mirror of
https://github.com/romychs/SprinterESP.git
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80 lines
1.7 KiB
NASM
80 lines
1.7 KiB
NASM
; ======================================================
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; ISA Library for Sprinter computer
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; By Roman Boykov. Copyright (c) 2024
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; https://github.com/romychs
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; License: BSD 3-Clause
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; ======================================================
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PORT_ISA EQU 0x9FBD
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PORT_SYSTEM EQU 0x1FFD
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ISA_BASE_A EQU 0xC000 ; Базовый адрес портов ISA в памяти
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; --- PORT_ISA bits
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ISA_A14 EQU 0x01
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ISA_A15 EQU 0x02
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ISA_A16 EQU 0x04
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ISA_A17 EQU 0x08
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ISA_A18 EQU 0x10
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ISA_A19 EQU 0x20
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ISA_AEN EQU 0x40
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ISA_RST EQU 0x80
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MODULE ISA
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; ------------------------------------------------------
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; Reset ISA device
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; ------------------------------------------------------
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ISA_RESET
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LD BC, PORT_ISA
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LD A,ISA_RST | ISA_AEN ; RESET=1 AEN=1
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OUT (C), A
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CALL UTIL.DELAY_1MS
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XOR A
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OUT (C), A ; RESET=0 AEN=0
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LD HL,100
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CALL UTIL.DELAY
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RET
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; ------------------------------------------------------
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; Open access to ISA ports as memory
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; Inp: A = 0 - ISA slot 0, 1 - ISA SLOT 1
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; ------------------------------------------------------
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ISA_OPEN
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PUSH AF,BC
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LD BC, PAGE3
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IN A,(C)
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LD (SAVE_MMU3), A
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LD BC, PORT_SYSTEM
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LD A, 0x11
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OUT (C), A
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ISA_SLOT+* LD A,0x01
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SLA A
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OR A, 0xD4 ; D4 - ISA1, D6 - ISA2
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LD BC, PAGE3
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OUT (C), A
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LD BC, PORT_ISA
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XOR A
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OUT (C), A
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POP BC,AF
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RET
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; ------------------------------------------------------
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; Close access to ISA ports
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; ------------------------------------------------------
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ISA_CLOSE
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PUSH AF,BC
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LD A,0x01
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LD BC,PORT_SYSTEM
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OUT (C),A
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LD BC,PAGE3
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LD A,(SAVE_MMU3)
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OUT (C),A
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POP BC,AF
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RET
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; To save memory page 3
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SAVE_MMU3 DB 0
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ENDMODULE |