1 /*****************************************************************************/
5 /* Internal include file, do not use directly */
9 /* (C) 2004 Stefan Haubenthal <polluks@sdf.lonestar.org> */
12 /* This software is provided 'as-is', without any expressed or implied */
13 /* warranty. In no event will the authors be held liable for any damages */
14 /* arising from the use of this software. */
16 /* Permission is granted to anyone to use this software for any purpose, */
17 /* including commercial applications, and to alter it and redistribute it */
18 /* freely, subject to the following restrictions: */
20 /* 1. The origin of this software must not be misrepresented; you must not */
21 /* claim that you wrote the original software. If you use this software */
22 /* in a product, an acknowledgment in the product documentation would be */
23 /* appreciated but is not required. */
24 /* 2. Altered source versions must be plainly marked as such, and must not */
25 /* be misrepresented as being the original software. */
26 /* 3. This notice may not be removed or altered from any source */
29 /*****************************************************************************/
38 /* Define a structure with the 6522 register offsets.
39 ** NOTE: The timer registers are not declared as 16 bit registers, because
40 ** the order in which the two 8 bit halves are written is important, and
41 ** the compiler doesn't guarantee any order when writing 16 bit values.
44 unsigned char prb; /* Port register B */
45 unsigned char pra; /* Port register A */
46 unsigned char ddrb; /* Data direction register B */
47 unsigned char ddra; /* Data direction register A */
48 unsigned char t1_lo; /* Timer 1, low byte */
49 unsigned char t1_hi; /* Timer 1, high byte */
50 unsigned char t1l_lo; /* Timer 1 latch, low byte */
51 unsigned char t1l_hi; /* Timer 1 latch, high byte */
52 unsigned char t2_lo; /* Timer 2, low byte */
53 unsigned char t2_hi; /* Timer 2, high byte */
54 unsigned char sr; /* Shift register */
55 unsigned char acr; /* Auxiliary control register */
56 unsigned char pcr; /* Peripheral control register */
57 unsigned char ifr; /* Interrupt flag register */
58 unsigned char ier; /* Interrupt enable register */
59 unsigned char pra2; /* Port register A w/o handshake */