Western Digital VGA 8 ISA Card

The Western Digital VGA 8 is an 8-bit ISA expansion card that delivers video output for legacy systems requiring VGA graphics capability. Built around the Paradise PVGA1A-JK or WD90C00-JK chipset, this card provides 256KB of DRAM and supports resolutions up to 800 × 600 with up to 256 colors depending on resolution and configuration. It maintains backward compatibility with MDA, CGA, EGA, and Hercules standards while supporting 132-column text mode with fonts ranging from 6–9 pixels wide.

– Technical Specifications

• Chipset: Paradise PVGA1A-JK or WD90C00-JK
• Data Bus: 8-bit ISA
• Video Memory: 256KB DRAM
• Maximum Resolution: 800 × 600
• Color Depth: Up to 256 colors (resolution-dependent)
• Text Mode: 132-column supported
• Font Range: 6–9 pixels wide

– Key Features

• Single 15-pin DB15 analog video output connector for monitor integration
• 4-pin DIP switch configuration for display timing and monitor type selection
• Display timing switchable between PS/2-compatible and multi-frequency modes
• Monitor type selector for PS/2 style VGA or PC/AT style operation
• Graphics mode control via pins 1–2 closure for 800×600 enable or pins 2–3 closure for disable
• Feature connector (CN2) for extended functionality

– Typical Applications

Primary deployment in DOS and Windows 3.x environments where basic VGA output satisfies system requirements. Suitable for retrofitting 8-bit ISA systems that require monochrome or color display support without demanding high-resolution graphics.

– Compatibility & Integration

Fully backward compatible with MDA, CGA, EGA, Hercules, and AT&T 6300 video standards. Direct integration into any system with available 8-bit ISA slot; DIP switch configuration allows mode adaptation to specific hardware and monitor requirements.