Overview
The item is clearly identified by the printed text on the bottom right of each page, which reads 'DISK JOCKEY 2D REVISION 3' and 'COPYRIGHT 1979 GEORGE MORROW'. The five pages of schematics match the seller's description perfectly.
Identification
1979 George Morrow Disk Jockey 2D Revision 3 Schematic Document Set
Photo reference
5 uploaded photos
Story
George Morrow was a prominent pioneer in the early microcomputer industry, known for his S-100 bus designs and CP/M systems under Morrow Designs. The Disk Jockey 2D was a popular floppy disk controller in the late 1970s. Original documentation from this era is increasingly scarce but remains a niche collectible. The market for vintage S-100 bus computer documentation is driven by a niche group of retrocomputing enthusiasts and hardware restorers.
Maker / Origin
George Morrow
Condition & Value
Based on typical vintage paper ephemera, value is highly dependent on legibility. Minor edge wear or age-toning is expected and acceptable, provided the gate-level logic diagrams remain fully readable for repair use. Any fading or tearing that obscures the circuit paths would severely impact utility.
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Sold comps, value drivers, and venue guidance pulled from recent auction results.
Market Analysis
The market for vintage S-100 bus computer documentation is driven by a niche group of retrocomputing enthusiasts and hardware restorers. While full, bound manuals command $40-$60, loose schematics and short technical sheets typically trade in the $15-$30 range. Demand is highly specific; items sell when a restorer needs the exact schematic to repair a corresponding vintage board.
Value Drivers
▲ Direct association with George Morrow, a notable early microcomputer pioneer.
▲ Complete 5-page set ensures all necessary gate-level logic is present for board restorers.
▲ S-100 bus documentation retains steady demand among vintage computing enthusiasts.
Concerns
▼ Unbound, short schematic sets command less than full, bound user manuals.
▼ Highly specific demand means the item may sit until a buyer repairing this exact board appears.
▼ Unverified legibility — any fading that obscures the circuit diagrams would severely impact utility and value.
Best Venue
List as a fixed-price Buy-It-Now on eBay or a dedicated retrocomputing forum, targeting hardware restorers. Price at $35 with offers accepted to capture buyers needing this specific schematic, or bundle with other S-100 ephemera if a faster sale is desired.
Upside Potential
If the schematics include handwritten engineering notes or corrections from the era, or if two restorers are currently competing to fix a Disk Jockey 2D board, the price could push toward the $50 mark typical of full manuals.