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Omen Alpha Technical Documentation Manual

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OMEN ALPHA
=========
OMEN Alpha / issue 4
Technical Documentation
OMEN Computers - - -
https://github.com/osmibity
- - - Page: 1

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  • Page 1 OMEN ALPHA ========= OMEN Alpha / issue 4 Technical Documentation OMEN Computers - - - https://github.com/osmibity - - - Page: 1...

  • Page 2: Introduction

    OMEN ALPHA ========= INTRODUCTION =========== The OMEN Alpha computer kit is a low-cost computer trainer, based on the Intel 80C85 CPU. It has these features: - 80C85 CPU working at 1.8432 MHz - 32 kB RAM - 32 kB EEPROM - Serial port up to 115.200 Bd / MC6850...
  • Page 3 8. Start the serial terminal on your PC, select proper serial port and set the parameters to 115.200 Bd, 8 data bits, no parity, 1 stop bit. 9. Power your Alpha and check the terminal. OMEN Computers - - - https://github.com/osmibity...
  • Page 4 ========= MONITOR ======= The main software for OMEN Alpha issue 4 is the Dave Dunfield’s MON85 Serial Monitor, improved by Roman Borik. Usage is described on the https://8bt.cz/mon85 or see the Appendix 1 You can invoke the installed Tiny BASIC v.2 by jumping to the 1000h – just enter “G1000”...
  • Page 5 JP7: RST7.5 enabler. Close to disable interrupts, open to leave it on the application bus. Connect the 10k resistor to make it “open-collector signal”. JP8: Serial signals SID and SOD OMEN Computers - - - https://github.com/osmibity - - - Page: 5...
  • Page 6 | Vcc | PB0 | PB1 | PB2 | PB3 | +-----+-----+-----+-----+-----+ JP4: +-----+-----+-----+-----+-----+ | GND | PC7 | PC6 | PC5 | PC4 | +-----+-----+-----+-----+-----+ | Vcc | PC0 | PC1 | PC2 | PC3 | +-----+-----+-----+-----+-----+ OMEN Computers - - - https://github.com/osmibity - - - Page: 6...
  • Page 7 24 CLK 25 RESET -- Output signal 26 READY -- Pull it low to force a WAIT state 27 /BUSRQ /not connected on Alpha/ 28 /BUSACK /not connected on Alpha/ 29 /not connected on Alpha/ 30 /not connected on Alpha/ OMEN Computers - - - https://github.com/osmibity...
  • Page 8 OMEN ALPHA ========= OMEN Computers - - - https://github.com/osmibity - - - Page: 8...
  • Page 9 DEh – Controll Register / Status Register DFh – Data Register PPI 8255: ------- 04h – PORT A 05h – PORT B 06h – PORT C 07h – Control port OMEN Computers - - - https://github.com/osmibity - - - Page: 9...
  • Page 10 OMEN ALPHA ========= MEMORY MAP ========== 0000h – 7FFFh - EEPROM 32k 8000h – FFFFh – System RAM OMEN Computers - - - https://github.com/osmibity - - - Page: 10...
  • Page 11 ============================= MON85 Software Debug Monitor For the 8085/8080 Dunfield Development Systems ---------------------------- High quality tools for Embedded Development at low prices. http://www.dunfield.com Copyright 1979-2007 Dave Dunfield All rights reserved OMEN Computers - - - https://github.com/osmibity - - - Page: 11...

  • Page 12: Table Of Contents

    - Test for a character from the console, and return it in A if one is available. Otherwise clear A to zero. No other registers should be modified by this routine. 1.1 8085 Restart Interrupts OMEN Computers - - - https://github.com/osmibity - - - Page: 12...

  • Page 13: Breakpoints

    (see below). The default value for 'A' is 2.2 B [0-7 address] Sets one of eight breakpoints [0-7] at the specified address. Once OMEN Computers - - - https://github.com/osmibity - - - Page: 13...

  • Page 14: C

    Reads the specified 8085 I/O port, and displays the data. 2.9 L [address] Downloads code from the console port. MON85 will recognize and accept either INTEL or MOTOROLA hex format download records. The OMEN Computers - - - https://github.com/osmibity - - - Page: 14...

  • Page 15: M

    ON, they will always be displayed following every instruction that is traced). An ESCAPE charecter will cause MON85 to return to the usual command prompt (TRACE remains ON, and will resume with the next 'G' command). OMEN Computers - - - https://github.com/osmibity - - - Page: 15...

  • Page 16: U [Address]

    - Sets/Displays register contents. S ON|OFF - Enables/Disables subroutine traceing. T ON|OFF - Enables/Disables TRACE mode. U [address] - Set/Displays program base address. - Display command summary MON85 Improvements by Martin Borik: OMEN Computers - - - https://github.com/osmibity - - - Page: 16...
  • Page 17 - Added command 'H' to send out memory content in Intel HEX format. - Sending of LF and CR characters were reversed and are sent in the usual order - CR first and followed by LF. OMEN Computers - - - https://github.com/osmibity - - - Page: 17...

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