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TypePersonal computer
Release date1982; 37 years ago (1982)
MediaExternal disk drive
Operating systemLDOS and CP/M
CPUZilog Z80-B @ 5.07MHz
Memory64K, 128K max

The MAX-80 is a personal computer released in 1982 by Lobo Systems (formerly Lobo Drives International). It differed from other TRS-80 compatible computers in that it was not hardware compatible with the TRS-80.[1]


The MAX-80 featured a Zilog Z80-B CPU which ran at 5.07 MHz, a very fast speed for its time. It came standard with 64k of memory, and was expandable via sockets for a further 64k. The standard configuration originally consisted of a 64k unit (later 128k) and CP/M. The user could buy a complete system, or provide their own monitor and disk drives.[1]

The floppy disk controller could handle 8 inch drives using the standard IBM 3740 format in single-sided or double-sided modes, as well as 5.25 inch floppy drives with up to 80 cylinders. The Max-80 included a hard disk interface and two RS-232 serial ports. The Max-80's character generator was user programmable.


Up to 95% of TRS-80 Model III software would function without modification on the MAX-80. This did not include games. The special version of LDOS used was able to run most Model III programs with a patch disk available for those, such as VisiCalc, which it couldn't. The CP/M operating system was offered as well.[1]

A patched version of the TRS-80 Model 4's LS-DOS 6.x operating system was later made available for the Max-80. This was called MAXDOS.[2]


A users' group called MAXIMUL published a MAX-80 newsletter. MAXIMUL actually outlived Lobo Systems, lasting until 1989.[1]


  1. ^ a b c d Reed, Matthew. "The Lobo MAX-80". Retrieved 2010-11-24.
  2. ^ "The Lobo Max-80". Matthew Reed. Retrieved March 14, 2018.

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