From: Niklas Ramsberg (niklas.ramsberg_at_swipnet.se)
Date: 2003-01-01 20:05:01
Hej allihopa! I thought I should follow Nicolas Welte's instructions on how to replace the 23128 ROMs in a flat C128 with 27C512 EPROMs. I really don't know anything about how EPROMs work (more than how to program them that is). Nicolas writes in the article: > What are the advantages? I did it because I was in the process of > changing the kernals of both the C128 and the C64 mode, and it is a > big advantage if they're in one chip. I wanted to be able to switch > between the original and the changed ones, so I used a 64k EPROM and > put it into U32. I bent the pin with A15 out of the socket and > connected a switch to it. Without the modification, I would've had to > connect the switch to both EPROMs at U32 and U35. OK, so I have to connect a switch to the pin that supplies A15 on the 27C512 (pin 1) to be able to switch in the upper 32K of the EPROM. I get that. But where shall I connect the other pole of the switch? /Niklas Ramsberg P.S. Nicolas, I've bothered you enough the last few weeks, so I thought I'd give you a break and let the other people on the list help me out here. Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.4.