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OMEN Bravo

As-easy-as-possible, but still expandable single board computer with 65C02 CPU.

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Do you know the OMEN Alpha? Bravo is a 65C02-based brother of this SBC. It was made to educational purposes, so it is keep as simple as possible.

Features

  • 65C02 CPU by Rockwell operated at 3.6864 MHz (You can use the WDC version too)
  • 32 kB of static RAM
  • 8 kB of EEPROM (in fact, you can use up to 32 kB chip. You can select one of two banks by a switch)
  • ACIA 6551 for serial port, provides serial communication up to 19.200 Bd
  • A "System Bus Connector" with data bus, address lines, control lines and decoded I/O addresses.

bravo-v2.sch

EAGLE schematics

sch - 891.09 kB - 08/10/2018 at 15:53

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bravo-v2.brd

EAGLE board

brd - 275.38 kB - 08/10/2018 at 15:53

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bravo-issue2.png

Full schematics

Portable Network Graphics (PNG) - 182.11 kB - 08/10/2018 at 15:53

Preview
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  • 1 × R65C02 Microprocessors, Microcontrollers, DSPs / Microprocessors (MPUs)
  • 1 × R6551 Connectors and Accessories / Connector Accessories
  • 2 × 22 nF capacitor
  • 1 × 10M capacitor
  • 1 × 62256

View all 12 components

  • Ah, the brave old 6502...

    Martin Maly09/04/2018 at 20:31 0 comments

    It seems to be totally simple, but this was my first 6502 construction I ever designed.

    So I have made a design, have prepared a PCB, the last few wires by autorouter (keep it in mind!) and have sent to fab.

    A few days ago I have connected the whole design. And then: nothing. No single tick. It was very strange... When I have removed the 7400 (RD/WR and address decoder), the oscillator worked. 7400 back, frequency: 0.

    Totally bad dream. Later I have found the one line from CPU is routed directly through the Xtal, just between its two pins. I have cursed myself. Twice.

    The second PCB version works on the first attempt. So design was right. My mistake was the autorouting. All other PCBs are now manually routered until the last via...

    (Don't worry, the piece I am selling on Tindie is the Issue 2)

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