BIOS Functions

BIOS Function Summary

• BIOS Function Summary

Details on BIOS Functions

• BIOS Kernel Functions
• BIOS Kernel RSX Functions (Resident System Extensions)
• BIOS Kernel Timer/Event Functions
• BIOS Machine Pack
• BIOS Keyboard Functions
• BIOS Text Functions
• BIOS Graphics Functions
• BIOS Screen Functions
• BIOS Cassette (or Diskette) Functions
• BIOS Sound Functions
• AMSDOS RSX Functions
• AMSDOS Hidden RSX Functions

BIOS Reserved CPU Registers

 AF'   Reserved for Interrupts (A=old C', CY=External IRQ Flag)
 BC'   Reserved for Gate Array (BC=7F8xh, LSBs=ROM enable/video mode)
 DE'   Reserved for BIOS
 HL'   Reserved for BIOS

BIOS Memory Maps

• BIOS Overall Memory Map
• AMSDOS Memory Map

Other Information

• The Amstrad CPC Firmware Guide - original txt version
• The Amstrad CPC Firmware Guide - decadent pdf version
• Soft968: CPC 464/664/6128 Firmware - official firmware specs