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3.2

Assembly Checklist

Verify parts list against kit contents or builder-provided parts

Consult the assembly drawing for component locations and values

Bend all 0.01

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F bypass capacitors (yellow axial bead) – position 2 on a 1/8 W lead form

Install all 0.01

µ

F capacitors in positions marked C in assembly diagram

Hairpin bend three 4.7 kΩ resistors and set aside

Bend remaining 4.7 kΩ resistors and install in their marked locations – position 1 on a 1/4 W
lead form

Bend all 330 Ω resistors and install in their marked locations – position 1 on a 1/4 W lead form

Install non-socketed DIP ICs at their marked locations. Do not install U9, U15, U16, U17,
U19, or U21

Install a 16-pin socket at U21

Install 28-pin sockets at U15, U16, U17, and U19

Install a 40-pin socket at U9

Install 22

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F 10V capacitors at C8 and C17, bend leads with needle-node pliers

Install micro tact pushbutton at SW1

Install 20 pF radial ceramic capacitor at C9

Install 10 nF radial ceramic capacitors at C1, C16

Install resistor packs at RP1, RP2

Install DIP switches at SW2, SW3

Install five 22

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F 16 V radial electrolytic capacitors at C25 - C29

Install TO-92 DS1233 at U1

Hairpin bend all 1 kΩ resistors and install at R21, R22

Install three previously hairpinned 4.7 kΩ resistors at R3, R4, R20

Install three LEDs at D1, D2, D3

Break the 22-pin pin header strip into two 8-pin sections and two 3-pin sections

Install two 3-pin header sections at J1, J2

Install two 8-pin header sections next to one another at J5

Install 4 MHz CPU clock crystal at Y1

Install 2.4576 MHz serial clock crystal at Y2

5

Summary of Contents for 8085 SBC

Page 1: ...rev 3 GW 8085SBC 3 User s Manual and Assembly Guide Revision 1 2018 06 30 c 2018 The Glitch Works http www glitchwrks com This manual is licensed under a Creative Commons Attribution NonCommercial Sh...

Page 2: ...cklist 5 3 3 Insert Socketed ICs 6 3 4 Solder Console Cable 6 4 Initial Checkout and Testing 7 4 1 Troubleshooting 7 4 2 Repair and Service 7 5 Technical Notes 8 5 1 Board Control Register 8 5 2 Board...

Page 3: ...atically selected by option switches on reset power up This also allows for in board updates to GWMON without overwriting the current known good copy 2 Configuration The 8085 SBC rev 3 includes a numb...

Page 4: ...rk both J1 and J2 must be strapped for 2 3 2 3 Interrupt Jumpering The five hardware interrupt lines of the Intel 8085 are pulled down to an inactive state with 4 7 k resistors While they are not used...

Page 5: ...rn adafruit com adafruit guide excellent soldering 3 1 Assembling the 8085 SBC rev 3 If you purchased a full Glitch Works parts kit we recommend completing all assembly sections since extra features c...

Page 6: ...at U21 Install 28 pin sockets at U15 U16 U17 and U19 Install a 40 pin socket at U9 Install 22 F 10V capacitors at C8 and C17 bend leads with needle node pliers Install micro tact pushbutton at SW1 In...

Page 7: ...table to build a console cable appropriate to your intended terminal J6 Pin DB25F DCE Pin DB25F DTE Pin Function 1 5 4 Request to Send 2 3 2 Transmit Data 3 2 3 Receive Data 4 4 5 Clear to Send 5 7 7...

Page 8: ...observed during assembly workshops Recheck configuration options Ensure your serial terminal or terminal emulator software is properly config ured and that your cable is wired correctly a RS 232 light...

Page 9: ...ows the 8085 to read ROM code at 0x0000 on reset Writing a 0 to this bit clears it and immediately switches off the ROM Boot functionality Typically ROM boot code should contain a jump to a startup ro...

Page 10: ...p flop ROM Boot is enabled when this bit reads 1 Bit 4 reflects the status of the ROM Enabled flip flop ROM is enabled when this bit reads 1 Bits 5 7 reflect the state of the ROM Page Address latch wh...

Page 11: ...lting in SW3 1 4 being ignored ROM BASE always at 0xF000 All later parts kits include 10 k or smaller resistor packs for both positions Thanks to Josh Bensadon for reporting this error 6 2 ROM Compati...

Page 12: ...chased a full Glitch Works parts kit be sure it includes the following 1x 20 pF radial ceramic capacitor 19x 0 01 F axial ceramic capacitor yellow bead 2x 10 nF 16 V radial ceramic capacitor 2x 22 F 1...

Page 13: ...S 232 level shifter 1x DS1233 EconoReset 2x 8 position DIP switch 3x red T 5 LED 1x mini tact pushbutton switch 1x 22 pin breakaway header strip 2x jumper shunt 1x 2 position Molex KK 100 header 1x 5...

Page 14: ......

Page 15: ...16 A13 26 RESET_IN 36 AD5 17 A14 27 CLK_OUT 37 AD6 18 A15 28 HLDA 38 AD7 19 S0 29 HOLD 39 U9 8085 GND GND VCC VDD VSS C19 C C20 C C21 C C22 C C23 C C24 C C12 C W1 MTG W2 MTG W3 MTG W4 MTG GND Mounting...

Page 16: ...74LS32 BR W RD STATUS_REG_CS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SW2 I O BASE BA7 BA6 BA5 BA4 BA3 BA2 RP2 10K GND VCC AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 Q11 1 Q5 2 Q4 3 Q6 4 Q3 5 Q2 6 Q1 7 Q0 9 CLK 10...

Page 17: ...e Select Logic Memory Devices CONTROL_REG_CS A B 1 A0 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 B7 11 B6 12 B5 13 B4 14 B3 15 B2 16 B1 17 B0 18 CE 19 U18 74LS245 STATUS_REG_CS RPA0 RPA1 RPA2 ROM_ENABLED RO...

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