chris
f1df180bf8
TKSA ORed the accumulator with $90 before sending it. Its callers pass the secondary address plus $60, as the routine's own comment asks, so TKSA turned a TALK secondary address $60-$6F into $F0-$FF, the OPEN command, on the bus. The contract (C64 Programmer's Reference Guide, TKSA; Michael Steil, "Commodore Peripheral Bus: Part 2", https://www.pagetable.com/?p=1031, which gives TKSA's argument as A = $60 + secondary address): TKSA sends the byte in A as the secondary address to the device told to TALK. TKSA now sends A as it is. Upstream: https://github.com/MEGA65/open-roms/issues/116 (bug 1)
37 lines
942 B
ArmAsm
37 lines
942 B
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 302
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; - [CM64] Computes Mapping the Commodore 64 - page 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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TKSA:
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!ifdef CONFIG_MB_M65 {
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jsr m65dos_check
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+bcc m65dos_tksa ; branch if device is handeld by internal DOS
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}
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!ifdef 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_untlk_tksa
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} else {
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jmp kernalerror_ILLEGAL_DEVICE_NUMBER
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}
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