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Glitch Works 8085 SBC User Manual And Assembly Manual

Rev 3
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Glitch Works 8085 SBC 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-ShareAlike 4.0" license.

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Summary of Contents for Glitch Works 8085 SBC

  • Page 1 Glitch Works 8085 SBC 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-ShareAlike 4.0” license.

  • Page 2: Table Of Contents

    3 Assembly 3.1 Assembling the 8085 SBC rev 3 ......3.2 Assembly Checklist ........

  • Page 3: Introduction

    Debounced reset and power supply supervisory circuit Glitchbus expansion header The 8085 SBC rev 3, when paired with GWMON, is a self-contained system needing only a serial terminal (or teminal emulation software on a PC) for full operation. GWMON for the 8085 SBC rev 3 includes Glitch Works ROM-FS, which allows for the storage of file records in ROM.

  • Page 4: Configuring I/O

    As implemented on the 8085 SBC rev 3, the Glitchbus is designed to stack above the SBC using PC/104 style stacking headers. Do note that some of the status and control lines are not fully buffered on the 8085 SBC rev 3 and are subject to loading limitations.

  • Page 5: Assembly

    Assembly The 8085 SBC rev 3 is designed to be easy to assemble for anyone with moderate soldering ability. It is a moderately complex board and will typically require between one and three hours of assembly time, depending on the skill of the assembler. The following tools will be required: Soldering iron, 20-40 W recommended, grounded tip Solder, 63/37 leaded solder recommended, Kester “44 Core”...

  • Page 6: Assembly Checklist

    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 F bypass capacitors (yellow axial bead) – position 2 on a 1/8 W lead form Install all 0.01 F capacitors in positions marked C in assembly diagram Hairpin bend three 4.7 kΩ...

  • Page 7: Insert Socketed Ics

    Insert MAX232 level shifter into socket at U21 Solder Console Cable Glitch Works parts kits include a DB25F connector for the 8085 SBC rev 3 console cable, as well as a one-foot pigtail terminated in a 5-pin Molex KK-100 connector. This pigtail connects to J6, RS-232 CONSOLE.

  • Page 8: Initial Checkout And Testing

    Troubleshooting If your 8085 SBC rev 3 fails to come up, recheck all solder joints for cold joints, bridges, or missed pins – this is by far the most common problem we’ve 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 box is very helpful here).

  • Page 9: Technical Notes

    Technical Notes Board Control Register The 8085 SBC rev 3 includes a board control register, which is a series of writable latches that affect how various parts of the built-in circuitry function. This register is addressed at I/O BASE + 0x02;...

  • Page 10: Default Memory Map

    Electrically, it is composed of an octal tristate bus transceiver. The bits of the board status register are mapped as follows: Register Bit Function Notes RPA0 switch, SW3-8 Closed reads 1 RPA1 switch, SW3-7 Closed reads 1 RPA2 switch, SW3-6 Closed reads 1 ROM Boot status Boot Enabled reads 1...

  • Page 11: Errata And Clarifications

    Errata and Clarifications Resistor Pack Values Kits provided at VCF East XIII (May 2018) included 18 kΩ resistor packs for both RP1 and RP2. 18 kΩ was discovered to be insufficient for 74LS85 address comparators, resulting in SW3 1-4 being ignored (ROM BASE always at 0xF000).

  • Page 12: Parts List

    Resistors may be of varying precision and body type If you purchased 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)
  • Page 13 3x 74LS245 tranceiver 1x 74LS373 octal D-type latch 1x 74LS688 magnitude comparator 1x 74HCT4040 12-stage binary counter 1x MAX232 RS-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-position Molex KK-100 header...

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