Printer	24 Way Ribbon socket
1 -- Strobe (negative true)	13 -- Ground
2 -- Data 0	14 -- Ground
3 -- Data 1	15 -- Ground
4 -- Data 2	16 -- Ground
5 -- Data 3	17 -- Ground
6 -- Data 4	18 -- Ground
7 -- Data 5	19 ----Ground
8 -- Data 6	20 -- Ground
9 -- Data 7	21 -- Ground
10 -- Acknowledge (negative true)	22 ---Ground
11 -- No connection	23 -- Ground
12 -- No connection	24 -- Ground

	Disc	25 Way D-type socket
1	Index	14---- Ground
2	Drive select 0	15 -- Ground
3	Drive select 1	16 -- Ground
4	No connection	I 7 -- Ground
5	Load Head/Motor Control	18 -- Ground
6	Direction	19 -- Ground
7	Seek/Step	20 -- Ground
8	Write Data	21 -- Ground
9	Write Enable	22 -- Ground
10	Track 0	23 -- Ground
11	Write Protect	24 -- Ground
12	Read Data	25 -- Ground
13	Side Select
App 11.2