| ??? 09/29/05 15:29 Read: times |
#101728 - caqll a spade a spade Responding to: ???'s previous message |
I have tried AND'ing PSEN and RD to enable the '245 for proper read of all external read's but the system does not boot.
AND is in fact OR for negative logic. Then WHY NOT call it a negative OR? the ONLY totally sure way to screw up everybodys brains is to call a spade a fork. Yes, I know "it is the same gate", but just see what happened when Rob read your misnamed chip. a negative OR is NOT an AND function there is no such signal as EA on ANY '51 derivative Erik |
| Topic | Author | Date |
| Buffering address/data bus Basic-52 | 01/01/70 00:00 | |
| direction | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| '573? | 01/01/70 00:00 | |
| 245 | 01/01/70 00:00 | |
| Only need one latch | 01/01/70 00:00 | |
| Re-read this... | 01/01/70 00:00 | |
| negative logic | 01/01/70 00:00 | |
| caqll a spade a spade | 01/01/70 00:00 | |
| Ok... I follow you, but... | 01/01/70 00:00 | |
| 74F623 instead of 74F245 | 01/01/70 00:00 | |
| I'd stick with a 245 | 01/01/70 00:00 | |
74AC623 is also fast | 01/01/70 00:00 | |
| A little clarification | 01/01/70 00:00 | |
| if you are ANDing them it will never wor | 01/01/70 00:00 | |
| How fast is your memory? | 01/01/70 00:00 |