GSAS 85A is a microprocessor trainer with standard features like small keypad, LED display, monitor program etc, has become popular in training and development areas probably due to its low cost. Microprocessor applications are increasing and the requirement for a more advanced microcomputer trainer with powerful system software & additional hardware started growing. GSAS 85A is a result of GSAS’s conscious effort to satisfy this requirement. GSAS 85A has most of the useful features any single board computer user wishes to have for which GSAS’s products are popular.gsas_85A

GSAS 85A is an extremely powerful microprocessor trainer based on Intel’s 8085 CPU. The system firmware provides on-board EPROM Programmer, stand-alone monitor, 2 pass assembler, disassembler and text editor. GSAS 85A is supplied with comprehensive and user friendly documentation as well as windows based communication software with on line help.

The main features of this board are:
GSAS 85A can be operated either from on – board Keypad or from a PC through USB or RS 232-C interface
Keypad and serial monitor programs support the entry of user programs, editing and relocation: debug facilities like breakpoints and single-stepping, direct port input /output and full speed execution of user programs.
On board text editor ,assembler and disassembler facility in serial mode.
User friendly windows and DOS driver software For the upload/download to/from host PC.
On board EPROM Programmer features a 28-pin ZIF socket to program all standard EPROMs, 2716 through 27512 and EEROM, 2816A.
On board Parallel Printer Port
On board Programmable Interrupt Controller 8259A.
32K bytes of CMOS static RAM with optional battery backup. Total on board memory can be expanded upto 64K bytes
Allows multi-processor system design by supporting the HOLD and HLDA signals
STD bus compatible signals available on the ribbon cable connector for easy system expansion.

Some accessories are optional, please click on the pane below for more information.

  1. Power Supply : +5V @ 3A, +12V @ 250mA, -12V @ 250mA and +30V @ 100mA
  2. Interface modules for training purpose: Keyboard, Elevator, Display, Dual DAC, 12 bit 8 Channel ADC, Logic Controller, Traffic Lights, Tone Generator , Stepper Motor , opto Isolated Input, Opto Isolated Output, Relay Output, DC Motor Interface ,TXDR ADC Interface, Latch Interface etc.,
  3. Study Cards for 8255, 8279, 8251/8253 and 8259 Peripherals.
  4. Parallel Printer cable.
  5. 3.6 V Ni-Cd Battery for power backup to RAM
  6. Study cards for 8255, 8279, 8251/8253 and 8259.
  7. RS-232C Serial Cable.


For more details and specifications please refer to our data sheet: GSAS 85A Datasheet

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