Differences

This shows you the differences between two versions of the page.

--- x68000:xsimm10ss_-_memory_expansion_board [2020/08/08 18:24] – [Configuration Options] megatron-uk
+++ x68000:xsimm10ss_-_memory_expansion_board [2020/08/08 18:30] (current) – [SIMM Speeds] megatron-uk
@@ Line 85: / Line 85: @@
    * If using any 72pin SIMMS, you must have Slot A filled first
    * 30pin SIMMS must always be fitted in pairs
-   * You //can// use Slot A, or Slot C, or Slot A and Slot B, or Slot A and Slot C
+   * You //can// use the following combinations:
-   * You //cannot// use Slot B by itself, or Slot A and Slot B and Slot C, or Slot B and Slot C
+     * Slot A
+     * Slot C
+     * Slot A and Slot B
+     * Slot A and Slot C
+     * Slot A and Slot B and Slot C (but note that there are only 2 supported configurations in that mode)
+   * You //cannot// use the following combinations:
+     * Slot B
+     * Slot B and Slot C
 There are a couple of variations of the same sizes - they are:
@@ Line 98: / Line 105: @@
 ===== SIMM Speeds =====
-All standard 10MHz X68000 models can use 80ns, 70ns or 60ns chips, according to the manual, but at 16MHz, it requires 70ns or faster. There aren't any details for models clocked higher than that, so your mileage may vary if you have overclocked your CPU to speeds higher than 16MHz.
+All standard 10MHz X68000 models can use 80ns, 70ns or 60ns chips, according to the manual, but at 16MHz, it requires 70ns or faster. There aren't any details for models clocked higher than that, so your mileage may vary if you have overclocked your CPU/bus to speeds higher than 16MHz.
 ===== Software =====
 The manual also makes reference to an xsimm.x utility, but I can't quite make out what it is supposed to do - whether it tests the onboard ram or is just documentation. As it stands, we don't know where to obtain a copy of these files.