mirror of https://github.com/GnoConsortium/gno.git
107 lines
2.2 KiB
NASM
107 lines
2.2 KiB
NASM
case on
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mcopy findfpcp.mac
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*
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* Find the slot the FPE or NumberCruncher card is in
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*
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* Returns the slot number or -1 if FPCP card cannot be found.
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*
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* For slots 1-5 and 7, findfpcp() can find the card
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* regardless of the Slot setting in the Control Panel.
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* For slot 6, the Control Panel must be set to "Your Card"
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* for the function to be able to find the card.
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*
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* Written in 1997 by Soenke Behrens, from Merlin code by
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* Albert Chin-A-Young
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* This code is hereby place into the Public Domain
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*
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*
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* Dummy function to take care of findfpcp.root, which
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* can then be discarded.
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*
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dummy start
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end
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****************************************************************
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*
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* int findfpcp (void);
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*
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* Find slot FPCP card is in
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*
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* See also: Floating-Point Coprocessor Manual by Albert
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* Chin-A-Young
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*
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****************************************************************
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*
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findfpcp start
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SETINTC3ROM equ $e1c00a ; enable internal slot 3 ROM
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SETSLOTC3ROM equ $e1c00b ; enable external slot 3 ROM
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RDC3ROM equ $e1c017 ; bit 7 = 1 if slot c3 space enabled
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SLTROMSEL equ $e1c02d ; slot ROM select
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csub
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sei Disable interrupts
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short m 8-bit accumulator
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lda #0 enable slot 3 ROM as FPCP
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sta SETSLOTC3ROM might be in slot 3
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lab1 lda RDC3ROM wait for external slot 3
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bpl lab1 space to be enabled
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lda SLTROMSEL store previous value in Y
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tay
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ora #%10110110 enable slot 1, 2, 4, 5, 7 ROM
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sta SLTROMSEL
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long m 16-bit accumulator
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ldx #$c100 Start with slot 1
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search lda $e00004,x read slot at address $04,
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cmp id_bytes $06 and $0b. If no match
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bne next_slot is found, exit, else set up
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lda $e00006,x base address
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cmp id_bytes+2
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bne next_slot
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lda $e0000b,x
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cmp id_bytes+4
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beq found
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next_slot txa try next slot
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clc
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adc #$100
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tax
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cmp #$c000 last slot + $100
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bne search
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lda #$FFFF
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sta slot_num store -1 to
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bra end indicate FPCP not found
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found txa slot number of FPCP
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xba
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and #$0f strip slot number
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sta slot_num save slot number
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end short m
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lda #0 re-enable internal slot 3 ROM
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sta SETINTC3ROM
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lab2 lda RDC3ROM wait for internal slot 3
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bmi lab2 space to be enabled
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tya re-enable other internal
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sta SLTROMSEL slot ROM
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long m
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cli re-enable interrupts
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ret 2:slot_num
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id_bytes anop
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dc h'3838'
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dc h'1818'
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dc h'01af'
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slot_num ds 2
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end
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