Brian Boutel

Wellington, NZ

retired

I programmed these in 1962. The basic memory was not 4KB, but 4K 39-bit words. Each word could store 2 instructions. The first 4 words of memory had hard-wired instructions that would read in a binary paper tape and load it into memory. This was usually used to load a loader program ("the TIs") that would read and load a paper tape containing a program at a higher level (numeric addresses in decimal relative to a block start). Toggling the console keys was not usual, except to specify a location to start loading.