Enterprise  Enterprise 128
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The Enterprise-128 was released A few months after the Enterprise 64, it is basically the same machine, but it was equiped with 128KByte of RAM, that the Z80 could access using bank switching. Internally, an extra circuit board was added that provided space for the extra RAM chips.

Just like the Enterprise-64, the Enterprise-128 is based on the popular Zilog Z80 8-bit CPU, and had two ASIC chips (Dave & Nick, after their creators) for sound and graphics. The sound and graphics capabilities of this machine were superior to many similar computers of the time. The case was colorful, and featured a built in joystick for games. Unfortunately due to delays and a softening computer market for 8-bit systems, the computer was not succesful and the manufacturer went into debt by 1986.

The system ran the EXOS Operating system, that was bundled with a word processor program on a 32K ROM chip. Another 16K ROM provided EXOS Basic. The sound was provided by the ASIC Chip called Dave, named after Dave Woodfield. The system had 3 sound and one noise channel. Unique to the system was that each of the channels can be played freely on the left or right channel, creating stereo effects that the competition could not. It also had options for distortion, low and high- pass filters and ring modulation to create rich sound effects.

Another ASIC chip, called Nick, named after Nick Loop who previously worked on the Acorn Atom computer, managed graphics. The system has the following graphics modes:

  • 640x512 - 2 colors, interlaced
  • 640x256 - 2 colors, non-interlaced
  • 320x256 - 16 colors out of a 256 color palette
  • 80x256 - 256 colors
Multiple pages could be displayed on the screen at the same time, even if they had different graphics modes, this allowed for instance to create a top part with 256 colors, and a bottom part with less colors, but a higher resolution. Each page also had it's own palette, which allowed for more than 16 colors to be displayed in higher resolutions. Pages could also be hidden for fast graphics effects.

Enterprise-64/128 back side connectors

  • 1 - Reset button
  • 2 - EXT1 External Joystick Connector
  • 3 - EXT2 External Joystick Connector
  • 4 - Printer Connector
  • 5 - Serial/Network Port
  • 6 - Tape Connector (In/Out/Remote)
  • 7 - RGB Monitor Connector
  • 8 - TV(RF) Connector
  • 9 - Power connector
Technical Details
Released 1986 Brand Enterprise Computer Type Enterprise Name Enterprise 128 CPU Class Z80 CPU Zilog Z80 @4MHz Memory RAM: 128kB Sound Chip ASIC (Dave) Sound 3 sound channels + 1 noise, each channel can be left or right
low/high pass filters
ring modulation effects
Display Chip ASIC (Nick) Display 640x512 2 color interlaced
640x256 2 color non-interlaced
80x256 256 color
320x256 16 color out of 256 (attribute graphics mode).
Best Color 256 colors Best Graphics 640x512 in 2 colors, interlaced Sprites software sprites System OS EXOS BASIC
Related Systems
Enterprise  128 (1986)
Related Media
Collection of books on the Z80 8-bit CPU used in various home-computers
World Wide Web Links