Update std.asm

Add support for changing default console through config.

Source/HBIOS/std.asm

@@ -267,6 +267,13 @@ IVT_PIO1	.EQU	20
 IVT_PIO2	.EQU	22
 IVT_PIO3	.EQU	24
 ;
+; DEVICE DRIVER TO BE INITIALIZED FIRST. FIRST CIO DRIVER, UNIT 0 INITIALIZED BECOMES PRIMARY CONSOLE.
+; IS AN INDEX INTO THE ENABLED INITIALIZATION DRIVER LIST i.e. ASCI, UART, SIO, ACIA, PIO, UF ETC.
+; EXAMPLE: IF ONLY UART, SIO AND PIO ARE ENABLE AND THE SIO IS DESIRED AS THE PRIMARY CONSOLE, 
+; SET FORCECON TO 2 IN YOUR CUSTOM CONFIGURATION FILE i.e. "FORCECON: .SET 2"
+;
+FORCECON	.EQU	0	; DEFAULT IS TO FOLLOW NORMAL SEQUENCE
+;
 #INCLUDE "build.inc"			; INCLUDE USER CONFIG, ADD VARIANT, TIMESTAMP, & ROMSIZE
 ;
 #IF ((PLATFORM == PLT_N8) | (PLATFORM == PLT_MK4) | (PLATFORM == PLT_RCZ180))