Amiga Hardware DatabaseManufacturer Keybonus Ltd. / Amiga Centre Scotland, UK | Date 1993 | Amiga A2000, A3000, A4000 | Interface Zorro II | Autoconfig ID 2118 / |
- framebuffer
- designed to produce RGB component video with CCIR compliant blanking and synchronisation (doing the half lines, serrations and equalizing pulses)
- built in genlock - its output can be synchronised with a black burst studio reference, but does not do keying or mixing
- filterd output signal, so it is quiet and properly band-limited
- screen modes:
- vertical resolution is fixed by CCIR compliance to 576 lines for the PAL variant, 486 for the NTSC variant
- horizontal resolution can be selected from 910, 832, 768 (square pixel) or 720 for PAL, or 910, 832, 640 (square pixel) or 720 for NTSC
- 15 kHz interlaced (CCIR compliant) or 31 kHz non-interlaced (VGA timings)
- as well as normal 24 bit colour the board supports 24 bit palette mapped colour
- supports 15 bit graphics
- supports 8 bit direct or 8 bit palette mapped (from 24 bit palette) graphics
- uses the Brooktree Bt473 RAMDAC same as the OpalVision
- the framebuffer allows for storing a 24 bit image or 3× 8 bit palette mapped images
- with the double buffering option it allows for 2× 24 bit, 2× 15 bit or 6× 8 bit images stored simultaneously
- the buffer switching is synchronized to vertical blanking and can be switched every frame if necessary
- the 8 bit alpha channel can be output as an analog signal for linear keying or anti-aliasing
- it can also be reassigned to provide a 15 colour palette mapped overlay screen in addition to the main screen
- the board can be configured to produce interrupts on the first and/or second field of the interlace
- memory:
- H2000 Plus: 2 MB VRAM
- H4000 Plus: 4 MB VRAM and double buffering
- the VRAM is linearly mapped into the Zorro II address space
- backwards compatible with the Harlequin
- optionally bundled with MacroSystem's V-Lab Y/C real-time digitizer