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/* |
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* IEC.h - IEC bus routines, 1541 emulation (DOS level) |
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* |
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* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
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* |
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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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* |
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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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* |
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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, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#ifndef _IEC_H |
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#define _IEC_H |
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|
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|
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// Maximum length of file names |
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const int NAMEBUF_LENGTH = 256; |
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|
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|
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// C64 status codes |
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enum { |
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ST_OK = 0, // No error |
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ST_READ_TIMEOUT = 0x02, // Timeout on reading |
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ST_TIMEOUT = 0x03, // Timeout |
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ST_EOF = 0x40, // End of file |
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ST_NOTPRESENT = 0x80 // Device not present |
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}; |
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|
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|
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// 1541 error codes |
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enum { |
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ERR_OK, // 00 OK |
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ERR_WRITEERROR, // 25 WRITE ERROR |
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ERR_WRITEPROTECT, // 26 WRITE PROTECT ON |
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ERR_SYNTAX30, // 30 SYNTAX ERROR (unknown command) |
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ERR_SYNTAX33, // 33 SYNTAX ERROR (wildcards on writing) |
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ERR_WRITEFILEOPEN, // 60 WRITE FILE OPEN |
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ERR_FILENOTOPEN, // 61 FILE NOT OPEN |
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ERR_FILENOTFOUND, // 62 FILE NOT FOUND |
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ERR_ILLEGALTS, // 67 ILLEGAL TRACK OR SECTOR |
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ERR_NOCHANNEL, // 70 NO CHANNEL |
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ERR_STARTUP, // 73 Power-up message |
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ERR_NOTREADY // 74 DRIVE NOT READY |
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}; |
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|
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|
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// IEC command codes |
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enum { |
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CMD_DATA = 0x60, // Data transfer |
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CMD_CLOSE = 0xe0, // Close channel |
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CMD_OPEN = 0xf0 // Open channel |
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}; |
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|
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|
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// IEC ATN codes |
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enum { |
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ATN_LISTEN = 0x20, |
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ATN_UNLISTEN = 0x30, |
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ATN_TALK = 0x40, |
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ATN_UNTALK = 0x50 |
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}; |
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|
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|
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// Drive LED states |
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enum { |
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DRVLED_OFF, // Inactive, LED off |
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DRVLED_ON, // Active, LED on |
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DRVLED_ERROR // Error, blink LED |
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}; |
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|
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|
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class Drive; |
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class C64Display; |
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class Prefs; |
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|
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// Class for complete IEC bus system with drives 8..11 |
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class IEC { |
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public: |
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IEC(C64Display *display); |
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~IEC(); |
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|
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void Reset(void); |
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void NewPrefs(Prefs *prefs); |
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void UpdateLEDs(void); |
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|
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uint8 Out(uint8 byte, bool eoi); |
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uint8 OutATN(uint8 byte); |
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uint8 OutSec(uint8 byte); |
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uint8 In(uint8 *byte); |
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void SetATN(void); |
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void RelATN(void); |
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void Turnaround(void); |
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void Release(void); |
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|
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private: |
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uint8 listen(int device); |
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uint8 talk(int device); |
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uint8 unlisten(void); |
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uint8 untalk(void); |
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uint8 sec_listen(void); |
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uint8 sec_talk(void); |
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uint8 open_out(uint8 byte, bool eoi); |
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uint8 data_out(uint8 byte, bool eoi); |
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uint8 data_in(uint8 *byte); |
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|
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C64Display *the_display; // Pointer to display object (for drive LEDs) |
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|
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char name_buf[NAMEBUF_LENGTH]; // Buffer for file names and command strings |
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char *name_ptr; // Pointer for reception of file name |
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int name_len; // Received length of file name |
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|
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Drive *drive[4]; // 4 drives (8..11) |
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|
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Drive *listener; // Pointer to active listener |
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Drive *talker; // Pointer to active talker |
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|
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bool listener_active; // Listener selected, listener_data is valid |
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bool talker_active; // Talker selected, talker_data is valid |
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bool listening; // Last ATN was listen (to decide between sec_listen/sec_talk) |
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|
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uint8 received_cmd; // Received command code ($x0) |
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uint8 sec_addr; // Received secondary address ($0x) |
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}; |
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|
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|
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// Abstract superclass for individual drives |
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class Drive { |
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public: |
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Drive(IEC *iec); |
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virtual ~Drive() {} |
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|
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virtual uint8 Open(int channel, char *filename)=0; |
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virtual uint8 Close(int channel)=0; |
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virtual uint8 Read(int channel, uint8 *byte)=0; |
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virtual uint8 Write(int channel, uint8 byte, bool eoi)=0; |
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virtual void Reset(void)=0; |
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|
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int LED; // Drive LED state |
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bool Ready; // Drive is ready for operation |
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|
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protected: |
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void set_error(int error); |
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|
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char *error_ptr; // Pointer within error message |
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int error_len; // Remaining length of error message |
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|
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private: |
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IEC *the_iec; // Pointer to IEC object |
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}; |
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|
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#endif |
