•48-64K 16-bit words of memory (plus parity and perhaps
•A 10 megabyte Diablo
disk which transfers one word every 7 us, rotates in 25 ms, and has a track-to-track seek of 8 ms, and worst-case seek of 70
•A 901 line TV monitor
whose display surface is almost exactly the size of this page. It is oriented vertically, and is designed to be driven from
a bit map in the memory. It takes 32K of memory to fill the display area with a square
(825x620) raster. These dots are about 1.4 mils square. It is possible to reduce their width to about
1 mil, which gives an 825x860 raster and 44.3K of memory. The square raster can display 8000
5x7 characters with descenders or 2500 beautiful proportionally-spaced characters.
•An undecoded keyboard
which allows the processor to determine exactly when each key is depressed or released, and a mouse or other pointing
•A processor which
executes Nova instructions at about 1.5 us/instruction, and can be extended with extra instructions suitable for
interpreting Lisp, Bcpl, MPS, or whatever.
•A high-bandwidth (10
MHz) communication interface whose details are not yet specified.
•Optionally, a fixed-font
character generator similar to the one designed and built by Doug Clark. This would save a lot of memory and would
permit higher quality characters than can be done with a square raster, but adds no basically new
capability. It should cost about $500.
•Optionally, a Diablo
printer, XGP, or other hardcopy device.
•A table about 45"
wide and 25" deep to house the machine and mount the display and keyboard.
•Most important, a cost
of about $lO.5K, which can be reduced to $9.7K by the use of a 2.5 megabyte disk. The cost is about equally split among
disk, memory, and everything else. We have spent about twice as much on Maxc per 1974 CSL