ACIA Interrupt Fix & ROMless APPBOOT Fix

- ACIA driver was not properly returning ZF to indicate if it handled an interrupt.
- APPBOOT was failing on ROMless systems because it was copying the HBIOS code overtop of itself.

Source/HBIOS/acia.asm

@@ -180,8 +180,8 @@ ACIA_INTRCV:
         ; CHECK TO SEE IF SOMETHING IS ACTUALLY THERE
         LD      C,(IY+3)                ; CMD/STAT PORT TO C
         IN      A,(C)                   ; GET STATUS
-        RRA                             ; READY BIT TO CF
-        RET     NC                      ; NOTHING AVAILABLE ON CURRENT CHANNEL
+	AND	$01			; ISOLATE READY BIT
+	RET	Z			; IF NOT READY, RET W/ ZF SET (INT NOT HANDLED)
 ;
 ACIA_INTRCV1:
         ; RECEIVE CHARACTER INTO BUFFER

Source/HBIOS/hbios.asm

@@ -1602,21 +1602,17 @@ MBC_SINGLE:
 ;
 #ENDIF
 ;
-; IF ALREADY EXECUTING IN RAM, BYPASS RAM BANK INSTALLATION
-;
-	LD	A,(HB_RAMFLAG)
-	OR	A
-	JR	NZ,HB_START1
-;
-; IF BID_BOOT AND BID_BIOS ARE THE SAME, THEN IT IS NEVER APPROPRIATE
-; TO COPY THE HBIOS IMAGE FROM BID_BOOT TO BID_BIOS.  THIS IS TYPICALLY
-; THE CASE FOR A ROMLESS SYSTEM.
-;
-#IF (BID_BOOT != BID_BIOS)
-;
 ; INSTALL HBIOS IN RAM BANK
 ;
 	LD	A,(HB_CURBNK)
+;
+	; CHECK TO SEE IF WE ARE ALREADY RUNNING IN THE HBIOS
+	; BANK AND SKIP THE COPY IF SO (DON'T COPY OVER OURSELVES).
+	; THIS SITUATION OCCURS ON A ROMLESS STARTUP OR WHEN DOING A
+	; FULL RESTART OF A SYSTEM USING THE EXISTING HBIOS COPY.
+	CP	BID_BIOS
+	JR	Z,HB_START1
+;
 	LD	(HB_SRCBNK),A
 	LD	A,BID_BIOS
 	LD	(HB_DSTBNK),A
@@ -1643,10 +1639,6 @@ MBC_SINGLE:
 	HALT				; WE SHOULD NOT COME BACK HERE!
 #ENDIF
 ;
-#ENDIF
-;
-HB_RAMFLAG	.DB	FALSE		; INITIALLY FALSE, SET TO TRUE BELOW AFTER RAM TRANSITION
-;
 ; EXECUTION RESUMES HERE AFTER SWITCH TO RAM BANK
 ;
 HB_START1:				; BNKCALL ARRIVES HERE, BUT NOW RUNNING IN RAM BANK

Source/ver.inc

@@ -2,7 +2,7 @@
 #DEFINE	RMN	4
 #DEFINE	RUP	0
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.4.0-dev.16"
+#DEFINE BIOSVER	"3.4.0-dev.17"
 #define rmj	RMJ
 #define rmn	RMN
 #define rup	RUP

Source/ver.lib

@@ -3,5 +3,5 @@ rmn	equ	4
 rup	equ	0
 rtp	equ	0
 biosver	macro
-	db	"3.4.0-dev.16"
+	db	"3.4.0-dev.17"
 	endm