I don't think there's a speed issue. They benchmarked the speed of the GPIO pins on a Raspberry Pi and they were able to toggle the output pins at 22 Megahertz using an optimized program written in C. See
http://codeandlife.com/2012/07/03/benchmarking-raspberry-pi-gpio-speed/ The Model T's 8085 CPU is running way slower than 22 Megahertz. I would think that there's plenty of time to read the GPIO pins, decode the address, set the data lines and flip the OE pin (or whatever else needs to be set). No? I thought there might be an electrical incompatibility (wrong voltage, can't source/sink enough current) or something else that prevented a direct hookup between the GPIO pins and the option ROM pins. C'mon... Nobody even tried this yet? Douglas On Wed, Sep 20, 2017 at 10:03 AM, John R. Hogerhuis <[email protected]> wrote: > A raspberry pi cannot simulate a ROM chip as far as I know. > > Seems like it would be a speed issue. > > You could do interface a pi to serial port though, that has been done. > > -- John >
