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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; TI-73/82/83/83+/84+/85/86 ROM Dumper
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;;; Copyright (c) 2012 Benjamin Moody
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;;; This program is free software; you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 2 of the License, or
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;;; (at your option) any later version.
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;;; This program is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;; Check whether we are receiving data from the link port.
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;; - Zero flag clear (NZ) if we are receiving data
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;; Read a byte from the link port.
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;; - Carry flag set if there was an error
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;; - Interrupts disabled
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;; Read a byte from the link port.
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;; - A = C = byte value to write
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;; - Carry flag set if there was an error
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;; - Interrupts disabled