On 11/24/2012 11:10 PM, silverdr@wfmh.org.pl wrote: > > On 2012-11-24, at 15:46, Gerrit Heitsch wrote: > >> We really have to regenerate _KERNAL from !(!A14 & !CS-ROM) which is >> >> >> |\ >> A14 ----------| \ |\ >> |\ | )----| )O-- _KERNAL >> _K/B ------| )O----| / |/ >> |/ |/ >> >> Once we have that, the old circuit and ROM layout can be used again. Since you use a 74LS08, we have enough AND gates, the only thing missing is 2 Inverters: >> >> +5V >> | >> | | 4.7K? >> | | >> | >> *----------------- out >> | >> In ___ |/ >> ----|___|----| >> |\ >> v >> | >> | >> --- >> GND > > http://dl.dropbox.com/u/58002657/cbm/c64/rom_adapter_narrow2.png > > Now, laying this out is going to be another challenge.. May force me to use SMDs as I guess I won't be able to keep the previous size with THDs. > 10K might be a bit much for R3 and R4 since we're working with dynamic signals now. For the first try, keep them easy to change. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-11-25 07:00:18
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