From 888e101fb4b343595fdfe8a1ef64024671fcebc8 Mon Sep 17 00:00:00 2001
From: RICCARDO <rigreco@live.com>
Date: Fri, 9 Oct 2020 22:29:54 +0200
Subject: [PATCH] Copy Conv3p to FP-operations

---
 AppleII/FP-operations/Conv3p.S | 143 +++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 AppleII/FP-operations/Conv3p.S

diff --git a/AppleII/FP-operations/Conv3p.S b/AppleII/FP-operations/Conv3p.S
new file mode 100644
index 0000000..9cbc2c0
--- /dev/null
+++ b/AppleII/FP-operations/Conv3p.S
@@ -0,0 +1,143 @@
+* @com.wudsn.ide.asm.hardware=APPLE2
+************************************
+* 	BASIC TO FAC TO FP1        *
+*          X=NUMBER		   *
+*          CALL 32768,X 768,X      *
+************************************
+		org $8000
+		
+CHKCOM		equ $DEBE
+FRMNUM		equ $DD67
+PTRGET		equ $DFE3
+MOVMF		equ $EB2B
+MOVFM		equ $EAF9
+
+** Woz FP Accumulator 4 Byte + 1 Byte Extra + 1 Byte SIGN**
+FP1		equ $FA	;Translate F8 --> FA
+E		equ $FE ;Translate FC --> FE
+SIGN		equ $EB
+
+FP2		equ $EC
+
+** Applesoft FP Accumulator 5 Byte + 1 Byte Sign **
+FAC		equ $9D
+
+RSLT		equ $7000
+
+		***************************
+
+ENTRY1		jsr CHKCOM
+		jsr FRMNUM	;VARIABLE X ->FAC (6 Byte Unpacked)
+
+** FPC to FP1 conversion **
+
+		lda FAC
+		dec A		; dec the EXP
+		sta FP1
+		sta FP2 ; Copy
+		
+		lda FAC+5
+		bmi NEG		; chk the Hi bit of 1 byte Mantissa
+
+POS		clc		; Hi bit 0 for negative
+		lda FAC+5
+		
+		ora #$80	; Set Hi Bit 1 byte Mantissa (change Sign only if is positive)
+		ror		; Didide for 2^1
+		
+		sta FP1+1
+		sta FP2+1 ; Copy
+		
+		jmp CONT
+
+NEG		clc		; Hi bit 1 for positive
+		lda FAC+5
+		
+		ror		; Didide for 2^1
+		
+		eor #$FF	; One's complement, NOT
+		clc
+		adc #01		; Two's complement, +1
+		
+		sta FP1+1
+		sta FP2+1 ; Copy		
+		
+CONT		lda FAC+2
+		ror
+		sta FP1+2
+		sta FP2+2 ; Copy
+		
+		lda FAC+3
+		ror
+		sta FP1+3
+		sta FP2+3 ; Copy FP2=FP1 X2=X1
+		
+		lda FAC+4
+		ror
+		sta E
+	
+		;brk
+		rts
+
+************************************
+* 	FP1 TO FAC TO BASIC        *
+*          CALL 32831,Y 831,Y 	   *
+*	   PRINT Y		   *
+************************************
+
+*
+** FP1 to FAC conversion **
+*
+ENTRY2		lda RSLT		; X1 1 Byte --> 9D FAC
+		inc A		; 2^(FP1+1) inc EXP
+		sta FAC
+		
+		lda RSLT+1
+		bmi NEG2	; chk the Hi bit of 1 byte Mantissa
+		
+		
+POS2		clc
+		lda RSLT+1	; M1 Hi 2 Byte --> 9E FAC
+		rol		; Multiply for 2^1
+		
+		ora #$80	; Set Hi Bit 1 byte Mantissa (change Sign only if is positive)
+		sta FAC+1	; To 6^ Byte of FAC Unpacked
+		
+		;sta FAC+5	; To 1^ Byte Mantissa of FAC UnPacked
+		jmp CONT2
+
+NEG2		lda RSLT+1
+
+		sec			
+		sbc #01		; One's complement inv -1
+		eor #$FF	; Two's complement inv NOT
+
+		rol		; Multiply for 2^1
+		
+		sta FAC+1	; To 1^ Byte Mantissa of FAC Packed
+		sta FAC+5	; To 6^ Byte of FAC Unpacked		
+		
+		
+CONT2		lda RSLT+2	; M1 3 Byte --> 9F FAC
+		rol
+		sta FAC+2
+		
+		lda RSLT+3	; M1 Lo 4 Byte --> A0 FAC
+		rol
+		sta FAC+3
+		
+		lda E		; Extra 5 Byte --> A1 FAC
+		rol
+		sta FAC+4
+		
+		;brk
+		***************************
+*
+		jsr CHKCOM
+		jsr PTRGET	; Return the Y and A pointing to the specific variabile
+		tax
+		jsr MOVMF	;FAC->VARIABLE Y (5 Bytes Packed)
+		
+		;brk
+		rts
+		chk
\ No newline at end of file