From 'A Company on the Edge', page 545:
Commodore marketing scheduled the release of the TED computers for May 1984, but met with inevitable delays due to RAM shortages and problems with the supplier, Micron. "We had to wait on the 16 kilobyte DRAMs, which were brand-new back then," says Herd. "All of this wouldn't have mattered as it waited on the TED chip."
Temporary RAM shortages and delays in debugging a custom chip are commonplace enough, but I'm surprised at the remark that 16k DRAMs were brand-new in 1984; my understanding is that they were introduced in the mid-70s. What could Bil Herd have meant by this? Did the C16 and Plus 4 need RAM chips that were faster than those hitherto available?