Initial import for public releaseHEADmain

1 files changed, 65 insertions, 0 deletions

diff --git a/lib/cpcrslib/cpc_GetScrAddress.s b/lib/cpcrslib/cpc_GetScrAddress.s
new file mode 100644
index 0000000..42b17f7
--- /dev/null
+++ b/lib/cpcrslib/cpc_GetScrAddress.s
@@ -0,0 +1,65 @@
+.globl _cpc_GetScrAddress
+
+_cpc_GetScrAddress::
+
+;	LD IX,#2
+;	ADD IX,SP
+;	LD A,0 (IX)
+;	LD L,1 (IX)	;pantalla
+
+
+	LD HL,#2
+    ADD HL,SP
+	LD A,(HL)
+	INC HL
+	LD L,(HL)
+	;LD L,E
+	;JP cpc_GetScrAddress0
+
+
+cpc_GetScrAddress0:			;en HL están las coordenadas
+
+	;LD A,H
+	LD (#inc_ancho+1),A
+	LD A,L
+	SRL A
+	SRL A
+	SRL A
+	; A indica el bloque a multiplicar x &50
+	LD D,A						;D
+	SLA A
+	SLA A
+	SLA A
+	SUB L
+	NEG
+	; A indica el desplazamiento a multiplicar x &800
+	LD E,A						;E
+	LD L,D
+	LD H,#0
+	ADD HL,HL
+	LD BC,#bloques
+	ADD HL,BC
+	;HL APUNTA AL BLOQUE BUSCADO
+	LD C,(HL)
+	INC HL
+	LD H,(HL)
+	LD L,C
+	;HL TIENE EL VALOR DEL BLOQUE DE 8 BUSCADO
+	PUSH HL
+	LD D,#0
+	LD HL,#sub_bloques
+	ADD HL,DE
+	LD A,(HL)
+	POP HL
+	ADD H
+	LD H,A
+inc_ancho:
+	LD E,#0
+	ADD HL,DE
+	RET
+
+bloques:
+.DW #0XC000,#0XC050,#0XC0A0,#0XC0F0,#0XC140,#0XC190,#0XC1E0,#0XC230,#0XC280,#0XC2D0,#0XC320,#0XC370,#0XC3C0,#0XC410,#0XC460,#0XC4B0,#0XC500,#0XC550,#0XC5A0,#0XC5F0,#0XC640,#0XC690,#0XC6E0,#0XC730,#0XC780
+sub_bloques:
+.DB #0X00,#0X08,#0X10,#0X18,#0X20,#0X28,#0X30,#0X38
+