From c3b0fa04a663fe233765b83d3be41a42aa08c25d Mon Sep 17 00:00:00 2001 From: "Juan J. Martinez" Date: Mon, 3 May 2021 08:21:10 +0100 Subject: Initial import for public release --- lib/cpcrslib/cpc_GetScrAddress.s | 65 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 lib/cpcrslib/cpc_GetScrAddress.s (limited to 'lib/cpcrslib/cpc_GetScrAddress.s') 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 + -- cgit v1.2.3