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IM2_Plus_Ack_Bug.png (761 × 363 pixels, file size: 20 KB, MIME type: image/png)
Red marker is at start of IRQ acknowledge cycle which is immediately seen by the ASIC (INTn goes up) : vector is 0x06 Purple marker is at the effective cycle where the Z80 sample the vector, and where the ASIC sees a second acknowledge. Vector is now 0x04.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:55, 30 July 2017 | | 761 × 363 (20 KB) | Gerald (Talk | contribs) | Red marker is at start of IRQ acknowledge cycle which is immediately seen by the ASIC (INTn goes up) : vector is 0x06 Purple marker is at the effective cycle where the Z80 sample the vector, and where the ASIC sees a second acknowledge. Vector is now 0... |
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