WD90C11 / WD90C11A
An "Enhanced VGA controller" from Western Digital, the WD90C11-LR chipset used a 1.25 micron process. The WD90C11A used the later 0.9 micron process for manufacture.
|
Released | 1989 |
| Bus | ISA 16-bit | |
| Chipset | Western Digital WD90C11 / WD90C11A | |
| Standards | MDA, Hercules, CGA, EGA, VGA | |
| Memory | 256 KB or 512 KB (FPM DRAMs) | |
| Ports | 15-pin DSUB (RGB analogue out) | |
| RAMDAC | Music Semiconductor TR9C1710 or Samsung KDA0476PL, 45 MHz | |
| FCC ID | DBMC03453, DX9ILXP6676P | |
| Price | ||
| See Also |
An "Enhanced VGA controller" from Western Digital - the WD90C11-LR chipset. The WD90C11 used a 1.25 micron process, and WD90C11A used the later 0.9 micron process for manufacture. Highlights of the chipset include:
- On 512 KB video RAM boards, resolutions up to 1024 x 768 in 16 colours interlaced or non-interlaced (plus 640 x 400, 640 x 480, 800 x 600, all in 256 colours)
- On 256 KB video RAM boards, resolutions up to 1024 x 768 in 2/4 colours, or 800 x 600 in 16 colours
- 132-column text mode and 6-9 pixels wide fonts
- Integrated CRT controller, sequencer, graphics controller and attribute controller
- Write cache for improved CPU write performance
- 8- or 16-bit data bus for I/O and memory. True 16-bit CPU-to-video memory transfer for all modes
- Up to 65 MHz maximum video clock rate
- Up to 42 MHz maximum memory clock rate (90C11) or 45 MHz (90C11A)
- Supports all VGA modes if using two 64Kx16 DRAMs
- Full VGA hardware and BIOS compatibility
- EGA register-level compatibility on analog, TTL, and multi-frequency monitors
- Backward compatibility with MDA, CGA, EGA, Hercules and AT&T 6300
- Flexible RAM options, including two 256Kx4 DRAMs (256 KB of video RAM), or four 256Kx4 DRAMs (512 KB of video RAM)
Click here for the WD90C11 datasheet.
The WD90C11 and WD90C11A can be found on the following cards:
- Octek PVGA1C
- Phillips PW800 VGA (FCC ID: DBM003453)
- Unknown card (FCC ID: IB9MVGA P16CS)
- Lung Hwa Electronics XP6676P (FCC ID: DXL9ILXP6676P)
- HITA (Higher Intellect Technology) MVGA-P1C
Board Revisions
Competition
In the Media
Setting it Up
The five DIP switches normally found on WD90C11-based cards have these meanings:
| DIP Switch | Settings |
|---|---|
| 1 | Monitor Type: ON = Multi-Sync One timing (only) OFF = PS/2 and other Multi-Sync monitor timings |
| 2 | BIOS Function: (unsure what this does - perhaps changes the memory location of the VGA BIOS extensions or is related to ISA vs MCA architecture) ON = PS/2 VGA mode OFF = AT VGA mode |
| 3 and 4 | 800 x 600 Mode: ON ON = 800 x 600, 56 Hz refresh rate, 35.4 KHz horiz. sync (16 and 256 colours) ON OFF = 800 x 600, 60 Hz refresh rate, 37.8 KHz horiz. sync (16 and 256 colours) OFF ON = 800 x 600, 72 Hz refresh rate, 48.2 KHz horiz. sync (16 colours) *or* 800 x 600, 56 Hz refresh rate, 35.4 KHz horiz. sync (256 colours) OFF OFF = 800 x 600, 72 Hz refresh rate, 47.5 KHz horiz. sync (16 colours) *or* 800 x 600, 60 Hz refresh rate, 38.0 KHz horiz. sync (256 colours) |
| 5 | 1024 x 768 Mode: ON = Interlaced OFF = Non-interlaced |
Downloads
Operation Manual Get in touch if you can provide this missing item! |
Original Utility Disk Get in touch if you can provide this missing item! |
|
