I was planned to make a cross board for ZX Spectrum bus, but the slot has 2.50 mm pin step and special (Russian) plug is required. If anyone has more informations, please send to me.

http://8bit.yarek.pl/computer/zx.byte/

SIST slot
A - bottom B - middle C -top
1 GND* GND* GND*
2 /WN.UPR.RGB UPR I STR G
3 Y10 B /GASZ.ROM
4 /WN.BLK.CLK R /WN.RAZR.GCP
5 I STROKI
6
7
8
9
10
11 A6*
12 UPR ROM A2*
13 A9
14 A10
15 +12V A11 A4*
16
17
18 A5*
19 A1*
20 D4 D5*
21 D2* D1*
22 D7* D3*
23 /RD* 3.5MHz /WR*
24 /IORQ* /MREQ A15
25 /NMI D6* A14
26 /BUSAK A0* CLK
27 /M1 /HALT
28 A13 /BUSRQ /WAIT
29 A3* /INT
30 A7* /RFSH
31 /RESET* A8 A12
32 +5V +5V D0*
A - bottom B - middle C - top