Commodore VIC-20. It had an MOS 6502 CPU clocked at 1mHz (same CPU as Apple's I, II and IIe), 4K RAM. You had to buy a tape drive that uses audio cassettes for data storage, and it transfers something like 100 bytes per second or something.
Those were the good old/bad old days..
(P.S. that semiportable Commodore SX64 specs... MOS 6510 CPU 1mHz, one or two single-side double-density 5.25" floppy drives depending on config, uses a commodore-proprietary version of an RS232 serial port. 64K RAM, 320x200 16-color graphics.. Not too bad for its day, had some great games like Archon that are still very playable today.)