I have 3 NEC machines. 2 of them have REX units in them with the multi bank setup. The third unit doesn't and I wanted to simulate part of the same behavior without a REX unit. Thus the question about the bank 2 enable pin somewhere on the motherboard.
Kurt On Sun, Jun 23, 2019, at 5:53 PM, Stephen Adolph wrote: > why do you want 2 REX? REX supports multi-bank. You can configure option rom > for bank 1 and bank 2 already on one REX. > > On Sun, Jun 23, 2019 at 8:11 PM Kurt McCullum <[email protected]> wrote: >> __ >> Got a question for those who know the hardware of an NEC. I've got two REX >> units in my main 8201a units. That allows me to have one rom for bank 1 and >> another for bank 2. My third unit won't get much use so I wanted to take >> another route to achieve the same thing. My plan is to replace the 27C256 >> ROM with a 27C512 with the two ROM images on it. SARDOS in the lower (Bank >> 1) 32k and UR-II in the higher (Bank 2) 32k. I know I can hook up pin 1, >> which is Address 15, to a toggle switch and it will work just fine but that >> requires an external switch to be added. Rather than that, I wanted to tie >> pin1 of the 27C512 to the Bank 2 enable pin. >> >> So the question for you hardware guys, is there an easy place on the system >> board to grab this signal? >> >> Kurt
