Gotek hardware I/O lines diagnostic/test firmware

Last modified: 03 March 2024

Since the Gotek floppy emulator is quite sensitive to ESD and other electrical issues, the floppy lines can be easily damaged.

This special firmware allows you to test/check all Gotek’s Input/Output lines with a simple wire. The test must be run with floppy ribbon disconnected from the machine. Once enabled/flashed with the diagnostic firmware, all outputs will toggle every 2 seconds.

All inputs states are displayed on the screen.

This firmware can be found in the Diagnostic_Firmware folder in the firmware archive.

Input lines test method

The default input states should be High (1), so to test an input line you have just to connect it to the ground/vss. On the floppy port you can use a jumper to make a contact between the input line and the ground (See floppy port pinout). Once the jumper is placed between the line pin and the ground/vss pin the corresping input state should turn to Low (0).

Output lines test method

All outputs are toggling every 2 seconds during the test.

Note	A 1 ms pulse is sent to the JB output at each toggle to test the buzzer ouput.

Connect the output line to test to one input line (use a tested input by the above method) with a simple wire. If the corresponding input status is toggling with the outputs line, then this means that the output line/driver is working properly.

LCD / OLED / 7 segments screens output/input status definition

LCD/OLED input lines status format : "IN:123456 789AB"

Table 1. Digit to pin assignment
Digit	Pin
1 or Digit-1-segment-a	Floppy Drive Select line (Pin 10 if S0 is set, Pin 12 if S1 is set or Pin 16 if MO jumper is set).
2 or Digit-1-segment-b	Floppy -Direction In (Pin 18)
3 or Digit-1-segment-c	Floppy -Step (Pin 20)
4 or Digit-1-segment-d	Floppy -Write Data (Pin 22)
5 or Digit-1-segment-e	Floppy -Write Enable (Pin 24)
6 or Digit-1-segment-f	Floppy -Head 1 Select (Pin 32)
7 or Digit-1-segment-g	Down push button (left)
8 or Digit-2-segment-a	Up push button (right)
9 or Digit-2-segment-b	Select push button (JA)
A or Digit-2-segment-c	Rotary CK (J7-2)
B or Digit-2-segment-d	Rotary DIR (J7-1)
7 Segments Digit-3	h when the outputs are high and L the outputs are low.
7 Segments Digit-2-segments e,f & g	ON when the outputs are high and OFF the outputs are low.

Floppy connector pinout

Table 2. Digit to pin assignment
Pin	Signal	Pin	Signal
01	Ground	(O)02	-High Density Select
03	Ground	04	Reserved
05	Ground	06	Reserved
07	Ground	(O)08	-Index
09	Ground	(I)10	-Drive Select 0 (*)
11	Ground	(I)12	-Drive Select 1 (*)
13	Ground	14	Reserved
15	Ground	(I)16	-Motor Enable (*)
17	Ground	(I)18	-Direction In
19	Ground	(I)20	-Step
21	Ground	(I)22	-Write Data
23	Ground	(I)24	-Write Enable
25	Ground	(O)26	-Track 0
27	Ground	(O)28	-Write Protect
29	Ground	(O)30	-Read Data
31	Ground	(I)32	-Head 1 Select
33	Ground	(O)34	-Diskette Change/Ready

(*)Depend on the S0/S1/MO jumper!

7 segments screen segments definition

Last modified: 03 March 2024

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