Fix WRERR Routine in XModem per HubertH

- WRERR was putting the CAN character in register C to send.  However, it needs to be in register A.  Fixed here.  Credit and thanks to HubertH for finding this and providing the fix.

Doc/ChangeLog.txt

@@ -46,6 +46,7 @@ Version 3.5
 - M?R: Added REBOOT application
 - MAP: Significant improvement in Disk Catalog document
 - MAP: Added Disk Image for the Z3PLUS (Z-System for CP/M-Plus) os.
+- H?H: Fix XModem 12.3 WRERR to put CAN char in proper register to send.
 
 Version 3.4
 -----------

Source/Apps/XM/xmdm125.asm

@@ -3478,7 +3478,17 @@ RSDMA:	LXI	D,TBUF		; Reset DMA address
 	RET
 ;
 WRERR:	CALL	RSDMA		; Reset DMA to normal
-	MVI	C,CAN		; Cancel
+; [WBW] BEGIN: Fixed to put CAN character in A instead of C because
+; SEND uses the A register.  Also increased number of CAN characters
+; sent to 3.  Credit to HubertH for finding this and providing the fix.
+;	MVI	C,CAN		; Cancel
+; [WBW] -----
+	MVI	A,CAN		; Cancel
+	CALL	SEND		; Sender
+	MVI	A,CAN		; Cancel
+	CALL	SEND		; Sender
+	MVI	A,CAN		; Cancel
+; [WBW] END
 	CALL	SEND		; Sender
 ; [WBW] BEGIN: RCVSABT does not return, so file write error
 ; message was never being displayed.  Swapped things around