"CLOAD" The TRS-80, Model 1, was my first PC. It had no clock, no DOS, no disk, and no mouse. It always greeted me with "READY?_." But, it was magic with a power cord. In its day it outsold the Apple II. The TRS-80 was to personal computing what the Model A Ford was to transportation.
TRS is an acronym for Tandy Radio Shack; the 80 refers to the Zilog 80 processor it sported. The TRS-80 was introduced in 1977. I bought mine in 1979, used, for $400.00 (new was $600.00). Been messing with PCs ever since
The Model 1 package included monitor/processor, Qwerty keyboard, power supply and audio cassette drive. The base model 1 had 4K of RAM which was expandable to 48K. Other options included an RS 232 port, 5 1/4" floppy drives, and hard drives. It was a metaphorical surfboard positioned to catch an information technology tsunami.
The monitor displayed uppercase characters only; a maximum of 64 per line in 16 lines. Rudimentary graphics were available via Radio Shack BASIC. Points could be located and lines could be drawn. While primitive, the graphics offered lots of possibilities.
The Model 1 used a Radio Shack audio cassette player with remote control for storage. The unforgettable "CLOAD" & "CSAVE" were cassette retrieval and storage commands.
The TRS-80 Model 1 with 16K of RAM was used by a major manufacturer, in the early 1980s, to deliver instructional materials and problem solving exercises. According to rumor, during course validation a frequently asked question was "What the hell is a CLOAD?"