Hi! Im not usually active in the mailing list, but Ive been reading on all the cool things people have been doing. I am interested in getting one of Brian's Molex Socket Bus Taps. Let me know what you need from me to help make that happen.
-February On Tue, Jul 30, 2024, 10:23 PM Brian K. White <[email protected]> wrote: > Anyone want one of these? > https://github.com/bkw777/Molex_7880x_bus_tap > > I'm going to make one for myself and I don't mind making a few more > along the way, considering "Anyone" is probably just Steve since it > would mostly just be useful for debugging REX and REX-like things. > > The two parts are connected by an FFC cable and lets you connect a logic > analyzer to the option rom socket while something is in operation in the > socket. > > The cable is thin and you can even install the rom door cover and flip > the machine back over and use normally with the rom hanging out to the > side of the machine. > > What I want it for is, this doesn't work, but I think it's close, maybe. > > https://github.com/bkw777/REX_ATF > > > REX Classic and REX# are based on the Xilinx XCR3064XL CPLD. That part > was EOL'ed last year. > > This Microchip (ATMEL) ATF1504ASL is a very similar chip, and is still > being made and sold new. > > Extra bonus, it's a fully native 5v part, so there is no 3V3 regulator > needed and only one VCC rail to route which makes the pcb simpler. > > And I managed to reassign some pins so the jtag pins are not used for > general i/o, so programming is a lot simpler. No more aux power > connection, power cmes from the programmer, no more PORT_EN jumper and > pulldown resistor, just connect the jtag and go. > > -- > bkw >
