#define SAVE    TRUE                    /* similar truth */
#define RESTORE FALSE                   /* fibs */
#define PAINT   TRUE                    /* screen update modes */
#define FLASH   FALSE                   /* ditto */
#define REPLACE 1                       /* for flicker free */
#define ERASE   0                       /* scroll w_sapd & w_sapu */
#define FAST    0x01                    /* fast retrace */
#define SLOW    0x08                    /* slow retrace */

#define NULPTR  (char *) 0              /* null pointer */
#define BEL     0x07                    /* beep */
#define BS      0x08                    /* backspace */
#define NUL     '\0'                    /* NUL char */
#define ESC     0x1b                    /* Escape */
#define CR      0x0d                    /* carriage return */
#define LF      0x0a                    /* linefeed */
#define DEL     0x7f                    /* delete */
#define NAK     0x15                    /*  */
#define ETX     0x03                    /*  /
#define CAN     0x18                    /* X */
#define Del     0x53                    /* Del key scan code */
#define ECHO    0x8000                  /* echo disable bit */

#define BIOS    0x01                    /* BIOS Scrolling */
#define DMAS    0x02                    /* The BOSS's DMA Scrolling */