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BC 5120/5150EP
Quick Reference Guide

Board Layout

Connectors

J1 Floppy Drive
J2 IDE Drive
J3 BC I/O
J7 LPT1
J8 COM2
J11 COM1
J12 Line Busy
J13 Ethernet
J14 SCSI (8 bit)

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

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

Switches

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
Factory settings (default) off off 
Note: If positions 1 and 2 are both set to ON, then loss
of DSR or DCD will reset the BC processor.

Switch 2 - Board Options and Interrupts

  sw1 sw2 sw3 sw4 sw5
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    
VGA Enabled         on
VGA Disabled         off
SCSI Terminator Enabled       off  
SCSI Terminator Disabled       on  
Factory settings (default) off on on off on

 

SIMM's and Memory Map

Simm Module Configuration

All 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
64 64 16 16 16 16 192
64 64 32 32     192
64 64 32 32 4 4 200
64 64 32 32 8 8 208
64 64 32 32 16 16 224
64 64 32 32 32 32 256
64 64 64 64     256
64 64 64 64 4 4 264
64 64 64 64 8 8 272
64 64 64 64 16 16 288
64 64 64 64 32 32 320
64 64 64 64 64 64 384

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)

 

I/O Map

0000-00FF Various "AT" functions
01F0-01F7 IDE hard drive interface
02F8-02FF COM 2
03A0 Cubix supervisory interface
03A8-03AF IES serial port
03B4-03B5 VGA
03BC-O3BF LPT1
03C0-03CF VGA
03D4-03D5 VGA
03F0-03F7 Floppy/IDE
03F8-03FF COM 1
   
PCI PORTS  
0CF8-0CFF Used by PCI chipset
FC00-FC7F Used by SCSI adapter
FF80-FF9F Used by Ethernet controller

 

Memory Configuration

10000-7FFFF 127MB Extended Memory
E000-FFFF 128KB Reserved for system and PCI ROM BIOS
CAA00-DFFF 96K Available as Expanded (EMS) or Upper Memory (UMB)
C800-CABFF 11K SCSI BIOS (if installed)
B800-BFFF 32K VGA/CGA Video Memory
B000-B7FF 32K VGA/Mono Video Memory
A000-AFFF 64K VGA Video Memory
0000-9FFF 640K Conventional DOS

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