# S-132 Bill of Materials (Draft)

Note:

The BOM is yet to be updated to include details of

  • the USB interface for USB-HID keyboard support

TIP

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Notes on the PCB

  • PCBs are pre-production (V1.5) and will be revised
  • Part identifiers are correct and there are no known errors
  • However, component numbering sequences contain gaps, there is no:
    • U5
    • R14 - R17
    • C8, C9

# Main S-132 PCB (green)

# Surface Mount Device (SMD) components

Don't Panic

  • Yes there are four SMD components!
  • You can do it!
  • You can do it with a regular soldering iron, but you are going to need flux
Part Quantity PCB Description
ESP32-WROVER 1 ESP32-WROVER (U1)

ESP-32 WROVER Module

NCP1117-33 1 NCP1117-33 U2

NCP1117-33 LDO Linear Regulator

74HC00 1 74HC00 U10

74HC00 SOIC-14 Quad NAND Gate

74CBTLV3257 1 74CBTLV3257 U3

74CBTLV3257 SOIC-16 Quad 1-of-2 Multiplexer/Demultiplexer

# Through Hole (THT) components

Part Quantity PCB Description
120 Ohm 2 R1, R2

120 Ohm Resistor [Brown, Red, Black, Black, Brown]

Only required if using the PS/2 keyboard
2K Ohm 2 R3, R4

2K Ohm Resistor [Red, Black, Black, Brown, Brown]

Only required if using the PS/2 keyboard
10K Ohm 1 R5, R13

10K Ohm Resistor [Brown, Black, Black, Red, Brown]

806 Ohm 3 R6, R8, R10

806 Ohm Resistor [Grey, Black, Blue, Black, Brown]

402 Ohm 3 R7, R9, R11

402 Ohm Resistor [Yellow, Black, Red, Black, Brown.]

4K7 Ohm 1 R12

4.7K Ohm Resistor [Yellow, Violet, Black, Brown, Brown]

121 Ohm 1 R18

121 Ohm Resistor [Brown, Red, Brown, Black, Brown]

243 Ohm 1 R19

243 Ohm Resistor [Red, Yellow, Orange, Black, Brown]

487 Ohm 1 R20

487 Ohm Resistor [Yellow, Gray, Violet, Black, Brown]

976 Ohm 1 R21

976 Ohm Resistor [White, Violet, Blue, Black, Brown.]

Diode 4 D1, D2, D3, D4

1N4148 Signal Diode

Diodes have polarity, ie. they must be inserted the correct way around to function properly.
100 nF Capacitor 7 C1, C6, C7, C10, C11, C12, C15

100 nF (104) MLC Capacitor

1 uF Capacitor 1 C2

1 uF MLC (105) Capacitor

100 uF Capacitor 2 C3, C13

100 uF Electrolytic Capacitor

Electrolytic capacitors have polarity, ie. they must be inserted the correct way around to function properly.
22 uF Capacitor 1 C4

22 uF Electrolytic Capacitor

Electrolytic capacitors have polarity, ie. they must be inserted the correct way around to function properly.
10 uF Capacitor 2 C5, C14

10 uF Electrolytic Capacitor

Electrolytic capacitors have polarity, ie. they must be inserted the correct way around to function properly.
S8050 1 Q1

S8050 NPN Transistor TO-92

Tactile Switch 2 Prog, Reset

Tactile Push Button Switch SPST

Buzzer 1 Bell

Buzzer 12.2mm dia.

The Buzzer is polarized, ie. it must be inserted the correct way around to function. +VE to the Square Pad
74HC165 1 U4

74HC165

Shift Register 8-bit, parallel load
MCP3008 1 U6

MCP3008

8 Channel 10-bit Analog-to-Digital Converter (ADC)
74HC138 1 U7

74HC138

3-to-8 line Decoder/Demultiplexer, inverting
74HC595 1 U8

74HC595

8-bit serial in/out Shift Register 3-State Outputs
LM7805 1 LM7805 U9

LM7805 Linear Regulator

# Through Hole (THT) headers

Part Quantity PCB Description
Header 2pin 1 JP1 5V Pwr

2 Pin Header - Horizontal

Header 6pin 1 FTDI Program

6 Pin Header - Vertical

Header 6pin 1 Keyboard

6 Pin Header - Vertical

Only required if using the USB-HID keyboard
Header 4x2 Male 1 Patch

8 Pin Header (4x2)- Vertical

See notes for use of this header
Header 8x2 Female 1 S-132

16 Pin Header (8x2)- Female, Vertical

Fit to the underside of the PCB - attaches to the IMSAI8080/Cromemco Z-1
Header 2pin 1 KB Reset

2 Pin Header - Vertical

Only required if using the USB-HID keyboard
Shunt 6 For JP1 & Patch as required

Header Pin Shunts

Connector 20x1 Female 2 not marked

Connector 20x1 Female

Sits between the DIP-16 IC sockets. These two connectors form a 40-pin socket for the D+7AIO

# Through Hole (THT) connectors

Part Quantity PCB Description
VGA DB15 1 VGA

DB15 VGA Female Socket - Right Angled

PS2 KBD 1 PS/2

Mini-DIN-6 PS/2 Keyboard Female Socket - Right Angled

Only required if using the PS/2 keyboard
Power 1 Power

6.2mm DC Barrel Jack Connector

16pin DIP Socket 4 (U4, U6, U7, U8)

16 pin DIP Socket

One for each IC - U4, U6, U7, U8

# Printed Circuit Board (PCB)

Part Quantity Description
PCB Front 1

Front view

# Mounting hardware

Part Quantity Description
M4x10 Hex Socket Screw 1

M4x10mm Hex Socket Screw

The M4 socket screw is used to fix the S-132 to the clear acrylic back of the IMSAI80080/Cromemco Z-1. You will need to tap or drill a hole to secure the M4 socket screw.
M4 Hex Nut 1

M4 Hex Nut Nylon

The nut can be used as a spacer between the S-132 PCB and the acrylic back of the IMSAI80080/Cromemco Z-1
M3x5 Machine Screw 1

M3x5mm Zinc Machine Screw & Washer

The M3 machine screw, washer and nut are used to secure the LM7805 to the S-132 PCB, to aide thermal conduction with the PCB.
M3 Nut 1

# Joystick Adapter (yellow)

Part Quantity PCB Description
Header 40pin 1 Pin 1

40 Pin Header (20x2)- Horizontal

Fit to underside of PCB.
Header 4x2 Male 2 Pad 1, Pad 2

8 Pin Header (4x2)- Horizontal

Fit to top of PCB.
10K Ohm 8 R#### - ####

10K Ohm Resistor [Brown, Black, Orange, Gold]

Part Quantity Description
PCB Front 1

Front view

# JS-1 Analog Joystick (yellow x 2)

Part Quantity PCB Description
Tactile Switch 4 each SW1 - 4

Tactile Push Button Switch SPST

Analog Joystick 1 each

2-axis Analog Joystick - 10Kohm

Header 4x2 Male 1 each

8 Pin Header (4x2)- Horizontal

Fit to top of PCB.
Part Quantity Description
PCB Front 2

Front view

# Parallel Printer (red)

Part Quantity PCB Description
Header 40pin 1 Pin 1

40 Pin Header (20x2)- Horizontal

Fit to underside of PCB.
DB25 1 Printer

DB25 Female Socket - Solder lug

Part Quantity Description
PCB Front 1*

Front view

# Prototype Adapter (green)

Part Quantity PCB Description
Header 40pin 1 Pin 1

40 Pin Header (20x2)- Horizontal

Fit to underside of PCB.
Part Quantity Description
PCB Front 1*

Front view

Last Updated: 1/20/2023, 6:37:51 PM