hbios - fix HB_SECTCK setting

Source/HBIOS/hbios.asm

@@ -1245,7 +1245,7 @@ HB_CPU1:
 	LD	(IVT(INT_TIM0)),HL	; Z180 TIMER 0
 
 	; SETUP PERIODIC TIMER INTERRUPT ON TIMER 0
-	LD	HL,CPUOSC/TICKSPERSEC/20-1	; 50HZ = 18432000/ 50 / 20
+	LD	HL,CPUOSC/TICKSPERSEC/20-1	; 50HZ = 18432000 / 50 / 20
 	LD	B,0
 	LD	C,Z180_RLDR0L		; INITIALIZE TIMER 0 RELOAD REGISTER
 	OUT	(C),L
@@ -2400,7 +2400,7 @@ SYS_GETTIMER:
 ;
 SYS_GETSECS:
 	LD	HL,HB_SECTCK
-	LD	A,TICKSPERSEC-1
+	LD	A,TICKSPERSEC
 	HB_DI
 	SUB	(HL)
 	INC	HL ; NOW POINTING TO HB_SECS
@@ -2752,7 +2752,7 @@ HB_TIMINT2:
 	DEC	(HL)			; COUNTDOWN 50 TICKS
 	JR	NZ,HB_TIMINT3		; NOT ZERO YET, DONE FOR THIS CYCLE
 	; 50 TICKS HAVE ELAPSED
-	LD	A,TICKSPERSEC-1		; 50 TICKS PER SECOND
+	LD	A,TICKSPERSEC		; 50 TICKS PER SECOND
 	LD	(HL),A			; RESET COUNTDOWN REGISTER
 	; INCREMENT SECONDS COUNTER
 	LD	HL,HB_SECS		; POINT TO SECONDS COUNTER
@@ -4062,7 +4062,7 @@ IDLECOUNT	.DB	0
 HEAPCURB	.DW	0		; MARK HEAP ADDRESS AFTER INITIALIZATION
 ;
 HB_TICKS	.FILL	4,0		; 32 BIT TICK COUNTER
-HB_SECTCK	.DB	TICKSPERSEC-1	; TICK COUNTER FOR FRACTIONAL SECONDS
+HB_SECTCK	.DB	TICKSPERSEC	; TICK COUNTER FOR FRACTIONAL SECONDS
 HB_SECS		.FILL	4,0		; 32 BIT SECONDS COUNTER
 ;
 HB_CPUTYPE	.DB	0		; 0=Z80, 1=80180, 2=SL1960, 3=ASCI BRG