> A13 is on pin S AFAIK. Combining RAM1..3 and BLK1 with a single 4-input > AND-gate (74LS21) will give you A14. Combining this A14 with BLK2 and BLK3 > will give you the needed CS/OE signal. As you can see, in theory my solution > can be used for cartridges as well. If you don't need BLK5, then ok. If you want 24+8k expansion instead of 24+3k, you get an address clash between $2000 and $a000.. Different spec, different implementation. -Pasi -- "Narns, Humans, Centauri .. we all do what we do for the same reason: because it seems like a good idea at the time." -- G'Kar to Sakai in Babylon 5:"Mind War" - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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