yah, thx. I think it needs to be buzzed out a bit to confirm the actual pinout...
On Sun, Feb 19, 2017 at 12:20 PM, Kurt McCullum <kurt.mccul...@att.net> wrote: > Steve, > > Keep in mind that I am guessing on the PROM based on the limited number of > 128k 28 pin PROMs available at that time. That's a pinout for the NEC PROM > but I don't know if that is the actual part which was used. There should be a > number on the chip that may lead to the answer. > > Kurt > > -----Original Message----- > From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of Stephen > Adolph > Sent: Sunday, February 19, 2017 5:13 AM > To: Model 100 Discussion <m100@lists.bitchin100.com> > Subject: Re: [M100] Parts for an NEC PC-8300 > > .. comparing a 27C1001 pinout to the one from Kurt, it looks like it may just > be possible to stuff a 27C1001 and wire up only a couple of signals. > > > On Sat, Feb 18, 2017 at 8:12 PM, Stephen Adolph <twospru...@gmail.com> wrote: >> come to think of it, you could probably tie /CE and /OE together. >> >> On Sat, Feb 18, 2017 at 8:08 PM, Stephen Adolph <twospru...@gmail.com> wrote: >>> I did not grasp how much information is in that 500MB tech reference >>> doc for the 8300. Wow! >>> >>> probably the best documented Model T. >>> >>> It is clear that the ROM is 128KB, and I think it is also clear that >>> without some custom solution, one can't make a replacement main rom >>> for the 8300 easily. At best you might be able to program a 27C1001, >>> and then do a custom adapter board. >>> >>> A normal eeprom needs both a chip select and an output enable, so >>> some extra logic might be needed too. >
