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BC 5055
Quick Reference Guide

Board Layout

 

Connectors

J1 - Floppy diskette

1 ground 2 speed 3 ground
4 n/c 5 ground 6 n/c
7 ground 8 index 9 ground
10 motor on 11 ground 12 drive sel 2
13 ground 14 motor sel 1 15 ground
16 motor on 2 17 ground 18 direction
19 ground 20 stop step 21 ground
22 write data 23 ground 24 write gate
25 ground 26 track 0 27 ground
28 write protect 29 ground 30 read data
31 ground 32 side select 33 ground
34 disk change

J2 - IDE Hard Disk

1 reset 2 ground 3 data 7
4 data 8 5 data 6 6 data 9
7 data 5 8 data 10 9 data 4
10 data 11 11 data 3 12 data 12
13 data 2 14 data 13 15 data 1
16 data 14 17 data 0 18 data 15
19 ground 20 n/c 21 n/c
22 ground 23 iow 24 ground
25 ior 26 ground 27 n/c
28 bale 29 n/c 30 ground
31 idint 32 n/c 33 sa1
34 n/c 35 sa0 36 sa2
37 cs5 38 hcs1 39 n/c
40 n/c

J3 - BC I/O connector

1 gnd 2 n/c 3 ledsel-
4 lanled 5 ideled 6 txdiled
7 rxdiled 8 n/c 9 dtriled
10 dcdiled 11 spkr 12 resetsw-
13 ack 14 poll 15 mseclk
16 mse data 17 kclk 18 kdata
19 + 5vf 20 vsync 21 hsync
22 gnd 23 blu 24 grn
25 red 26 gnd

J4 - Reset Connector

1 Resistor pull-up for Power on LED
2 not used
3 Reset switch (ground to reset computer)
4 IDE Drive LED
5 Ground

 

J5 - Speaker Connector

1 Speaker data
2 n/c
3 Ground
4 +5V (speaker power)

 

J6 - Supervisory Port

1 ack (to supervisor)
2 not used
3 poll (from supervisor)
4 not used

J7 - LPT1

This header requires a optional I/O adapter from Cubix. Attempting to connect a device directly to this connector will damage the board.

J8 - COMM 2

1 DCD (data carrier detect) 2 RD (receive data)
3 TD (transmit data) 4 DTR (data terminal ready)
5 GND (ground) 6 DSR (data set ready)
7 RTS (request to send) 8 CTS (clear to send)
9 RI (ring indicator)

Note: The COM2 header requires a optional I/O adapter from Cubix. Attempting to connect a serial device directly to this connector will damage the board.

J11 - COMM 1

1 DCD (data carrier detect) 2 RD (receive data)
3 TD (transmit data) 4 DTR (data terminal ready)
5 GND (ground) 6 DSR (data set ready)
7 RTS (request to send) 8 CTS (clear to send)
9 RI (ring indicator)

 

J12 - Line Busy (RJ11)

1 n/c 2 n/c
3 tip 4 ring
5 n/c 6 n/c

 

J13 - 10 Base-t Ethernet (RJ45)

1 transmit data (+) 2 transmit data (-)
3 Receive data (+) 4 n/c
5 n/c 6 receive data (-)
7 n/c 8 n/c

 

J14 - SCSI Interface

Information not available

Switch Settings

Switch 1 - Reset on Loss of DCD or DSR

  sw1 sw2
Reset when DSR drops on COM1 on off
Reset when DCD drops on COM1 off on
Reset when DCD or DSR drops on COM1 on on
Reset disabled off off

 

Switch 2 - Board Options and Interrupts

  sw1 sw2 sw3 sw4
Supervisory IRQ to 10 on off    
Supervisory IRQ to 15 off on    
Disable Supervisory IRQ off off    
PS/2 Mouse on IRQ 12     on  
Disable PS/2 Mouse     off  
Enable SCSI Termination       off
Disable SCSI Termination       on
Factory settings off on on off

IRQ, I/O, SIMM's & Memory Map

 

Simm Module Configuration

All BC system memory is provided in 72-pin by 36 bit standard 70ns SIMM modules. For the proper placing of SIMM modules, see table below.

1 2 3 4 5 6 Total
4 4         8
4 4 4 4     16
8 8         16
4 4 4 4 4 4 24
8 8 4 4     24
8 8 4 4 4 4 32
8 8 8 8     32
16 16         32
8 8 8 8 4 4 40
16 16 4 4     40
8 8 8 8 8 8 48
16 16 4 4 4 4 48
16 16 8 8     48
16 16 8 8 8 8 64
16 16 16 16     64
32 32         64
16 16 16 16 4 4 72
32 32 4 4     72
16 16 16 16 4 4 72
32 32 4 4 4 4 80
32 32 8 8     80
32 32 8 8 8 8 88
16 16 16 16 16 16 96
32 32 8 8 8 8 96
32 32 16 16     96
32 32 16 16 4 4 104
32 32 16 16 8 8 112
32 32 16 16 16 16 128
32 32 32 32     128
64 64         128
32 32 32 32 4 4 136
64 64 4 4     136
32 32 32 32 8 8 144
64 64 4 4 4 4 144
64 64 8 8     144
64 64 8 8 4 4 152
32 32 32 32 16 16 160
64 64 8 8 8 8 160
64 64 16 16     160
64 64 16 16 4 4 168
64 64 16 16 8 8 176
32 32 32 32 32 32 192

SIMM modules must be installed in pairs (SIMM 1 & SIMM 2, SIMM 3 & SIMM 4, SIMM 5 & SIMM 6).

IRQ Information

IRQ Description
0 Timer Click
1 Keyboard
2 Second PIC controller
3 COM2
4 COM1
5 Available/Ethernet
6 Floppy Disk Controller
7 LPT1
8 Real-Time Clock
9 Redirected IRQ2
10 Available/IES (s2)
11 Available/SCSI
12 Available/PS2 Mouse (s2)
13 Math Coprocessor
14 Fixed Disk Controller
15 Available/IES (s2)

Memory Configuration

E000-FFFF Reserved for system and PCI ROM BIOS
CAC0-DFFF Available as Expanded(EMS) or Upper Memory (UMB)
C800-CABF SCSI BIOS
C000-C7FF Reserved for VGA BIOS
B800-BFFF VGA/CGA Video Memory
B000-B7FF VGA/Mono Video Memory
A000-AFFF VGA Video Memory
0000-9FFF Conventional DOS

 

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