From 114236da17868d0ebd866da16556ae82a0da2ad6 Mon Sep 17 00:00:00 2001
From: Kenneth J Davis <PerditionC@gmail.com>
Date: Sat, 10 Feb 2024 17:36:33 -0500
Subject: [PATCH] allow selection of COM port for debug prints easily
 overridden during compile, e.g. build.bat /D DEBUG_PRINT_COMPORT /V 2

---
 kernel/console.asm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/console.asm b/kernel/console.asm
index 4287fc3..ce469ec 100644
--- a/kernel/console.asm
+++ b/kernel/console.asm
@@ -265,9 +265,14 @@ _int29_handler:
                 pop     ax
                 iret
 %IFDEF DEBUG_PRINT_COMPORT
+%ifnum DEBUG_PRINT_COMPORT
+%define DEBUG_USE_COMPORT DEBUG_PRINT_COMPORT
+%else
+%define DEBUG_USE_COMPORT 1                    ; default to COM2 if not specified
+%endif
 .comprint:
                 push    dx
-                mov     dx, 1                   ; 0=COM1,1=COM2,2=COM3,3=COM4
+                mov     dx, DEBUG_USE_COMPORT  ; 0=COM1,1=COM2,2=COM3,3=COM4
 
                 mov     ah, [cs:ASYNC_NEED_INIT]
                 or      ah,ah