| ??? 11/26/04 01:13 Read: times |
#81968 - Headaches or not... Responding to: ???'s previous message |
José said:
The idea was not mine, was taken from elecktor magazine from an expansion board for the '52 system. It's a bit critical. It all depends on whether logical high state of /WR or /RD line is provided by strong active pull-up or not. I could imagine that some faster '52 derivatives have the strong pull-ups permanently activated (I mean the use of standard push-pull configuration). Then the direct connection of /WR and /RD line will result in destruction! I would not proceed without an additional gate. Directly connecting both lines would cause some headaches... Kai |
| Topic | Author | Date |
| Regarding RD and RW pins | 01/01/70 00:00 | |
| Funeral Ceremony | 01/01/70 00:00 | |
| AND gate | 01/01/70 00:00 | |
| ...or roll your own AND gate | 01/01/70 00:00 | |
| Roll your own | 01/01/70 00:00 | |
| Why roll your own? | 01/01/70 00:00 | |
| why? | 01/01/70 00:00 | |
| the reason | 01/01/70 00:00 | |
| 74155 | 01/01/70 00:00 | |
| The micro may not burn | 01/01/70 00:00 | |
| Do Not Use The Diodes Scheme | 01/01/70 00:00 | |
| With Schottkys either... | 01/01/70 00:00 | |
No need | 01/01/70 00:00 | |
| Other use... and othe configuration | 01/01/70 00:00 | |
| Headaches or not... | 01/01/70 00:00 | |
| derivative depended | 01/01/70 00:00 | |
| Don't worry i used a gate.. | 01/01/70 00:00 |