TSVGA - ColorBox ET4000 Graphics Adapter

- 640x480   16,256,32k,64k  60,72Hz
  640x480   16.7M  60Hz
  800x600   16,256  56,60,72Hz
  800x600   32k,64k  56,60Hz
  1024x768  16,256  60,72Hz & interlaced
  1280x1024 16  interlaced

 .---------------------------..--   .---------------. nnnnnn .-..--
 | #####U1        13::::::1  ||     | #####U1     13`-""""""-'1 ||
 | #8x #  .-----.            ||     | #8x #  .-----.  #RAMDAC#  ||
 | 256x4  |ET   |   #RAMDAC# ||     | 256x4  |ET   |            ||
 | DRAM#  |4000 |           .==.    | DRAM#  |4000 | #SYNC#    .==.
 | 80ns#  `-----' JP1: :JP3 |  |    | 80ns#  `-----'           |  |
 | #####                    `=='    | #####          #BIOS#    `=='
 | #####U8    #BIOS#  #SYNC# ||     | #####U8      JP1: :JP3    ||
 `--nnnnnnnn--nnnnnnnnnnnnn--'|     `--nnnnnnnn--nnnnnnnnnnnnn--'|
    """"""""  """""""""""""   |        """"""""  """""""""""""   |

- RAMDAC's used:
  SIERRA SC11483  max 32k colors,
  SIERRA SC11487, AT&T ATT20C492, MUSIC 4780  max 64k colors,
  AT&T ATT20C491  max 16.7M colors.

- Jumpers:
  JP1: IRQ2 Control line.  1-2 IRQ2 enabled, 2-3 IRQ2 disabled.
  JP3: Turbo Mode.  1-2 Turbo enabled, 2-3 Turbo disabled.

- Memory: 256Kx4 FastPage mode DRAM 80ns.
  256kB (U4,8): 320x200x256, 640x250x16, 640x480x16, 800x600x16.
  512kB (U3,4,7,8):  640x480x256, 800x600x256, 1024x768x16.
  1MB (U1..8): 640x480x16.7M, 800x600x64k, 1024x768x256, 1280x1024x16.

- Monitor Connector: (15pin mini-dsub)
  1-Red, 2-Green, 3-Blue, 4-ID2, 5-GND, 6-RGND, 7-GGND, 8-BGND,
  9-key(no connection), 10-SyncGND, 11-ID0, 12-ID1, 13-HSync,
  14-Vsync, 15-ID3.


/ Tomas Andersson 1995-06-10