November 2025

52 Year Old Data Tape Could Contain Unix History • The Register

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Tape containing the original Unix Fourth Edition, believed to be from the 1970s, discovered at the University of Utah. If recoverable, it may provide vital historical data, including the first Unix version written in C. The tape will be delivered to the Computer History Museum for analysis.

https://www.theregister.com/2025/11/07/unix_fourth_edition_tape_rediscovered/

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The Microsoft SoftCard for the Apple II: Getting Two Processors to Share the Same Memory

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Microsoft’s Z-80 SoftCard allowed Apple II users to run CP/M software by utilizing a secondary Zilog Z80 processor, facilitating memory sharing and enabling coexistence with the existing 6502 processor. The SoftCard remapped memory to avoid conflicts and included a detailed manual for programming, including challenges of managing interrupts and memory addresses.

https://devblogs.microsoft.com/oldnewthing/20251104-00/?p=111758

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Mr TIFF

Author John Buck chronicles his quest to credit inventors behind technology, notably Stephen Carlsen, creator of TIFF. Despite initial anonymity, Buck’s persistence led him to Carlsen, who shaped the standard while at Aldus. Tragically, Carlsen passed away before full recognition could be achieved. Buck updated TIFF’s Wikipedia entry, giving Carlsen the acknowledgment he deserves: “created by Stephen Carlsen, an engineer at Aldus.”

https://inventingthefuture.ghost.io/mr-tiff/

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Floppy Disk / Diskettes // Retrocmp / Retro Computing

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Overview of diskettes includes types (8″, 5.25″, 3.5″, 3″), sectoring distinctions (hard/soft), and write protection features. Also covers index holes, examples from various systems, product lists from 3M and boeder, and links to documents, manuals, and external sources about floppy disk technology.

https://retrocmp.de/fdd/diskette/diskette.htm

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