CRT:IBM 8503
| Information | |
|---|---|
| Manufacturer | Tatung |
| Type | Business |
| Size | 12" |
| Regions | See text |
| 240p/480i | No |
| 480p | Yes |
| 720p | No |
| Vsync | 60/70 Hz |
| Widescreen | No |
| Component | 1x HD-15 (VGA, fixed cable) Y/H/V |
| Earliest Date | 1987 |
| Latest Date | > 1989-9 |
| Links | |
| Brochure | [1] |
The IBM 8503 Personal System/2 Monochrome Display is the original VGA (and 31 kHz VGA only) black and white monitor, along with its premium color equivalent - the 8513.
As to IBM tradition, the full model number (MT/M) is made of a 4-character family (8503) and a 3-character specification, here indicating input mains voltage (001 is North American spec, 002 European, ...)
It runs somewhat hot due to the large resistors used in the linear power supply; electrically, however, it's a cold chassis design using a full size isolation transformer (after the socket, switch, and fuse). The high voltage connector is made of somewhat hard clear plastic which tends to retract over the years, leaving a gap for dust to get into.
It pre-dates DPMS and EDID, and does not have any OSD except for a test pattern (white screen with uncontrolled height if pin 5 is not grounded). Unused pins are not present, making it compatible with sockets that have pin 9 filled. For best compatibility with sources that do not expect such a display, an EDID & channel mixer box is desirable.
Flyback: TFB-648E, secondary 18 kV
Controls
As factory configured, the image is significantly underscanned.
External
- Power, Brightness (with 50% stop), Contrast
Internal
- Centering, Geometry (magnetical)
- H/V Size
- Static and Dynamic focus
- Video gain (sub contrast), on neck board