1.2 System Overview (continued)

• Video -- Commodore CSG 4567 enhanced VIC chip
  • RGBA with sync on all colors or digital sync
  • Composite NTSC or PAL video, separate chroma/luma
  • Composite NTSC or PAL digital monochrome
  • RF TV output via NTSC or PAL modulator
  • Digital foreground/background control (genlock).
  • All original C64 video modes:
    • 40x25 standard character mode
    • Extended background color mode
    • 320x200 bitmap mode
    • Multi-color mode
    • 16 colors
    • 8 sprites, 24x21
  • 40 and 80 character columns by 25 rows:
    • Color, blink, bold, inverse video, underline attributes
  • True bitplane graphics:

    320	x	200	x	256	(8-bitplane)	non-interlaced
    640	x	200	x	16*	(4-bitplane)	non-interlaced
    1280	x	200	x	4*	(2-bitplane)	non-interlaced
    320	x	400	x	256	(8-bitplane)	interlaced
    640	x	400	x	16*	(4-bitplane)	interlaced
    1280	x	400	x	4*	(2-bitplane)	interlaced
    *plus sprite and border colors

  • Color palettes:
    • Standard 16-color C64 ROM palette
    • Programmable 256-color RAM palette, with 16 intensity levels per primary color (yeilding 4096 colors)
  • Horizontal and vertical screen positioning verniers
  • Display Address Translator (DAT) allows programmer to access bitplanes easily and directly.
  • Access to optional expansion RAM
  • Operates at either clock speed without blanking
• Audio -- Commodore CSG8580 SID chips
  • Stereo SID chips:
    • Total of 6 voices, 3 per channel
    • Programmable ADSR envelope for each voice
    • Filter, modulation, audio inputs, potentiometer
    • Separate left/right volume, filter, modulation control