31 lines
847 B
ArmAsm
31 lines
847 B
ArmAsm
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//
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// Official Kernal routine, described in:
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//
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// - [RG64] C64 Programmer's Reference Guide - page 296
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// - [CM64] Compute's Mapping the Commodore 64 - page 223/224
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// - https://www.pagetable.com/?p=1031, , https://github.com/mist64/cbmbus_doc
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//
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// CPU registers that has to be preserved (see [RG64]): .X, .Y
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//
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SECOND:
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#if CONFIG_IEC
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// Due to OPEN/CLOSE/TKSA/SECOND command encoding, allowed channels are 0-15; it is the caller
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// responsibility, hovewer, to provide value ORed with $60
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// - https://www.lemon64.com/forum/viewtopic.php?t=57694&sid=531ba3592bcffadef2ac8b9162f2e529
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// - https://www.pagetable.com/?p=1031 (Kernal API description)
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// XXX consider checking whether value is in range (contrary to original ROM implementation)
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jmp common_open_close_unlsn_second
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#else
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jmp kernalerror_ILLEGAL_DEVICE_NUMBER
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#endif
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