77 lines
1019 B
ArmAsm
77 lines
1019 B
ArmAsm
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//
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// Official Kernal routines, described in:
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//
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// - [RG64] C64 Programmer's Reference Guide - page 276
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// - [CM64] Compute's Mapping the Commodore 64 - page 229
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//
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// CPU registers that has to be preserved (see [RG64]): .Y, .A (see [CM64], page 213)
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//
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CKOUT:
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// Store registers for preservation
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pha
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phy_trash_a
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// Reset status
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jsr kernalstatus_reset
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// First retrieve the FAT/LAT/SAT table index (and check if file is open)
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txa
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jsr find_fls
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bcs_far chkinout_file_not_open
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// Now we have table index in Y
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lda FAT,Y
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// Handle all the devices
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beq ckout_file_not_output // 0 - keyboard
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// Tape not supported here
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#if HAS_RS232
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cmp #$02
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beq_far ckout_rs232
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#endif // HAS_RS232
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#if CONFIG_IEC
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jsr iec_check_devnum_oc
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bcc_far ckout_iec
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#endif // CONFIG_IEC
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cmp #$03 // screen - only legal one left
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bne_far chkinout_device_not_present
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ckout_set_device:
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lda FAT,Y
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sta DFLTO
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jmp chkinout_end
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ckout_file_not_output:
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ply_trash_a
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pla
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jmp kernalerror_FILE_NOT_OUTPUT
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