LB Backplane Computer

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LB-RETRO-SET P1668-720px.jpg

Features

LB-BKPLANE-01 - Backplane

LB-BKPLANE-01 P1656-720px.jpg

  • LB-BKPLANE-01
  • 6 slot backplane
  • 64 connections
    • 2 power, 2 ground pins
    • 10 expansion pins
    • 0.6" slot spacine
  • Optional "light" terminators
  • Power connections via 2x8 header
  • 100x100mm card
  • (6) 4-40 mounting holes

Backplane Pinout

Pin LBMEM LBZ80 LB65C816 LBLOGIC
1 VCC VCC VCC VCC
2 VCC VCC VCC VCC
3 CPUA22 CPUA22 CPUA22 P2[6]
4 CPUA23 CPUA23 CPUA23 P2[7]
5 CPUA20 CPUA20 CPUA20 P2[4]
6 CPUA21 CPUA21 CPUA21 P2[5]
7 CPUA18 CPUA18 CPUA18 P2[2]
8 CPUA19 CPUA19 CPUA19 P2[3]
9 CPUA16 CPUA16 CPUA16 P2[0]
10 CPUA17 CPUA17 CPUA17 P2[1]
11 CPUA14 CPUA14 CPUA14 P4[6]
12 CPUA15 CPUA15 CPUA15 P4[7]
13 CPUA12 CPUA12 CPUA12 P4[4]
14 CPUA13 CPUA13 CPUA13 P4[5]
15 CPUA10 CPUA10 CPUA10 P4[2]
16 CPUA11 CPUA11 CPUA11 P4[3]
17 CPUA08 CPUA8 CPUA8 P4[0]
18 CPUA09 CPUA9 CPUA9 P4[1]
19 CPUA06 CPUA6 CPUA6 P0[6]
20 CPUA07 CPUA7 CPUA7 P0[7]
21 CPUA04 CPUA4 CPUA4 P0[4]
22 CPUA05 CPUA5 CPUA5 P0[5]
23 CPUA02 CPUA2 CPUA2 P0[2]
24 CPUA03 CPUA3 CPUA3 P0[3]
25 CPUA00 CPUA0 CPUA0 P0[0]
26 CPUA01 CPUA1 CPUA1 P0[1]
27 CPUD0 CPUD0 CPUD0 P12[0]
28 CPUD7 CPUD7 CPUD7 P12[7]
29 CPUD1 CPUD1 CPUD1 P12[1]
30 CPUD6 CPUD6 CPUD6 P12[6]
31 CPUD2 CPUD2 CPUD2 P12[2]
32 CPUD5 CPUD5 CPUD5 P12[5]
33 CPUD3 CPUD3 CPUD3 P12[3]
34 CPUD4 CPUD4 CPUD4 P12[4]
35 MEMRD* N/A N/A P3[7]
36 RAMSEL* N/A N/A P3[6]
37 IOCS* N/A N/A P3[4]
38 ROMSEL* N/A N/A P3[5]
39 GND GND GND GND
40 GND GND GND GND
41 N/A CPUCLK CPUCLK P3[3]
42 N/A RFSH VPA P3[2]
43 N/A INT* IRQB* P3[1]
44 N/A M1* VPB P3[0]
45 N/A NMI* NMIB* P5[7]
46 N/A CPURST* CPURESB* P5[6]
47 N/A HALT* ABORT* P5[5]
48 N/A BUSRQ* MLB P5[4]
49 N/A MREQ* VDA P1[7]
50 N/A WAIT* RDY P1[6]
51 N/A IORQ* IRQB* P1[5]
52 N/A BUSACK* CPUE P1[4]
53 N/A CPURD* CPUMX P5[3]
54 N/A CPUWR* RWB P5[2]
55 N/A N/A N/A N/A
56 N/A N/A N/A N/A
57 N/A N/A N/A N/A
58 N/A N/A N/A N/A
59 N/A N/A N/A N/A
60 N/A N/A N/A N/A
61 N/A N/A N/A N/A
62 N/A N/A N/A N/A
63 N/A N/A N/A N/A
64 N/A N/A N/A N/A

LB-65CXX-01

LB-65CXX-01 P1655-720px.jpg

  • LB-65CXX-01
  • 65C02 or 65C816 CPU
  • Oscillator on card
  • Reset switch/power monitor
  • Address decoder PLD drives RAM/ROM/IO chip selects
  • 100x50mm card

LB-6802-01

LB-6802-01 P1670-720PX.jpg

  • LB-6802-01
  • 68N02 CPU
  • Reset switch/power monitor
  • Address decoder PLD drives RAM/ROM/IO chip selects
  • 100x50mm card

LB-6809-01

LB-6809-01 P1090746 Rev2-720px.jpg

  • LB-6809-01
  • 68B09 CPU
  • Reset switch/power monitor
  • Address decoder PLD drives RAM/ROM/IO chip selects
  • 100x50mm card

LB-Z80-01

LB-Z80-01 P1658-720px.jpg

  • LB-Z80-01
  • Z80 CPU
  • Oscillator on card
  • Reset switch/power monitor
  • Address decoder PLD drives RAM/ROM/IO chip selects
  • 100x50mm card

LB-68B50-01

LB-6850-01 FRONT REV1(BLK).png

  • LB-68B50-01
  • 68B50 UART
  • Baud Rate Clock (38.4k baud oscillator)
  • XIAO RP2040 CPU
    • USB/Serial
  • 8-bit parallel port expander
    • SD card
  • 100x50mm card

LB-68B50-02

Lb-6850-01 P1672-720PX.jpg

  • LB-68B50-02
  • 68B50 UART
  • Baud Rate Clock (38.4k baud oscillator)
  • Control lines from PLD allow multiple Serial I/O cards
  • 100x50mm card

LB-LOGIC-01

LB-Logic-01 FRONT REV1(BLK).png

  • LB-LOGIC-01
  • Not required for BASIC computer
  • PSoC 5LP CPU
  • USB/Serial
  • 8 I/O pins
  • 3.3V/5V operation
  • Connects to all backplane pins
  • Reset Switch
  • 100x50mm

LB-MEM-02

LB-MEM-02 P1660-720px.jpg

  • LB-MEM-02
  • 32KB SRAM
    • Supports smaller (28-pin) SRAMs
    • Headers to jump for smaller cards
  • EPROM (up to 64 KB)
  • Connects to Address/Data and Memory control lines
  • 50x75mm card

LB-MEM-03

LB-MEM-03 P1659-720px.jpg

  • LB-MEM-03
  • EPROM/EEPROM card
  • 32-pin ZIF socket
  • Up to 1MB
  • Supports smaller SRAMs
    • Headers to jump for smaller parts
  • Connects to Address/Data and Memory control lines
  • 50x75mm card

LB-MEM-04

LB-MEM-04 REV1-FRONT-3D.png

  • LB-MEM-04
  • 32/128KB/512KB SRAM
    • Supports 32 and 28 pin SRAMs
    • Headers to jump for smaller cards
  • EPROM (up to 64 KB)
  • Connects to Address/Data and Memory control lines
  • 50x75mm card

LB-BKOUT-01 - Breakout Board

LB-BKOUT FRONT 3D.png

  • LB-BKOUT-01
  • Breakout all bus lines
  • PWR/GND bus down the middle
  • Can be used as NOP tester
  • 84 x 28mm

LB-BKOUT-02 - Breadboard/Breakout Board

LB-BKOUT-02 FRONT 3D.png

  • LB-BKOUT-02
  • Breakout all bus lines around breadboard area
  • PWR/GND bus down the middle
  • 3.3 x 1.7 in

Mini360 Adapter Board

Mini360 P1671-720px.jpg

  • Mini360_Adapter_Board
  • Adjustable output voltage level
    • Adjust for 5V output voltage nominal
      • 5.1V is a good starting point
    • Adjust before installing onto backplane
    • Pot is not easy to adjust
  • Wide range of input voltage up to 23V
    • About 1-2V higher (minimum) than output voltage
    • I used 9V, 1A wall wart
    • Works well with 9 or 12V DC wall warts
  • 2x10 header for power distribution
    • Male pins plug into 2x8 female pins on LB-BKPLANE-01 card
    • Other pins can be used for attaching scope ground or other peripheral cards
  • (2) 4-40 mounting holes

Typical Parts

Mouser # Mfr. # Manufacturer Customer # Description Price (USD)
774-MXO45-2C-1M0000 MXO45-2C-1M0000 CTS OSC_1.0MHz Standard Clock Oscillators 1.000000 MHZ Hybrid Circuit $1.61
774-MXO45-3C-1.8 MXO45-3C-1M8432 CTS OSC_1.8MHz Standard Clock Oscillators 1.84320 MHz $3.25
774-MXO45-3C-2.0 MXO45-3C-2M0000 CTS OSC_2.0MHz Standard Clock Oscillators 2.00000 MHz $2.27
556-AF16V8B15PU ATF16V8B-15PU Microchip PLD EEPLD - Electronically Erasable Programmable Logic Devices

15 ns 20 I/O Pins 8 macrocells 8 reg

$1.22
700-DS1813-5T&R DS1813-5+T&R Analog Devices Inc. PWR_MON Supervisory Circuits 5V EconoReset with Pushbutton $3.70
535-1107741 1107741 Aries Electronics SKT_04_DIP IC & Component Sockets OSCILLATOR FULL 4PIN $0.991
575-199320 110-99-320-41-001000 Mill-Max SKT_20_DIP IC & Component Sockets 20P TIN PIN TIN CONT $1.17
575-11044628 110-44-628-41-001000 Mill-Max SKT_28_DIP IC & Component Sockets 28P TIN PIN TIN CONT $1.63
575-1144632 110-44-632-41-001000 Mill-Max SKT_32_DIP IC & Component Sockets 32P TIN PIN TIN CONT $2.27
575-11044640 110-44-640-41-001000 Mill-Max SKT_40_DIP IC & Component Sockets 40P TIN PIN TIN CONT $2.61
517-4848-6000-CP 4848-6000-CP 3M SKT_48_DIP IC & Component Sockets 48P DUAL WIPE DIPSKT $1.23
652-4610X-1LF-10K 4610X-101-103LF Bourns Resistor Networks & Arrays 10pins 10Kohms Bussed $0.214
  • 2X40 Headers
  • MCP100-485DI/TO is a much less expensive part than the DS1813-T (I have not tested it) and it only monitor voltage (can't install reset switch)
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