46 lines
820 B
ArmAsm
46 lines
820 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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// RS-232 part of the CLOSE routine
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//
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#if HAS_RS232
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#if CONFIG_MEMORY_MODEL_60K
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.error "CONFIG_MEMORY_MODEL_60K is not compatible with RS-232 memory allocation code"
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#endif
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close_rs232:
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// First check how many RS-232 channels are currently allocated.
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// If more than one, skip deallocation (other channels still uses the buffer).
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jsr rs232_count_channels
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cpx #$02 // set Carry if more than one is open
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bcs close_rs232_end
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// Deallocate buffer
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inc MEMSIZK+1
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inc MEMSIZK+1
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// XXX is this needed? check with original ROM what it actually does
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lda #$00
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sta ROBUF+0
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sta ROBUF+1
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sta RIBUF+0
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sta RIBUF+1
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close_rs232_end:
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jmp close_remove_from_table
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#endif // HAS_RS232
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