Track-Master is a device which displays current track (and halftrack) position of the R/W Head.

I have no documentation nor a manual for this device and very little information is available, therefor I will try to summarize a bit from the adverts found from around 1985-86.

There are three versions mentioned in the adverts, Track-Master(external), Track-Master plus(external with audio alert) and Track-Master GT (internal version of the plus).

1541,1571 and SX-64 are supported and “soon” available for Amiga and non-commodore drives.

* Digital display showing track, half and fat tracks 1-40.
* Control switch settings displayed on the LED.
* Audible alert when writing to the disk or when track sync marks are not normal.
* Control swithes allow you to:
   Set drive unit to 8 or 9.
   Write protect disks electrically.
   Bypass write protect (use both sides of a disk without notching).

Track-Master uses the stepper movement to display current track/halftrack and works with all sort of loaders. It has no way of knowing the exact position of the R/W head and resets to track 18 when drive is reset. This is a close assumption as the drive always start reading track 18 for a file or directory in normal load operation, which is perfectly fine. If you move the R/W head manually a few tracks it will assume the head was never moved and show wrong track number until next reset. Sometimes it starts off with track 19 when it should be 18, a reset of the drive fixes this problem.

 

 


Control Switches (assumed operation by testing):
8/9 : Device number. A LED dot is lit when device 9 is selected.
W/T : Audible alert when (W)riting to disk or when (T)rack sync is not normal.
N/P : (N)ormal / Write (P)rotection. Extra LED segment lit when active.
N/B : (N)ormal / (B)ypass write protect tab. LED display blinking when in bypass mode.

 


All ICs and transistors have their markings grinded off to prevent duplication of the board.

 

 

 


Signed by the previous owner, “Mitch ESI. Rush Rules!” 🙂

 


Drive PCB wiring.


PCB #251830
Blue     Capacitor C16 + (5V)
Green    Capacitor C16 - (GND)
Black    UA1 Pin 5 (WPS - Write Protect Sensor)
White    UC1 Pin 10 (Step)
Gray     UC1 Pin 12 (Step)
Brown    UC1 Pin 37 (Sync)
Purple   UC1 Pin 36 (Mode;Read/Write)
Red      UC2 Pin 19 (Mode;Read/Write). Note:Lift up pin 19 from the socket.
Orange   Device number pad, cut jumper and solder wire.
Yellow   Capacitor C46 + (Reset)
UC1      Add 10K pull-up resistor between Pin 1 (VCC) and Pin 36.

 


First part is fast formatting a disk, and second is loading a game where it switches to a fastloader after a while. The video does not quite do justice for the 7-segment LED display as it is more distinct in reality.

 
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Compute Gazette Issue 24 (1985 Jun) Page 128
Compute Gazette Issue 35 (1986 May) Page 122
Compute Gazette Issue 39 (1986 Sep) Page 124