more work on SD card support

src/aliases/,aliases_hardware_m65.s

@@ -66,4 +66,30 @@
 	!set __SID_R2_OFFSET = $20 ; right SID 2, $D420
 	!set __SID_L1_OFFSET = $40 ; left  SID 1, $D440
 	!set __SID_L2_OFFSET = $60 ; left  SID 2, $D460
+
+
+
+	; SD card commands
+	;
+	; XXX command codes taken from XEMU emulator, to be updated when official documentation exists
+
+	!set CARD_CMD_RESET        = $00 ; reset SD card
+	!set CARD_CMD_RESET_FL     = $10 ; reset with flags, XXX what's this?
+	!set CARD_CMD_END_RESET    = $01 ; end reset
+	!set CARD_CMD_END_RESET_FL = $11 ; end reset with flags
+	!set CARD_CMD_READ         = $02 ; read sector
+	!set CARD_CMD_WRITE        = $03 ; write sector
+	!set CARD_CMD_WRITE_1      = $04 ; multi-sector write, 1st sector
+	!set CARD_CMD_WRITE_2      = $05 ; multi-sector write
+	!set CARD_CMD_WRITE_3      = $06 ; multi-sector write, last sector
+	!set CARD_CMD_FLUSH        = $0C
+	!set CARD_CMD_SDHC_OFF     = $40 ; for older cores only?
+	!set CARD_CMD_SDHC_ON      = $41 ; for older cores only?
+	                                 ; XXX $44, $45 - completely unclear to me
+	!set CARD_CMD_MAP_BUF      = $81
+	!set CARD_CMD_UNMAP_BUF    = $82
+	!set CARD_CMD_FILL_ON      = $83
+	!set CARD_CMD_FILL_OFF     = $84
+	!set CARD_CMD_SELECT_INT   = $C0 ; select internal slot
+	!set CARD_CMD_SELECT_EXT   = $C1 ; select external slot
 }