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root/cebix/Frodo4/Src/1541job.h
Revision: 1.4
Committed: 2005-06-27T19:55:48Z (17 years, 5 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

# Content
1 /*
2 * 1541job.h - Emulation of 1541 GCR disk reading/writing
3 *
4 * Frodo (C) 1994-1997,2002-2005 Christian Bauer
5 *
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