The venerable i8035 has been available since the 1970s, predates the somewhat more popular i8051 processor, and though still available through grey-market, is getting harder to find. The i8035 retrofit module will plug directly into an 8035 processor footprint, permitting a skilled programmer to regenerate the application for the PIC processor. The programming header will permit interfacing to a PC via the Microchip ICD2, allowing USB connectivity and live in-system debugging. With minimal expense, the new application can be developed, and any existing installations can continue to use the existing original application hardware.

The unit has the following feature set:

• PIC16F877A processor, though in production any PIC in a 44-pin TQFP package may be substituted per customer requirement.
• 20MHz operating frequency, though as above, any crystal (<20MHz) may be substituted in modest production runs.
• Pull-up resistors to simulate the intel style of output driver (either driven low or converted to input with internal pull-up).
• Programming header to permit connection to an ICD2 or other in-circuit programmer.
• Available pre-programmed with your application as required.
• Intel 8035 processor footprint.
• 5V operating voltage.
• 2.1"x0.9" overall dimensions.

Please note, this is not a drop-in replacement for an 8035 processor. Code must be written to emulate the original application. This code can be written either in assembly language or C. For more information on compilers, please visit the Microchip web site. ROM or EPROM on the existing hardware can be either left in place, or removed. The external memory used by the 8035 isn't used by the PIC. Also note that when dropping this unit onto existing hardware, the crystal or clock source of the original hardware is not used. The processor operates off of a local crystal on the module.

For in-system code development, an in-circuit debugger or emulator may be used. The Microchip ICD2 will connect directly to the module, however due to space limitations on the module itself, a custom header has been used. As a result, a custom programming cable is required, also available from J-Tech.

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