4 has a calculator-style chiclet keyboard and a character set that lacked lowercase text. 4A added an additional graphics mode, “lowercase” aluminum tokens consisting of small capitals, and a full-travel keyboard.
4 series the first 16-bit home computers. The power regulator board is housed below and in front of the cartridge slot under the sloped area to the right of the keyboard. 4 console, including the rare Thermal Printer. 4’s original expansion concept was that peripherals would be connected serially to the console and each other, in a “daisy-chain” fashion. The “sidecar” expansion units can be connected together in a continuing chain, but can rapidly occupy an entire desktop and cause crashes and lockups due to the large numbers of connectors on the system bus.