Module pcbios.inc - PC platform BIOS and related constants

Index

• Group BIOS.CFG - Offsets in the BIOS configuration area
  
  • Constant BIOS.CFG.BIOSCTL - PS/2 bios control flags (8-bit)
  • Constant BIOS.CFG.COM1 - First serial port (16-bit)
  • Constant BIOS.CFG.COM2 - Second serial port (16-bit)
  • Constant BIOS.CFG.COM3 - Third serial port (16-bit)
  • Constant BIOS.CFG.COM4 - Fourth serial port (16-bit)
  • Constant BIOS.CFG.DISKPORTOFF - Port offset to current fixed disk adapter (8-bit)
  • Constant BIOS.CFG.DRECAL - Drive recalibration status (8-bit)
  • Constant BIOS.CFG.EBDA - Extended BIOS data area for EISA and MCA systems (16-bit)
  • Constant BIOS.CFG.EQUIP - Equipment list flags (16-bit)
  • Constant BIOS.CFG.IRKYBERR - PCjr: number of infrared keyboard link errors (8-bit)
  • Constant BIOS.CFG.LPT1 - First parallel port (16-bit)
  • Constant BIOS.CFG.LPT2 - Second parallel port (16-bit)
  • Constant BIOS.CFG.LPT3 - Third parallel port (16-bit)
  • Constant BIOS.CFG.LPT4 - Fourth parallel port (16-bit)
  • Constant BIOS.CFG.MEMSIZE - Machine base memory size (in KiB -1) (16-bit)
  • Constant BIOS.CFG.MSTATE - Drive 0-4 media state (4 * 8-bit)
  • Constant BIOS.CFG.NDISKS - Number of hard-disks attached (8-bit)
• Constant BIOS.CFG.MEMBASE - BIOS configuration area address
• Group BIOS.EQUIP - BIOS equipment list flags bits (BIOS.CFG.EQUIP)
  
  • Constant BIOS.EQUIP.GAME - Game adapter installed
  • Constant BIOS.EQUIP.INTMODEM - Internal modem
  • Constant BIOS.EQUIP.IPL - IPL disk installed
  • Constant BIOS.EQUIP.MATH - Math co-processor installed
  • Constant BIOS.EQUIP.NDISK.MASK - Number of disk-drives minus 1 (if .IPL = 1)
  • Constant BIOS.EQUIP.NDISK.SHIFT - Shift to get number of disk drives
  • Constant BIOS.EQUIP.NODMA - 0 if DMA installed
  • Constant BIOS.EQUIP.NPRINT.MASK - Number of printer ports installed
  • Constant BIOS.EQUIP.NPRINT.SHIFT - Shift to get number of printer ports
  • Constant BIOS.EQUIP.NSERIAL.MASK - Number of serial ports (0-7)
  • Constant BIOS.EQUIP.NSERIAL.SHIFT - Shift to get number of serial ports
  • Constant BIOS.EQUIP.POINTER - Pointing device installed
  • Constant BIOS.EQUIP.VMODE.4025C - 40x25 colour
  • Constant BIOS.EQUIP.VMODE.8025C - 80x25 colour
  • Constant BIOS.EQUIP.VMODE.8025M - 80x25 monochrome
  • Constant BIOS.EQUIP.VMODE.MASK - Video mode mask
  • Constant BIOS.EQUIP.VMODE.NONE - Unused/invalid
• Group BIOS.MSTATE - BIOS disk media state bits (BIOS.CFG.MSTATE)
  
  • Constant BIOS.MSTATE.MEDIA.MASK - Media state media mask
  • Constant BIOS.MSTATE.MEDIA.NO1212 - No 1.2M disk in 1.2M drive
  • Constant BIOS.MSTATE.MEDIA.NO36012 - No 360k disk in 1.2M drive
  • Constant BIOS.MSTATE.MEDIA.NO360360 - No 360k disk in 360k drive
  • Constant BIOS.MSTATE.MEDIA.OTHER - None of the above
  • Constant BIOS.MSTATE.MEDIA.YES1212 - Yes 1.2M disk in 1.2M drive
  • Constant BIOS.MSTATE.MEDIA.YES36012 - Yes 360k disk in 1.2M drive
  • Constant BIOS.MSTATE.MEDIA.YES360360 - Yes 360k disk in 360k drive
• Constant BIOS.VGA.CONTROL.BUF - VGA control port start
• Constant BIOS.VGA.CONTROL.BUF.LEN - VGA control port length (number of ports)
• Constant VGA.GRAPHICS.MEM - VGA graphics framebuffer address
• Constant VGA.GRAPHICS.MEM.LEN - VGA graphics framebuffer length;
• Constant VGA.TEXT.FRAMEBUF - VGA text framebuffer address
• Constant VGA.TEXT.FRAMEBUF.LEN - VGA text framebuffer length

Declarations