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root/cebix/Frodo4/Src/1541job.h
Revision: 1.4
Committed: 2005-06-27T19:55:48Z (18 years, 9 months ago) by cebix
Content type: text/plain
Branch: MAIN
CVS Tags: VERSION_4_2, HEAD
Changes since 1.3: +1 -1 lines
Log Message:
updated copyright dates

File Contents

# User Rev Content
1 cebix 1.1 /*
2     * 1541job.h - Emulation of 1541 GCR disk reading/writing
3     *
4 cebix 1.4 * Frodo (C) 1994-1997,2002-2005 Christian Bauer
5 cebix 1.1 *
6     * This program is free software; you can redistribute it and/or modify
7     * it under the terms of the GNU General Public License as published by
8     * the Free Software Foundation; either version 2 of the License, or
9     * (at your option) any later version.
10     *
11     * This program is distributed in the hope that it will be useful,
12     * but WITHOUT ANY WARRANTY; without even the implied warranty of
13     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14     * GNU General Public License for more details.
15     *
16     * You should have received a copy of the GNU General Public License
17     * along with this program; if not, write to the Free Software
18     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19     */
20    
21     #ifndef _1541JOB_H
22     #define _1541JOB_H
23    
24    
25     class MOS6502_1541;
26     class Prefs;
27     struct Job1541State;
28    
29     class Job1541 {
30     public:
31     Job1541(uint8 *ram1541);
32     ~Job1541();
33    
34     void GetState(Job1541State *state);
35     void SetState(Job1541State *state);
36     void NewPrefs(Prefs *prefs);
37     void MoveHeadOut(void);
38     void MoveHeadIn(void);
39     bool SyncFound(void);
40     uint8 ReadGCRByte(void);
41     uint8 WPState(void);
42     void WriteSector(void);
43     void FormatTrack(void);
44    
45     private:
46     void open_d64_file(char *filepath);
47     void close_d64_file(void);
48     bool read_sector(int track, int sector, uint8 *buffer);
49     bool write_sector(int track, int sector, uint8 *buffer);
50     void format_disk(void);
51     int secnum_from_ts(int track, int sector);
52     int offset_from_ts(int track, int sector);
53     void gcr_conv4(uint8 *from, uint8 *to);
54     void sector2gcr(int track, int sector);
55     void disk2gcr(void);
56    
57     uint8 *ram; // Pointer to 1541 RAM
58     FILE *the_file; // File pointer for .d64 file
59     int image_header; // Length of .d64/.x64 file header
60    
61     uint8 id1, id2; // ID of disk
62     uint8 error_info[683]; // Sector error information (1 byte/sector)
63    
64     uint8 *gcr_data; // Pointer to GCR encoded disk data
65     uint8 *gcr_ptr; // Pointer to GCR data under R/W head
66     uint8 *gcr_track_start; // Pointer to start of GCR data of current track
67     uint8 *gcr_track_end; // Pointer to end of GCR data of current track
68     int current_halftrack; // Current halftrack number (2..70)
69    
70     bool write_protected; // Flag: Disk write-protected
71     bool disk_changed; // Flag: Disk changed (WP sensor strobe control)
72     };
73    
74     // 1541 GCR state
75     struct Job1541State {
76     int current_halftrack;
77     uint32 gcr_ptr;
78     bool write_protected;
79     bool disk_changed;
80     };
81    
82    
83     /*
84     * Check if R/W head is over SYNC
85     */
86    
87     inline bool Job1541::SyncFound(void)
88     {
89     if (*gcr_ptr == 0xff)
90     return true;
91     else {
92     gcr_ptr++; // Rotate disk
93     if (gcr_ptr == gcr_track_end)
94     gcr_ptr = gcr_track_start;
95     return false;
96     }
97     }
98    
99    
100     /*
101     * Read one GCR byte from disk
102     */
103    
104     inline uint8 Job1541::ReadGCRByte(void)
105     {
106     uint8 byte = *gcr_ptr++; // Rotate disk
107     if (gcr_ptr == gcr_track_end)
108     gcr_ptr = gcr_track_start;
109     return byte;
110     }
111    
112    
113     /*
114     * Return state of write protect sensor
115     */
116    
117     inline uint8 Job1541::WPState(void)
118     {
119     if (disk_changed) { // Disk change -> WP sensor strobe
120     disk_changed = false;
121     return write_protected ? 0x10 : 0;
122     } else
123     return write_protected ? 0 : 0x10;
124     }
125    
126     #endif