design the PC to use any old off-the shelf cassette tape recorder made the load and save speeds slow. The need to keep the end-user cost down dictated the need for extra complexity to output a TV signal capable of working with a domestic TV. When TI finally did put the 99/4 onto the European market a few months later, it was initially sold only in a pair with an American NTSC TV because it could not drive European PAL and SECAM sets. Further technical details CPU: Intel 8080A at 2 MHz Memory: a maximum of 48 kB dynamic RAM, 24 kB ROM and 256 Bytes of static RAM (stack RAM) Keyboard: 56 Keys Video: EF9369, PAL compatible UHF CH 36 color-TV (antenna) output signal with audio Text mode: 60 characters × 24 lines (66 characters per line supported) Graphics modes: Low - 88 x 65 pixels; Medium - 176 x 130 pixels; High - pixels; Very high - pixels (non-square) available colors: 4 or 16 colors (16 color mode was actually 4 color palette) Sound generation: 3 frequency generators + 1 noise generator (General Instrument AY-3-8910?) Game controllers: 2 input interfaces for paddles or joysticks (DIY). Each can control three 0-5V inputs and a switch. Storage: 2 separate audio-cassette interfaces, using a cable for data INPUT/OUTPUT and START/STOP switch, (600 Baud) Alternative main storage systems: Memocom MDCR-D, Mini Digital Cassette Recorder (which used Philips minicassettes) Two 5.25 inch floppy disk drives, 2 x 180K (which enabled the use of CP/M). Compatible with optional card rack, the ("DAI Real World Card System"), control system. I/O Connectors: Serial port RS-232, DB-25 female. 2 audio-cassette ports, 2 x 6 pin DIN female. Parallel port DCE-Bus, DAI proprietary 3 x 8 bit parallel port, 36 pin DIL male. 2 Paddle interfaces, 2 x 6 pin DIN female. Stereo audio output, 6 pin DIN female. UHF video and audio output, RCA (cinch) female. AC power input, with voltage selector 220-110 volt, figure 8 shape AC power 2 pins male. System software: a machine code monitor with the following commands: LOOK DISPLAY GO FILL SUBSTITUTE MOVE EXAMINE EXAMINE REGISTERS VECTOR EXAMINE VECTOR EXAMINE BYTES READ WRITE a built in DAI BASIC interpreter. the system was also supported with an 8080-Assembler. miscellaneous: a true random number generator implemented in hardware. DAI the company Data Applications International (DAI) was a company from the end of the 70s