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Table of Contents
VC-3 System Interrupt Table
The VC-3 is a system, running on the SD-8516.
Introduction
I guess this interrupt system is part of the KERNAL, so should be more “VC-3” as it is system software. What follows is a simple list of the interrupt, what it does, it's calling parameters and it's return codes. I guess this should be called “Stellar BIOS V1”.
INT 10h - Video Services
;
; INT 10h - VIDEO SERVICES ; Stellar BIOS Video interrupt handler ;
; Function dispatch via AH register: ; AH=00h: Set video mode ; AH=01h: Set cursor shape (reserved) ; AH=02h: Set cursor position ; AH=03h: Get cursor position ; AH=0Eh: Write character at cursor (teletype) ; AH=0Fh: Get current video mode ; AH=13h: Write string at cursor ; AH=14h: Scroll screen up ; AH=15h: Clear screen ; AH=16h: Get video parameters (rows, cols) ;
AH=00h: Set video mode
- Returns: AL is 00 on success, 01 if the mode failed to init.
Available modes:
- Mode 0: 22×23 console
- Mode 1: 40×25 console
- Mode 2: 80×25 console
- Mode 3: still thinking, graphics, or superterminal? 1280×800 “128×40“font via 10×20 charset??