| 1 | # Overview # |
| 2 | |
| 3 | A collection of tips for working with KDJ11 CPU boards. |
| 4 | |
| 5 | # Failed Tests # |
| 6 | |
| 7 | The KDJ11-B includes a variety of diagnostics in ROM that run on boot. When a |
| 8 | test fails, there is a hidden option to bypass the test and continue. Simply |
| 9 | press `Ctrl-O` (the letter, not the number zero), then `4`, then `ENTER`. This |
| 10 | will continue on, halting at the next failed test or at the boot menu. |
| 11 | |
| 12 | # J11 ODT & Cache # |
| 13 | |
| 14 | When a KDJ11 with cache powers up, the cache is enabled by default, even in |
| 15 | ODT mode. Thus, even if a memory location is faulty, writing and reading to |
| 16 | that location will appear to succeed. |
| 17 | |
| 18 | The cache may be bypassed by setting bit nine of the Cache Control Register |
| 19 | (CCR) located at `017777746`. In ODT: |
| 20 | |
| 21 | 17777746/ 01000 |
| 22 | |