| ??? 12/09/05 17:28 Read: times |
#104989 - Why? you can buy a P89C668 (64k flash/8k Responding to: ???'s previous message |
No I am trying to build a System with erternal ROM/RAM. For that i am using an old 80c32 from TEMIC.
Why? you can buy a P89C668 (64k flash/8k RAM internally) for less than the 3 external chips you intend to add. i am using an old 80c32 My Problem now is: when connecting /EA to GROUND, the Oszillator stops completely after a few moments. Maybe the "old" chip is defective. Often "old" chips are "laying around" because they are bad. I have never see, or seen reported, the problem you describe. Oh, by the way are you "connecting /EA to GROUND" in the middle of running? that is "undocumented" use of the chip. Erik |
| Topic | Author | Date |
| 80c32 Problem with ALE/PSEN/EA | 01/01/70 00:00 | |
| Why? you can buy a P89C668 (64k flash/8k | 01/01/70 00:00 | |
| /EA to ground while Running | 01/01/70 00:00 | |
| Why not let him do what he wants? | 01/01/70 00:00 | |
| Nope | 01/01/70 00:00 | |
| well.. | 01/01/70 00:00 | |
| Too wise! | 01/01/70 00:00 | |
| Then be more specific. | 01/01/70 00:00 | |
| Assumptions! | 01/01/70 00:00 | |
| Newness of OP | 01/01/70 00:00 | |
| You are missing the point | 01/01/70 00:00 | |
| Answers to the point | 01/01/70 00:00 | |
| there can be | 01/01/70 00:00 | |
| Of course! | 01/01/70 00:00 | |
| re newbie and 8032 | 01/01/70 00:00 | |
| He doesn't need that ... | 01/01/70 00:00 | |
| how is he going to do the EPROM that hol | 01/01/70 00:00 | |
| That's easy, but it's not the point | 01/01/70 00:00 | |
"Why?" is that "telling him" | 01/01/70 00:00 | |
| powerdown mode | 01/01/70 00:00 | |
| That could be the Problem | 01/01/70 00:00 | |
| empty ROM? | 01/01/70 00:00 | |
| use the lower crystal value | 01/01/70 00:00 |