Old Skooler ramblings has a fantastic write-up of the twenty-five year old PCjr., IBM's embarrassing attempt at designing an affordable, entry-level computesr to '80s consumers. Its primary failing? It was actually less IBM compatible than the clones on the market at the time. But the PCjr was filled with similar juicy design fuck-ups:
• Because of no DMA capability, the computer needed to use the CPU to read the floppy disk, grinding the machine to a halt every time a floppy was accessed.
• The PCjr. was the only PC ever created that was slower than the original IBM PC.
• A modular design that allows you to simply plug-in additional PCjr. hardware, but which effectively doubled the PCjr's physical size.
• Memory expansion sidecars were required to approach rudimentary compatibility with most PC programs.
Of course, some good came out of it all: the PCjr was the computer Tandy eventually decided to clone and enhance, leading to the creation of the crackerjack Tandy 1000.
25 Years of Junior [Oldskooler Ramblings]