet "write protect on", 0
+
+dos_err_29:
+
+	!pet "disk changed", 0
+
+dos_err_30: ; invalid characters in command
+dos_err_31: ; unrecognized command
+dos_err_32: ; command too long
+dos_err_33: ; illegal file name
+dos_err_34: ; missing file name
+
+	!pet "syntax error", 0
+
+dos_err_39:
+
+	!pet "file not found", 0
+
+dos_err_49: ; disk formatted, but format not supported
+
+	!pet "invalid format", 0
+
+dos_err_50:
+
+	!pet "record not present", 0
+
+dos_err_51:
+
+	!pet "overflow in record", 0
+
+dos_err_52:
+
+	!pet "file too large", 0
+
+dos_err_60:
+
+	!pet "write file open", 0
+
+dos_err_61:
+
+	!pet "file not open", 0
+
+dos_err_62:
+
+	!pet "file not found", 0
+
+dos_err_63:
+
+	!pet "file exists", 0
+
+dos_err_64:
+
+	!pet "file type mismatch", 0
+
+dos_err_65:
+
+	!pet "no block", 0
+
+dos_err_66:
+
+	!pet "illegal track and sector", 0
+
+dos_err_67:
+
+	!pet "illegal system t or s", 0
+
+dos_err_70:
+
+	!pet "no channel", 0
+
+dos_err_71:
+
+	!pet "directory error", 0
+
+dos_err_72:
+
+	!pet "partition full", 0
+
+dos_err_73:
+
+	!pet "dos mismatch", 0
+
+dos_err_74:
+
+	!pet "drive not ready", 0
+
+dos_err_75:
+
+	!pet "format error", 0
+
+dos_err_76:
+
+	!pet "controller error", 0
+
+dos_err_77:
+
+	!pet "selected partition illegal", 0
+
+dos_err_78:
+
+	!pet "system error", 0
+
+dos_err_79: ; SD2IEC compatible
+
+	!pet "image invalid", 0
@@ -3,6 +3,11 @@
 ; Initializes DOS. For detailed description see 'm65dos_bridge.s' file
 ;

+
+!set CONFIG_UNIT_FLOPPY  = 0 ; XXX floppy not supported yet
+!set CONFIG_UNIT_RAMDISK = 0 ; XXX RAM disk not supported yet
+
+
 dos_INIT:

 	; Set the magic string 'CBDOS'
@@ -0,0 +1,32 @@
+
+;
+; Check if DOS memory is not overwritten
+;
+
+
+dos_MEMCHK:
+
+	; Check for magic string
+
+	pha
+	phx
+
+	ldx #$04
+@1:
+	lda MAGICSTR, x
+	cmp dos_magicstr, x
+	bne @fail
+	dex
+	bpl @1
+
+	plx
+	pla
+	clc 
+	rts
+
+@fail:
+
+	plx
+	pla
+	sec
+	rts
@@ -1,42 +0,0 @@
-
-;
-; 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
@@ -4,58 +4,51 @@
 ;


-dos_CHKUNIT:
+dos_UNITCHK:

-	; Check for magic string
+	; Check if memory content is not damaged

-	pha
-	phx
-
-	ldx #$04
-@1:
-	lda MAGICSTR, x
-	cmp dos_magicstr, x
-	bne dos_CHKUNIT_mem_fail
-	dex
-	bpl @1
-
-	plx
-	pla
+	jsr dos_MEMCHK
+	bcs dos_UNITCHK_none

 	; Check for unit

 	cmp UNIT_SDCARD
-	beq dos_CHKUNIT_sdcard
+	beq dos_UNITCHK_sdcard
 	cmp UNIT_FLOPPY
-	beq dos_CHKUNIT_floppy
+	beq dos_UNITCHK_floppy
 	cmp UNIT_RAMDISK
-	beq dos_CHKUNIT_ramdisk
+	beq dos_UNITCHK_ramdisk
+
+	; FALLTROUGH
+
+dos_UNITCHK_none:

 	sec
 	rts

-dos_CHKUNIT_sdcard:
+dos_UNITCHK_sdcard:

 	lda #$00
 	+skip_2_bytes_trash_nvz

 	; FALLTROUGH

-dos_CHKUNIT_floppy:
+dos_UNITCHK_floppy:

 	lda #$01
 	+skip_2_bytes_trash_nvz

 	; FALLTROUGH

-dos_CHKUNIT_ramdisk:
+dos_UNITCHK_ramdisk:

 	lda #$02
 	
 	clc
 	rts

-dos_CHKUNIT_mem_fail:
+dos_UNITCHK_mem_fail:

 	plx
 	pla
@@ -0,0 +1,53 @@
+
+;
+; Unit number handling. For detailed description see 'm65dos_bridge.s' file
+;
+
+
+dos_UNITNUM:
+
+	; Check if memory content is not damaged
+
+	jsr dos_MEMCHK
+	bcs dos_UNITNUM_none
+
+	; Check what kind of device was requested
+
+	cmp #$00
+	beq dos_UNITNUM_sdcard
+	cmp #$01
+	beq dos_UNITNUM_floppy
+	cmp #$02
+	beq dos_UNITNUM_ramdisk
+
+	lda #$00
+
+	; FALLTROUGH
+
+dos_UNITNUM_none:
+
+	sec
+	rts
+
+dos_UNITNUM_sdcard:
+
+	lda UNIT_SDCARD
+
+	+skip_2_bytes_trash_nvz
+
+dos_UNITNUM_floppy:
+
+	lda UNIT_FLOPPY
+
+	+skip_2_bytes_trash_nvz
+
+dos_UNITNUM_ramdisk:
+
+	lda UNIT_RAMDISK
+
+	cmp #$00
+	beq dos_UNITNUM_none
+
+	clc
+	rts
+
@@ -0,0 +1,49 @@
+
+;
+; Unit number handling. For detailed description see 'm65dos_bridge.s' file
+;
+
+
+dos_UNITSET:
+
+	; Check if memory content is not damaged
+
+	jsr dos_MEMCHK
+	bcc @1
+	rts
+@1:
+	; Check what kind of device was requested
+
+	cmp #$00
+	beq dos_UNITSET_sdcard
+	; XXX devioces below are not implemented yet
+	; cmp #$01
+	; beq dos_UNITSET_floppy
+	; cmp #$02
+	; beq dos_UNITSET_ramdisk
+
+	sec
+	rts
+
+dos_UNITSET_sdcard:
+
+	stx UNIT_SDCARD
+	+skip_2_bytes_trash_nvz
+
+	; FALLTROUGH
+
+dos_UNITSET_floppy:
+
+	stx UNIT_FLOPPY
+	+skip_2_bytes_trash_nvz
+
+	; FALLTROUGH
+
+dos_UNITSET_ramdisk:
+
+	stx UNIT_RAMDISK
+
+	; FALLTROUGH
+
+	clc
+	rts