GT1 Video

POWER Gt1 P/N 10G8658, FRU number 10G8659

J1 80-pin connector
J2 HDD15 video connector
JP1 Video mode select header
U1 Toshiba 10G8654
U2-9,11,12 VRAM
U10 Toshiba 10G8656
U14 IBM 51F1819
Y1 4.00000 MHz osc

Original image courtesy of Rick Ekblaw.


VRAM is Toshiba TC524258BZ-80 video RAM

Mono (2x in U11,U12 for 256KB) monochrome graphics only.
Greyscale (4x in U2-5 for 768KB) 16 gray shades or colors
Color (4x in U6-9 for 1280KB) 8-bit graphics (256 colors), max 1280x1024.


Video Connector Card  P/N 10G8624, FRU unknown

This card connects between the planar and the POWER Gt1 video adapter in the 7011-220. It has no components besides the unlabeled connectors.


GT1 and GT1B Video Card Settings

Note: The GT1B is the same as the GT1, but the GT1B has only two display jumpers (0 and 1) which limits the upper pixel frequency to 111 MHz. Display jumper 2 is permanently set to 1.

JP1 Jumpers

                                  Gt1/ Gt1B
______________________________________________________________________________
      DISPLAY     |  JMP  |  SCREEN     | Refresh   | Hor Freq | Pixel Freq
      TYPE        | 0 1 2 | RESOLUTION  | Freq (HZ) |   (KHz)  |   (MHz)
__________________|_______|_____________|___________|__________|______________
    8507 Mono     | 1 1 1 | 1024 x 768  |   43.5    |   35.5   |    44.9
    8508 Mono     | 1 1 1 | 1280 x 1024 |   67      |   70.8   |   128
    8514 Color    | 1 1 1 | 1024 x 768  |   43.5    |   35.5   |    44.9
    8515 Color    | 1 1 1 | 1024 x 768  |   43.5    |   35.5   |    44.9
    8517 Color    | 1 1 1 | 1024 x 768  |   69.96   |   57.0   |    78
                  | 0 1 1 | 1280 x 1024 |   51.48   |   56.5   |   103
__________________|_______|_____________|___________|__________|______________
    1091-51 Color | 1 1 1 | 1280 x 1024 |   72      |   75.8   |   128
    5081-16 Color | 1 1 1 | 1280 x 1024 |   60      |   63.4   |   111
    6091-16 Color | 1 1 1 | 1280 x 1024 |   60      |   63.4   |   111
                  | 0 1 1 | 1024 x 768  |   75.8    |   61.1   |    86
    6091-19 Color | 1 1 1 | 1280 x 1024 |   60      |   63.4   |   111
                  | 1 1 0 | 1280 x 1024 |   67      |   70.8   |   120
    6091-23 Color | 1 1 1 | 1280 x 1024 |   60      |   63.4   |   111
__________________|_______|_____________|___________|__________|______________
    Other Display | 1 0 1 | 1280 x 1024 |   60      |   63.34  |   108
                  | 0 0 1 | 1024 x 768  |   60      |   48.8   |    64
                  | 0 0 0 | 1024 x 768  |   70.4    |   56.8   |    75
__________________|_______|_____________|___________|__________|______________

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 20 Jan 2024 - Changelog | About | Legal & Contact