user manual

Common Connectors
http://www.motorola.com/computer/literature 4-7
4
Floppy/LED Connector J4
A 50-pin high-density connector (J4 on the base board) supplies the
interface between the base board and an optional external floppy disk
drive. In addition to the disk drive control signals, a set of 16 lines is
available to drive an external LED array. The pin assignments are listed in
the following table.
171 L2TOE∗ GND DRVMOD0 172
173 L2TWE
∗ DRVMOD1 (N/C 174
175 L2TV NAPRUN (N/C 176
177 L2PRSNT1
∗ QREQ∗ 178
179 SRESET
∗ QACK∗ 180
181 HRESET
∗ CPUTDO 182
183 GND CPUTDI 184
185 CPUCLK1 CPUTCK 186
187 CPUCLK2 CPUTMS 188
189 CPUCLK3 CPUTRST
∗ 190
Table 4-3. Floppy/LED Connector
1+5VF +5VF2
3 LEDDISP0 LEDDISP1 4
5 LEDDISP2 LEDDISP3 6
7 LEDDISP4 LEDDISP5 8
9 LEDDISP6 LEDDISP7 10
11 LEDDISP8 LEDDISP9 12
13 LEDDISP10 LEDDISP11 14
15 LEDDISP12 LEDDISP13 16
17 LEDDISP14 LEDDISP15 18
19 LEDBLNK F_DENSEL 20
Table 4-2. Debug Connector (Continued)