Fix Z280 Cold Restart

Source/HBIOS/hbios.asm

@@ -666,6 +666,30 @@ HBX_PPRET:
 HBX_PPSP	.EQU	$ - 2
 	RET
 ;
+; SPECIAL ROUTINE IN HIGH MEMORY TO PERFORM A COLD START ON Z280
+; THIS REQUIRES US TO REMAP LOW MEMORY, THEN JUMP TO ZERO
+;
+#IF (MEMMGR == MM_Z280)
+;
+Z280_RESTART:
+	DI				; KILL INTERRUPTS
+	LD	SP,HBX_LOC		; STACK IN HIGH MEMORY
+;
+	; RELOCATE Z280 BANK SELECT TO HIGH MEMORY
+	LD	HL,Z280_BNKSEL
+	LD	DE,$8000
+	LD	BC,Z280_BNKSEL_LEN
+	LDIR
+;
+	; MAKE ROM BOOT BANK ACTIVE IN LOW SYS MEM
+	LD	A,BID_BOOT
+	LD	B,$10			; FIRST SYS PDR
+	CALL	$8000			; DO IT
+;
+	; NOW JUST JUMP TO START OF ROM BOOT CODE
+	JP	0
+#ENDIF
+;
 ; PRIVATE STACK AT END OF HBIOS CODE
 ; OCCUPIES SPACE BEFORE IVT
 ;
@@ -2944,11 +2968,15 @@ SYS_RESWARM:
 ; RESTART SYSTEM AS THOUGH POWER HAD JUST BEEN TURNED ON
 ;
 SYS_RESCOLD:
+#IF (MEMMGR == MM_Z280)
+	JP	Z280_RESTART
+#ELSE
 	DI
 	LD	SP,HBX_LOC		; STACK JUST BELOW HBIOS PROXY
 	LD	A,BID_BOOT		; BOOT BANK
 	LD	IX,0			; ADDRESS ZERO
 	CALL	HB_BNKCALL		; DOES NOT RETURN
+#ENDIF
 ;
 ; HOOK CALLED WHEN A USERLAND RESET IS INVOKED, TYPICALLY VIA A JUMP
 ; TO LOGICAL CPU ADDRESS $0000
@@ -4193,6 +4221,9 @@ Z280_IVT:
 ; REG A HAS BANK ID, REG B HAS INITIAL PDR TO PROGRAM
 ; REGISTERS AF, BC, HL DESTROYED
 ;
+; THIS ROUTINE MAY BE RELOCATED TO RUN IN HIGH MEMORY IN CERTAIN CASES
+; LIKE A SYSTEM RESTART.  IT MUST BE KEPT ENTIRELY RELOCATABLE.
+;
 Z280_BNKSEL:
 	; *DEBUG*
 	;CALL	PC_LBKT
@@ -4259,6 +4290,9 @@ Z280_BNKSEL3:
 	LDCTL	(C),HL
 ;
 	RET
+;
+Z280_BNKSEL_LEN	.EQU	$ - Z280_BNKSEL
+;
 #ENDIF
 ;
 ; Z280 BANK COPY (CALLED FROM PROXY)

Source/ver.inc

@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.56"
+#DEFINE BIOSVER	"3.1.1-pre.57"

Source/ver.lib

@@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.56"
+	db	"3.1.1-pre.57"
 	endm