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PC RAM Extenders, Part 2 of 4: Memory limits and extenders

SERIES TITLES
PC RAM Extenders, Part 1 of 4: Number Systems
*>PC RAM Extenders, Part 2 of 4: Memory limits and extenders
PC RAM Extenders, Part 3 of 4: Windows Memory Management
PC RAM Extenders, Part 4 of 4: Windows RAM Tools
I was at IBM R&D in Vermont when their first 1 kilobyte chip was announced to the electronics [...]

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Disk Partitions, Disk Images, and Backups

Progress in computer hardware and software is often a leap-frog process, and this affects how users can do things.
In the early 1980s, IBM R&D provided me a model 1 Personal Computer (actually the 5150), which came with a mere 64Kb RAM and two 360Kb floppy drives, plus IBM/MS DOS 1.0. Looking back, that was pretty [...]

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Personal Computers and Software Zippers, a Reminiscence

I got my first IBM Personal Computer model PC-1 (actually the 5150) in 1982 while I was in IBM R&D. It was to serve both as a low power computer and as a data terminal by means of a cable adapter. It came with the minimal 64Kb of RAM, so I immediately had to order [...]

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Computers and shareware / trialware

Before software matters, there must be computers.
HARDWARE:
Early 1970s, several hobbyist computers were available as kits, and really were not capable of much.
1975 The IBM General Systems Division announced the IBM 5100 Portable Computer in September 1975. It was a desktop machine of about 50 pounds, could be programmed in APL and BASIC. Definitely not in [...]

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