Hercules Graphics Card

The Hercules Graphics Card, introduced in August 1982 by Hercules Computer Technology, was a monochrome video expansion card for the IBM PC that delivered 720×348 pixel resolution and became a de facto standard for high-resolution technical applications despite lacking BIOS support for its graphics modes.

At a time when IBM’s Monochrome Display Adapter (MDA) offered only text mode and the Color Graphics Adapter (CGA) provided low-resolution color, the Hercules Graphics Card carved a niche by combining MDA’s sharp 9 × 14 character text with high-resolution graphics, 720 pixels horizontally by 348 vertically⁸⁹¹¹. It was explicitly designed as a drop-in replacement for the MDA², maintaining full compatibility while adding two pages of graphics memory⁸⁹¹³. This allowed users to run existing MDA software while also accessing high-resolution graphics through custom drivers or application-level support.

The card’s success was not preordained. Unlike IBM’s offerings, it lacked built-in BIOS routines for graphics functions, a deliberate omission that became a significant stumbling block¹³. As a result, each program requiring graphics had to include its own driver or rely on third-party utilities loaded at boot¹¹. Yet this limitation did not prevent widespread adoption. By 1986, Hercules claimed sales of over 500,000 units⁶, later revising the figure to more than 775,000². The service manual notes that early versions could not disable the upper graphics page, creating memory conflicts when installed alongside color graphics cards¹³; later revisions addressed this by allowing page selection in mixed configurations.

Technical software developers embraced the platform. Lotus Development Corporation, in particular, endorsed the card for 1-2-3™, citing its performance advantages over available alternatives⁵. Other supported applications included AutoCAD⁴¹⁰, pfs! Graph⁴¹⁰, Symphony™⁸, and Microsoft Word⁵. Microsoft Windows also ran on the hardware², though performance depended on proper driver initialization. The company bundled free software with each card to enable high-resolution graphics programming in the PC’s built-in BASIC⁸⁹, lowering the barrier to entry for developers.

Pricing varied significantly across sources: one 1984 review lists the card at $490¹⁵, another at $369⁵, while a third claims users could acquire one for $150². A 1986 source reports a price of $199³, suggesting either regional variation, discounts, or model differentiation. All units came with a full two-year warranty⁴⁶¹⁰, an unusually long commitment for the era. The card also included a standard parallel printer port⁸⁹¹⁰, consolidating functionality on a single expansion board, a practical advantage in systems with limited slots.

Hercules positioned the card as engineered for reliability, emphasizing a reduced part count to minimize failure risk⁴. Exclusive safety features were said to protect connected monitors from damage⁴¹⁰, though the documentation does not specify their nature. The company later released the Hercules Graphics Card Plus as an enhanced successor², along with unrelated products such as the Hercules Color Card⁶⁷ and the Hercules Art Dept. suite, which included the Hercules Graphics Station Card¹.

Despite its monochrome output, the HGC’s image clarity was widely praised. One contemporary reviewer asserted that its display quality surpassed that of early EGA systems². Its resolution was double that of CGA², making it ideal for engineering, desktop publishing, and data visualization, domains where color was secondary to precision. The fact that numerous IBM-compatible video systems eventually offered Hercules-compatible modes¹³ highlights its influence. It remains one of only two video standards, along with IBM’s own, to achieve universal acceptance in the PC ecosystem²¹³.

Specifications

References

1. HerculesArtDept CommunicationArts MarApr90
2. profiles v6n2
3. BYTE Vol 11-10 1986-10 Apple II GS (1986)
4. 1986 04 BYTE 11-04 Number Crunching (1986)
5. 1984 08 BYTE 09-08 Modula-2 (1984)
6. 1986 06 BYTE 11-06 Computers and Music (1986)
7. 1985 07 BYTE 10-07 Computers and Space (1985)
8. BYTE Vol 10-01 1985-01 Through The Hourglass (1985)
9. 1984 12 BYTE 09-13 Communications (1984)
10. 1986 01 BYTE 11-01 Robotics (1986)
11. profiles v3n9
12. URP 8th edition
13. Sonera DisplayMateVideoDisplayUtilitiesReferenceV1 1990 (1990)
14. URP 4th edition
15. 1984 06 BYTE 09-06 Computers and Education (1984)