Trainer is a powerful and cost-effective complete single-board microprocessor based on the Motorola 68000 CPU supported by the popular peripheral chips from Motorola. The powerful system monitor includes one-line assembler for mnemonic entry, disassembler and Centronics printer interface driver in addition (0 the user friendly set of debug monitor commands. ABORT facility permits graceful recovery, preserving the complete user context, from "STUCK" programs. It is supported by a wide verity of interface modules making it an extremely useful educational aid. Careful bus arbitration design permits the access of all on-board resources by an off-board master making it easy to expand It into a multi-master configuration. Thus It is a valuable aid for teaching, software and hardware development in academic institutions, research institutions and R&D labs.

Main Features

1. Operates on single +5V power supply with a PC compatible system through its RS 232 C serial communication interface.
2. Powerful system monitor permits entry of programs, debugging through breakpoint, trace and instruction step facilities.
3. Hardware debugging through Read loop, Write loop and Test memory commands.
4. Built-in one line assembler and disassembler.
5. Centronics printer Driver included in the monitor Program.
6. Interfacing with PC compatibles, with file upload / download capability.
7. Provision for multi-master design expansion.
8. ABORT facility to recover gracefully from "STUCK" programs.
9. Flexible and powerful interrupt system.
10. Supported by a variety of interface modules.

Accessories (optional)
* Interface Modules: Keyboard, Elevator, Display, ADC using DAC, Dual Slope ADC, Dual DAC, Logic Controller, Traffic Lights, RTC, 18 Column Numeric Printer etc.,
* 68020 / 68881 upgrade: A plug in replacement for 68000 processor which allows all the advanced features of the 68020 and 68681.
* Centronics printer interface cable.
* SO core ribbon cable connector set.

CPU : 68000 at 8 MHZ

M EMORY

• ROM : Four JEDEC compatible 28 pin sockels provide. 128K Bytes using 4 X 27256 256K Bytes using 4 X 27512 System firmware is supplied in 2 X 27256. Rest is for user expansion.
• RAM : Four 28-pin sockets Logive 128K bytes using 4 X 62256. 64K Bytes supplied using 2 X 62256. Reset is for user expansion 

Peripherals:

• 68681 Dual UART : To provide two RS-232C Ports 8 output lines, counter timer etc. 
• 68230 Parallel Interface I Timer: To provide 16 I/O lines, 8 user defined lines and 24 bit counter timer with 5 bit (+32) prescaller.

Interrupts:

• On-board interrupt priority encoder, On-board autovector generation. Complete flexibility in selecting on-board / off-board interrupt sources. Level 7 interrupt is dedicated for implementing ABORT function.

Bus

• Buffered TTL Compatible bus signals brought out to Spectra Strip type 50 pin ribbon cable connector for easy expansion. Bus arbitration signals available on connector. Provision for accesing on-board resources by off board Master.

Interface Signals

• Parallel 110 : 24 lines of TTL compatible signals brought out to Spectra Strip type 26 pin ribbon cable connectors.
• Serial 110: Two RS 232 C ports with standard MODEM control signals through on-baord 9 pin D-type connectors.

Scope of Supply

1. 68K-2 Trainer
2. XT68K2 Driver Software
3. RS-232C cables set.
4. User's Manual

Specifications:

• Central Processor
  • 8031 / 8051 @ 11.0592 Mhz
• Memory
  • Four 28 pin JEDEC sockets provide
  • Following memory configuration
• Program Memory
  • ROM : 32K bytes of system firmware using 27256.
  • RAM : 32K bytes using 62256.
• Data Memory
  • Ram : 64K bytes using 62256 (32K X2). Upper
  • Most 8K bu\ytes are reserved for I/O Addressing and I/O expansion.
• Peripherals
  • 8155 : Static HMOS 256 bytes RAM with I/O Ports and timer .
  • RAM reserved for monitor 1 4 b i t t ime r i s available for user and port lines are used for DAC and ADC
  • 8255 : PPI three nos. Two nos. Are for user, one supplied; another for user expansion. The remaining one is used parallel printer and optional LCD.
  • 8253 : Programmable interval timer. Three 16 bit programmable timers available for user.
  • 2681 : Dual channel UART for serial, RS-232-C & RS-485 communication supporting all standard bauds from 110 to 19200.
  • 8042 : Universal Peripheral Interface used to interface PC keyboard in stand-alone mode
  • ADC 1674 : 12 bit ADC, 10ms (optional)
  • DAC 0800 : 8 bit DAC
  • Interrupts External : INTO is used for implementing single stepping, brcakpoints and user’s BREAK switch. INT1 is available to user
  • Internal : On chip timer and serial interrupts are available to user
• Interface Signals
  • Bus : STD bus compatible bus signal available through a 50 pin ribbon cable connector.
  • Single chip Mode : MCU port lines available through a 50 pin ribbon cable connector.
  • Parallel I/O : 48 TTL compatible Lines (2 X 8255) brough out through two 26 pin ribbon cable connectors.
  • Serial I/O :
    • RS-232-C through on-board 9 Pin D-type female connector.
    • RS 485 through on-board 9 pin D-type male connector.
    • Optional on chip serial port adaptor for extra RS-232-C Port
  • Printer : PC compatible parallel printer interface available on a 25 pin D type female connector.
  • Timer Signals : Four Timers, Three 8253 and one from 8155 are available at the 50 pin ribbon cable connectors
  • Analog Signals : 8 analog inputs for ADC are fed through on-board terminal blocks DAC output is available through a test point
• General:
  • Power Supply : + 5V @ 1.6A (max)
  • Requirement : ± 12V @ 100mA (max) for ADC andDAC

Housed in ABS plastic moulded cabinet
Scope of Supply

1. ESA 51 Trainer
2. User’s Manual
3. 8051 Reference Card
4. RS-232-C cable
5. Windows / DOS / Linux Driver Software CD