Timeline for What are the normal signals on a 65C02 in an Apple IIe?
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Sep 15, 2016 at 20:42 | history | edited | Algimantas | CC BY-SA 3.0 | Fixed typo and clarified the answerd |
| Sep 15, 2016 at 20:40 | comment | added | Algimantas | Addition: I have found high resolution photo of the board and had a look at it. Here's the part you should look at. If you have multimeter, measure resistance between contacts I marked and 5V pin on the power connector. You should measure 0Ω between 1 and 2, about 3.3kΩ between 2 and 3 and 0Ω between 3 and 5V pin. If you get these values, I would suspect dead CPU or some device pulling the NMI line low. | |
| Sep 15, 2016 at 18:24 | comment | added | Algimantas | If the resistor (SIP resistor network in this case, I guess) is not present, then yes, it won't work, so it has to be there somewhere. Was your board damaged mechanically? | |
| Sep 14, 2016 at 15:34 | comment | added | dirkt | I assume J[1-7] refers to the slots 1-7 for cards in this schematic (at least NMI should indeed be connected to pin 29 on each card slot). More importantly, in the schematic you can clearly see the pull-up resistor that holds it high during normal operation. | |
| Sep 14, 2016 at 7:15 | review | First posts | |||
| Sep 14, 2016 at 7:57 | |||||
| Sep 14, 2016 at 7:13 | history | answered | Algimantas | CC BY-SA 3.0 |