Indivision AGA 1200 / Indivision AGA 4000
Company
Individual Computers, Germany
Date
2008/2009
Amiga
A1200, A4000, CD32
Interface
Lisa chip
    flicker-fixer
  • with a maximum input pixel clock of 28 MHz, all Amiga video modes up to Super Hires are supported and flicker-fixed (with the exception of the A2024 mode)
  • picture refresh rate of at least 60 Hz for all screen modes, resulting in a maximum output pixel clock of 71 MHz
  • 24 bit color support (16.7 million colors)
  • supports interlaced and progressive scan input modes
  • output modes are always progressive scan
  • two output modes can be chosen:
    • Async mode: output pixel clock of Amiga modes are multiplied 2.5 times
    • Vertical Sync mode: exact double of Amiga mode pixel clock (eliminates tearing effects)
  • clips only onto the Lisa chip on motherboard, no soldering required
    • gets power and all signals from this chip
    • sync signals are derived from the inter-chip communication of the AGA chipset
  • HD15 VGA connector
  • supports border blanking
  • 16 megabyte SDRAM
    • SDRAM is single-ported, thus reading and writing is decoupled by two FIFO buffers and a dual-port SDRAM controller running at 111 MHz
    • only 12 MB are used, 4 MB stay free
  • memory layout of 2048x2048 pixels (= maximum resolution)
  • compatible to Genlocks
  • no passthrough mode (all resolutions are flicker-fixed)
  • FPGA based design with FlashROM
  • Emergency Mode (emergency disk needed) in case a FlashROM update went wrong
  • low heat dissipation due to 2.5V/3.3V design (only the voltage regulator is 5V)
  • boot screen, shown for a pre-defined time - in case important information is displayed (e.g. Guru / Error Screen, Early Startup Menu), this time is reduced
  • no driver needed, however additional screenmodes are supported:
    • HighGFX (1024×786)
    • HD720 (1280×720)
    Indivision AGA 1200
  • cutouts in the board allow installation of other internal A1200 components like IDE-Fix Express and the Lyra 1200 keyboard adaptor - tight design, so boards may touch on certain A1200 board revisions
  • first revision boards were prone to snapping from the Lisa socket, so later revisions had the socket on the Indivision board machine finished
    Indivision AGA 4000
  • this is a follow-up design to the Indivision AGA 1200, offering the same features while having a different board layout to fit in A4000D and CD32
  • 10nF capacitors have been added to the PLLs
  • two (instead of one) TTL drivers for the VGA Sync wires
  • prototype board is white, the final version has a blue PCB
Photos
Individual Computers Indivision AGA 1200 / Indivision AGA 4000 - Indivision AGA 4000 Prototype Board front side
Indivision AGA 4000 Prototype Board, front side
Individual Computers Indivision AGA 1200 / Indivision AGA 4000 - Indivision AGA 1200 front side
Indivision AGA 1200, front side
Individual Computers Indivision AGA 1200 / Indivision AGA 4000 - Indivision AGA 1200 back side
Indivision AGA 1200, back side
Individual Computers Indivision AGA 1200 / Indivision AGA 4000 - Indivision AGA 4000 Prototype Board back side
Indivision AGA 4000 Prototype Board, back side