D. P. Johnson

D. P. Johnson (Dan Johnson) created a number of very useful software packages, as well as some hardware products.

Software products:

• SDisk: improved floppy disk driver for OS-9 Level I on the CoCo 2:
  (ad, user manual, disk image, source code)
• Bootfix: allows booting OS-9 from CoCo double-sided disk:
  (usually included with SDisk)
• SDisk3: improved floppy disk driver for OS-9 Level II on the CoCo 3:
  (ad, user manual, disk image, source code)
• Filter Kit #1: wild card utilities, disk sector editor:
  (ad, user manual, disk image)
• Filter Kit #2: MacGen command macro generator, etc.:
  (ad, user manual, disk image)
• Hacker's Kit #1: disassembler (from file or memory) and related utilities:
  (ad, user manual, disk image)
• L1 Utility Pak: combination of Filter Kits #1 and #2 and Hacker's Kit #1, plus new utilities:
  (ad)
• L2 Utility Pak: improved printerr, software RAM-Disk driver, undelete, etc.:
  (ad, disk image)
• SKIO: hi-res (51x24) screen driver for CoCo OS-9:
  (ad)
• PC-XFER Utilities: read/write/format MS-DOS floppy disks, and transfer files between RS Disk BASIC and OS-9 disks:
  (ad)

If you have any of the user manuals or disk images missing from the list above, or have links to other web sites that contain them, please contact me.

Hardware products:

• 256KB DRAM board for SS-50 bus:  (ad)
• 1MB DRAM board for SS-50 bus:  (ad)
• 2MB RAM-Disk board for SS-50 bus:  (ad)
• CCRD 512KB RAM-Disk cartridge for CoCo:  (ad)
• Hemphill's DiskMaster expansion box for CoCo 3:  (ad)

If you have user manuals or colour pictures for any of these hardware products, please contact me.

I was in contact with Dan via e-mail in 2013, but that e-mail address is no longer valid, so am unable to contact him now. He was living in the Portland OR area.

"OS-9" is a registered trademark of Microware LP.
"Radio Shack" and "Color Computer" are trademarks of Tandy Corp.

Last revised 2025-Jun-02 20:02 PDT.
Copyright 2020- David C. Wiens.

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