42 lines
1.0 KiB
ArmAsm
42 lines
1.0 KiB
ArmAsm
// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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//
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// Official Kernal routine, described in:
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//
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// - [RG64] C64 Programmers Reference Guide - page 296
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// - [CM64] Computes 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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// XXX cleanup: iec_cmd_open and iec_cmd_close should just do ORA and jump directly here
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SECOND:
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#if ROM_LAYOUT_M65
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jsr m65dos_check
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bcc_16 m65dos_second // branch if device is handeld by internal DOS
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#endif
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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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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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