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6216.asm
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6216.asm
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ORG #8000
;
;-------------------------------------
;Port A: Data FLASH
;Port B: Set High & Low Byte of FLASH Address
;Port C: 0 - BANK 0-1
; 1 - BANK 2-3
; 2 - /STROB (Latch Low Byte )
; 3 - /WE (Write Enable)
; 4 - /CS or /CE (Chip Select)
; 5 - /OE
; 6 - ---
; 7 - ---
;Mask #FC
;=====================
PORTA EQU #1F
PORTB EQU #3F
PORTC EQU #5F
PORTSET EQU #7F
BORDER EQU 0
BORDER2 EQU 7
;---------------------
DI
LD A,BORDER
OUT (#FE),A
LD A,#80
OUT (PORTSET),A
XOR A
OUT (PORTA),A
OUT (PORTB),A
DEC A
OUT (PORTC),A
IN A,(PORTA)
AND A
JP NZ,ERREXIT
LD C,PORTA
CALL TESTP
JP C,ERREXIT
LD C,PORTB
CALL TESTP
JP C,ERREXIT
LD C,PORTC
CALL TESTP
JP C,ERREXIT
LD A,#FF
OUT (PORTA),A
OUT (PORTB),A
OUT (PORTC),A
;==========
LD B,32
LD IX,TABLEB
LOOPTST
PUSH BC
LD HL,#D000
LD A,(IX)
CALL FILLPAGE
LD A,2
OUT (#FE),A
LD DE,#D000 ;Write From
CALL WRITE2K
XOR A
OUT (#FE),A
LD HL,#C000
CALL CLSPAGE
LD DE,#C000 ;Read To
CALL READ2K
CALL COMPARE
POP BC
JP C,ERREXIT
INC IX
DJNZ LOOPTST
EI
RET
ERREXIT
LD A,BORDER2
OUT (#FE),A
EI
RET
;
TABLEB
DEFB #00,#FF,#0F,#F0,#AA,#55,#A5,#5A
DEFB #01,#02,#04,#08,#10,#20,#40,#80
DEFB #0A,#05,#A0,#50,#FA,#F5,#AF,#A5
DEFB #00,#FF,#00,#FF,#00,#FF,#00,#FF
;-------------------------
TESTP
LD B,0
TESTP0 OUT (C),B
IN A,(C)
CP B
JR NZ,TESTP1
DJNZ TESTP0
AND A
RET
TESTP1
SCF
RET
;----- Read 2Kb RAM --------
READ2K
LD HL,0
LD B,8
READ2KL
PUSH BC
CALL READ256
INC D
INC H
POP BC
DJNZ READ2KL
RET
;------- Read 256 Bytes -------
READ256
LD C,PORTB
SET 3,H ;A11=1 -> Read Mode
OUT (C),H
LD A,#FB
OUT (PORTC),A ;Latch High Byte
LD A,#FF
OUT (PORTC),A
;
LD B,0 ;Read 256 Byte
LD C,PORTC
LOOP_256
LD A,E
OUT (PORTB),A ;Set Low Addr
LD A,#CF
OUT (C),A ;/CS & /OE = 0
IN A,(PORTA) ;Read Byte
LD (DE),A
INC E
LD A,#FF ;/CS & /OE = 1
OUT (C),A
DJNZ LOOP_256
RET
;------- Read 1 Byte ---------
READ1
LD C,PORTB ;Latch Addr
SET 3,H ;A11=1 -> Read Mode
OUT (C),H
LD A,#FB
OUT (PORTC),A ;Latch High Byte
LD A,#FF
OUT (PORTC),A
OUT (C),L ;Set Low Byte
;
LD C,PORTC ;Read Byte
LD A,#CF
OUT (C),A
IN A,(PORTA)
LD B,#FF
OUT (C),B
RET
;------- Write 2Kb RAM -------
WRITE2K
LD HL,0 ;ADR WRITE
WRITE2KL
LD A,(DE)
CALL WRITE1
INC DE
INC HL
BIT 3,H
JR Z,WRITE2KL
RET
;----- Write 1 Byte ------
WRITE1
OUT (PORTA),A
RES 3,H ;A11=0 -> Write Mode
LD A,H
OUT (PORTB),A
LD A,#FB
OUT (PORTC),A ;Latch High Byte
LD A,#FF
OUT (PORTC),A
LD A,L
OUT (PORTB),A ;Set Low Byte
LD A,#CF
OUT (PORTC),A
LD A,#FF
OUT (PORTC),A
RET
FILLPAGE
LD E,L
LD D,H
INC DE
INC DE
LD (HL),A
INC HL
CPL
LD (HL),A
DEC HL
LD BC,#0FFF
LDIR
RET
CLSPAGE
LD E,L
LD D,H
INC DE
LD (HL),0
LD BC,#0FFF
LDIR
RET
COMPARE
LD HL,#C000
LD DE,#D000
LD BC,#0800
COMPARL
LD A,(DE)
CP (HL)
JR NZ,COMPERR
INC HL
INC DE
DEC BC
LD A,C
OR B
JR NZ,COMPARL
AND A
RET
COMPERR
SCF
RET