ftp.nice.ch/pub/next/tools/emulators/vice.0.15.0.NeXT.sd.tgz#/vice-0.15.0/src/acia.h

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/*
 *
 * This file is part of Commodore 64 emulator.
 * See README for copyright notice
 *
 * ACIA 6551 register number declarations.
 * Interrupt signals are defined in vmachine.h.
 *
 * Written by
 *    Andre Fachat (a.fachat@physik.tu-chemnitz.de)
 *
 */

#define   ACIA_DR   0		/* Data register */
#define   ACIA_SR   1		/* R: status register W: programmed Reset */
#define   ACIA_CMD  2		/* Command register */
#define   ACIA_CTRL 3		/* Control register */

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.