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Video test
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Video test
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.CPU z80
.ORG $0000
JP $0100
.ORG $0066
JP $0100
;
.ORG $0100
DI
; Setup PIA to video window (code from OSBORNE 1 ROM 1.3)
CALL SPAO
LD C,$EA
CALL OPAD
XOR A
LD C,A
CALL OPBD
BEGIN: LD hl,$F000-1
LD bc,$FFFF
TEST: INC hl
LD (hl)," "
LD a,h
CP b
JP nz,TEST
LD a,l
CP c
JP nz,TEST
; Video memory filled with blank ASCII characters - now fill with test pattern
LD hl,LINE1
LD de,$f000
LD bc,$0080
LDIR
LD hl,LINE2_23
LD de,$f080
LD bc,$0080
LOOP: LDIR
LD bc,$0080
LD hl,LINE2_23
LD a,d
CP $fb
JP nz,loop
LD a,e
CP $80
JP nz,LOOP
LD hl,LINE24
LD de,$fb80
LD bc,$0080
LDIR
LD hl,$f000
LOOP2: LD a,(hl)
OR %10000000
ENADIM
LD (hl),a
DISDIM
INC hl
LD a,h
CP $FF
JP nz,LOOP2
LD a,l
CP $ff
JP nz,loop2
HALT
.MACRO ENADIM
OUT ($02),a
.ENDM
.MACRO DISDIM
OUT ($03),a
.ENDM
SPAO:
LD A,$03
LD ($2C01),a
LD A,$FF
LD ($2C00),a
LD A,$00
LD ($2C03),a
LD A,$FF
LD ($2C02),a
RET
OPAD:
LD a,4+3
LD ($2C01),a
LD a,c
LD ($2C00),a
RET
OPBD:
LD a,4
LD ($2C03),a
LD a,c
LD ($2C02),a
RET
LINE1:
; 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
DB $07,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18
DB $18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18
DB $18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18,$18
DB $18,$18,$18,$06,"x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
LINE2_23:
DB $04,"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O"
DB "P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e"
DB "f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u"
DB "v","w","x",$01,"x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
LINE24:
DB $14,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17
DB $17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17
DB $17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17,$17
DB $17,$17,$17,$12,"x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"
DB "x","x","x","x","x","x","x","x","x","x","x","x","x","x","x","x"