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--- blog:386_shootout_pcchips_m321 [2021/04/20 12:59] – [Further Fault Finding] john
+++ blog:386_shootout_pcchips_m321 [2021/04/28 14:53] (current) – [Configuration] john
@@ Line 202: / Line 202: @@
 {{:blog:386:img_1948.jpg?500|}}
+That says error code **03--** (BIOS checksum) ...
+I decided to reflow the solder on the BIOS socket and recheck those jumper wires I fitted at the cache sockets... just retouching each of them to make sure they were properly soldered. Then tested again:
+{{youtube>s0iVc30RQg0?large}}
+Not only that, but:
+{{:blog:386:img20210420140703.jpg?500|}} {{:blog:386:img20210420140706.jpg?500|}}
+{{:blog:386:img20210420140711.jpg?500|}} {{:blog:386:img20210420140716.jpg?500|}}
+{{:blog:386:img20210420140723.jpg?500|}}
+IT'S ALIVE, IT'S ALIVE!!! :-D
+==== Final Fixes ====
+So, it powers on, it displays stuff, and it seems that (at least) the MR BIOS ROM is working. However, there are still some issues:
+   * Keyboard doesn't work
+   * The 'cache address line' warning and lack of detected cache is a problem
+After replacing the jumper wires around the cache sockets I get a bit more progress - the "Cache address line" failure is gone, but I have an odd-sized amount of cache showing:
+{{:blog:386:img20210420203041.jpg?500|}}
+There's also an error code **1615** showing:
+{{:blog:386:img20210420203028.jpg?500|}}
+That should be:
+   * 15: Keyboard controller failure - okay, we knew about this one
+   * 16: Size and test CPU cache - that makes sense, as the detected cache is wrong
+=== Keyboard Controller Replacement ===
+Amikey-2 to be fitted.
+=== Cache Socket Trace Repairs ===
+This clearly still isn't right, so we'll need to redo these repairs from scratch.
 ===== Configuration =====
@@ Line 218: / Line 262: @@
 {{:blog:m321_v2_config_1.png?500|}} {{:blog:m321_v2_config_2.png?500|}}
+=== BIOS Images ===
+AMI BIOS
+   * {{:blog:386:3pcm001-5f03a73c30e6b255497105.zip|AMI BIOS ver. 050591}}
+   * {{:blog:386:pcchips-m321-rev2.7_2-6015e43dc9a1c900996853.zip|AMI BIOS ver. 070791}}
+   * {{:blog:386:3pcm004-5f03a7f65d0ed318049583_2_.zip|AMI BIOS ver. 060692}}
+MR BIOS (for Opti 82C391)
+   * {{ :blog:386:opti_82c391_mr_bios_v130.zip|MR BIOS v1.30}}
+   * {{ :blog:386:v020b32f.zip|MR BIOS v1.65}}
+//Note: To use the MR BIOS version you need either a MR BIOS or AMI branded __keyboard controller__ - alternatives, such as JetKey or Regional will __not__ work; the system will boot (and the keyboard __may__ work in DOS), but you will be unable to enter BIOS, change settings etc.//
 ===== 0 Wait State & Further BIOS Optimisation =====
@@ Line 304: / Line 363: @@
 ^ Test                         ^ Config 0  ^ Config 1 ^ Config 2 ^ Config 3 ^ Config 4 ^ Config 5 ^
-|Processor Speed               | 40MHz     |          |          |          |          |          |
+|Processor Speed               | 40MHz     | 40MHz    | 40MHz    | 40MHz    | 40MHz    | 40MHz    |
-|Wait states                   | 1         |          |          |          |          |          |
+|Wait states                   | 1         | 0        | 0        | 0        | 0        | 0        |
 |Norton Sysinfo CPU            |           |          |          |          |          |          |
 |Norton Sysinfo HDD            |           |          |          |          |          |          |