Kraft TopTrak

Archie
Site Admin
Posts: 122
Joined: 31 Jan 2019 15:27

Kraft TopTrak

Post by Archie » 02 Feb 2022 23:12

Ball size: 13/4" (44.43mm)
Interface: RS-232
FCC ID: BKL820149
Year: 1991

Image


The last (out of two) trackball from that company. Strangely enough, the button arrangements went back to the 'above the ball' position, while everyone else has already switched to the opposite - and the first Kraft Systems trackball, the TripleTrack, had the buttons below the ball. Buttons have exceptionally long pre-travel, with additional springs installed. Logically it's a 2-button device, while middle button generate the same signal as a simultaneous LMB+RMB press. Fourth button is a LMB click-lock (mechanical), and finally there's a RJ-11 connector for the foot pedal that duplicates the left button: the same as in TripleTrack.

Classic 5-bearings scheme is used, but the shafts are unusual: made of brass, with steel inserts at the ball contact places. Ball bearings are high-quality R-2ZZ made by NMB: despite the age, they're spinning like a new. As with most ball bearings based trackballs, the movement feel is quite smooth. Controller is 4-bit Toshiba TMP42C60P, OEM-branded for Kraft. Also, some 2N3904 and 2N3906 transistors are used. Calculated resolution is 194 PPR / 35 CPI.

Image Image

Image Image

Image Image


Actual manufacturer is most likely Anko Electronic (maker of Kraft joysticks and previous TripleTrack trackball). Separate PCB with switches is marked TB-600, in line with traditional Anko trackball names like TB-500, TB-700, TB-900, TB-2000.

Reviews published in 1991 - 1992 magazines:
Spoiler
Show
Image Image