Bil Herd wrote: > My apologies for that, habit from the old days. > > So I jumped in without really knowing the application or what the challenges > were, I assumed it was a "how to connect to something inside of something" > type problem if you were to replace an internal eprom with a reprogrammable > part and didn't want wires snaking out through the vent holes. > > What kind of app is this targeting? Cartridge, C64, or damm near anything? > Is it a matter of getting hold of the R/W line and the host can participate > in the reprogramming? > > Can the host be put into tristate reliably and something grab the buses, for > example a 24 bit shift register driven by 2/3 wire? (Let the programmer do > all of the magic byte stuff, the adapter just s/p translates). Twice the > pins if you have to mux. > > I assume that anything that adds price at all is out of the range, you'd be > looking a pin count for the address and data lines at a minimum price, > whether done with TTLish shift registers or PAL/PGA/uProc. There's quite a lot of SPI flash, although I don't see why he needs high capacity or clock rate to support the replacement ROM application. http://www.winbond-usa.com/en/content/view/290/553/ Flash is a pretty easy state machine and x8 parts mean you could probably do it with 2 shift registers. I haven't thought of the fewest-parts approach though. > Too bad there isn't an AVR type with 512k flash. you think your talking to a > mem, your really talking to a proc. The ST Micro STM32 series has up to 512k flash but is expensive compared to flash alone. http://www.st.com/mcu/inchtml-pages-stm32.html -- Nate Message was sent through the cbm-hackers mailing listReceived on 2009-05-04 01:26:50
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