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This design of ISP programmer AVR910 was based on specification from Atmel (AVR910). The programmer is based on processor AT90S2313-10, quartz 4MHz, load ver3.8b. The main component of the original programmer is AT90S1200 and it was connected to port COM, but it is better to use port USB and module prolific PL2303, as in this construction. USB port was separated from the processor by means of optocoupler PC123 on ports TX/RX. The processor is powered from the source of ISP connection, the whole connects with the speed of 19200 (such a speed is allowed by the quartz used).
Everything was closed in a housing of a broken WiFi module. The programmer works with software of AVRStudio 4.18 – avrprog.
The programmer during operation:
Link to original thread (useful attachment) - Programator AVR910 USB Prolific PL2303 Opto-Izolacja