B5500/sim_card.h

/* Card read/punch routines for 7000 simulators.

   Copyright (c) 2005, Richard Cornwell

   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

   This is the standard card reader.
   This is the standard card punch.

   Input formats are accepted in a variaty of formats:
        Standard ASCII: one record per line.
                returns are ignored.
                tabs are expanded to modules 8 characters.
                ~ in first column is treated as a EOF.

        Binary Card format:
                Each record 160 characters.
                First character   21012345
                                  111 
                Second characters 6789----
                Top 4 bits of second character are 0.
                It is unlikely that ascii text or BCD format
                text could produce similar profile.

        BCD Format:
                Each record variable length (80 chars or less).
                Record mark has bit 7 set.
                Bit 6 is even parity.
                Bits 5-0 are character.

        CBN Format:
                Each record 160 charaters.
                First char has bit 7 set. Rest set to 0.
                Bit 6 is odd parity.
                Bit 5-0 of first character are top 6 bits
                        of card.
                Bit 5-0 of second character are lower 6 bits
                        of card.

    For autodetection of BCD card format, there can be no parity errors.
    All undeterminate formats are treated as ASCII.

    Auto output format is ASCII if card has only printable characters
    or card format binary.
*/


#define DEBUG_CARD      0x0000010       /* Show details */

/* Flags for punch and reader. */
#define UNIT_V_MODE     (UNIT_V_UF + 0)
#define UNIT_MODE       (7 << UNIT_V_MODE)
#define MODE_AUTO       (0 << UNIT_V_MODE)
#define MODE_BIN        (1 << UNIT_V_MODE)
#define MODE_TEXT       (2 << UNIT_V_MODE)
#define MODE_BCD        (3 << UNIT_V_MODE)
#define MODE_CBN        (4 << UNIT_V_MODE)
/* Allow lower case letters */
#define MODE_LOWER      (8 << UNIT_V_MODE)
#define MODE_026        (0x10 << UNIT_V_MODE)
#define MODE_029        (0x20 << UNIT_V_MODE)
#define MODE_EBCDIC     (0x30 << UNIT_V_MODE)
#define MODE_CHAR       (0x30 << UNIT_V_MODE)


struct _card_data
{
    int                 ptr;            /* Pointer in buffer */
    int                 len;            /* Length of buffer */
    char                cbuff[1024];    /* Read in buffer for cards */
    uint16              image[80];      /* Image */
    uint8               hol_to_ascii[4096]; /* Back conversion table */
};

/* Generic routines. */
t_stat   sim_read_card(UNIT * uptr);
int      sim_card_eof(UNIT * uptr);
t_stat   sim_punch_card(UNIT * uptr, UNIT *stkptr);
t_stat   sim_card_attach(UNIT * uptr, char *file);
t_stat   sim_card_detach(UNIT *uptr);

/* Conversion routines to save code */
uint16   sim_bcd_to_hol(uint8 bcd);
uint16   sim_ebcdic_to_hol(uint8 ebcdic);
uint8    sim_hol_to_bcd(uint16 hol);
uint8    sim_hol_to_ebbcd(uint16 hol);

/* Format control routines. */
t_stat sim_card_set_fmt (UNIT *uptr, int32 val, char *cptr, void *desc);
t_stat sim_card_show_fmt (FILE *st, UNIT *uptr, int32 val, void *desc);

/* Help information */
t_stat sim_card_attach_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr);

/* Translation tables */
const char      sim_six_to_ascii[64];
const char      sim_ascii_to_six[128];
const uint8     sim_parity_table[64];