© Copyright 1998-2026 Davidson Electronics | All trademarks acknowledged
Yes, that is a HH Tiger!
I’ve had this machine since around 1985, having being bought at a liquidation auction. Even back then it was apparent the machine was rare given the lack of software and support. It features a Z80 CPU, 64K RAM, 6809 CPU (for I/O) and a NEC 7220 graphics processor with 96K video RAM (512 by 512, 8 colour). It was primarily a CP/M machine with additional advanced graphic capabilities and a built in 1200 baud modem for Viewdata services. At the time, I explored the machine as best I could from available documentation (regrettably now lost…) and it served as a gateway to early dial-up services such as Prestel/Micronet. The monitor is a high resolution Microvitec device and when I later got an Amiga, I designed a circuit board to convert the monitor from TTL to analogue RGB for use with the Amiga. This probably saved this Tiger from being sold/disposed as the monitor was used for many years, long after it would otherwise have been considered useful. In recent years, I restored it back to operation and was fortunate to find all the disks that came with the machine, including all the Basic programs I wrote for it as a teenager. The disks were imaged using a Greaseweazle and the Tiger now boots from an HxC floppy emulator plugged into the rear disk expansion port on the monitor. Currently I’m not aware of another fully functioning complete Tiger elsewhere. The only software that shows off some of the graphics capabilities was TIGERDEM. The few other titles were standard text-only word processing and business apps typical for CP/M machines of that time. The TIGERTEL app was used to connect to Prestel/Micronet via the built-in modem.
Rear view of Tiger CPU
Connections: RS232, Centronics parallel, cassette, network, TTL video, light pen, GPIB (IEEE 488), modem cable. I’m uncertain what kind of networking interface was employed. I’m not aware of a lightpen in existence nor of any software that would have supported it. The cassette port is a mystery too given the Tiger boots CP/M from the floppy controller in the display unit (DDU). Without the DDU, the Tiger still tries to boot from floppy. Serial number is 20649
© Copyright 1998-2026 Davidson Electronics | All
trademarks acknowledged
Yes, that is a HH Tiger!
I’ve had this machine since around 1985, having being bought at a liquidation auction. Even back then it was apparent the machine was rare given the lack of software and support. It features a Z80 CPU, 64K RAM, 6809 CPU (for I/O) and a NEC 7220 graphics processor with 96K video RAM (512 by 512, 8 colour). It was primarily a CP/M machine with additional advanced graphic capabilities and a built in 1200 baud modem for Viewdata services. At the time, I explored the machine as best I could from available documentation (regrettably now lost…) and it served as a gateway to early dial-up services such as Prestel/Micronet. The monitor is a high resolution Microvitec device and when I later got an Amiga, I designed a circuit board to convert the monitor from TTL to analogue RGB for use with the Amiga. This probably saved this Tiger from being sold/disposed as the monitor was used for many years, long after it would otherwise have been considered useful. In recent years, I restored it back to operation and was fortunate to find all the disks that came with the machine, including all the Basic programs I wrote for it as a teenager. The disks were imaged using a Greaseweazle and the Tiger now boots from an HxC floppy emulator plugged into the rear disk expansion port on the monitor. Currently I’m not aware of another fully functioning complete Tiger elsewhere. The only software that shows off some of the graphics capabilities was TIGERDEM. The few other titles were standard text-only word processing and business apps typical for CP/M machines of that time. The TIGERTEL app was used to connect to Prestel/Micronet via the built-in modem.
Rear view of Tiger CPU
Connections: RS232, Centronics parallel, cassette, network, TTL video, light pen, GPIB (IEEE 488), modem cable. I’m uncertain what kind of networking interface was employed. I’m not aware of a lightpen in existence nor of any software that would have supported it. The cassette port is a mystery too given the Tiger boots CP/M from the floppy controller in the display unit (DDU). Without the DDU, the Tiger still tries to boot from floppy. Serial number is 20649
