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x68000:xsimm10ss_-_memory_expansion_board [2020/08/08 18:13] – [Manual Scans] megatron-ukx68000:xsimm10ss_-_memory_expansion_board [2020/08/08 18:30] (current) – [SIMM Speeds] megatron-uk
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 Unfortunately, information on the later XSIMM10ss is rather thin on the ground - which is a shame as it has the most flexibility of all the models: Unfortunately, information on the later XSIMM10ss is rather thin on the ground - which is a shame as it has the most flexibility of all the models:
  
-   A pair of 30pin, 16bit SIMM sockets +   Two independent 72pin SIMM sockets (Slots A and B) 
-   Two independent 32bit, 72pin SIMM sockets+   A pair of 30pin SIMM sockets (Slot C) 
  
 {{:x68000:img_1200.jpg?400|}} {{:x68000:img_1200.jpg?400|}}
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 ==== Configuration Options ==== ==== Configuration Options ====
 +
 +Because the manual is difficult to make out, I have transcribed all of the configuration options into the table below.
  
 //Note: 'Memory Size' in the below table refers to the expansion memory size, not the entire system memory size.// //Note: 'Memory Size' in the below table refers to the expansion memory size, not the entire system memory size.//
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 | 1111         | 1010         | 1MBit        | 4MB    | -      | 2x 1MB | 6       | 6MB          | 1111         | 1010         | 1MBit        | 4MB    | -      | 2x 1MB | 6       | 6MB         
 | 1111         | 1011         | 1MBit        | 4MB    | 4MB    | 2x 1MB | 2       | 10MB        |  | 1111         | 1011         | 1MBit        | 4MB    | 4MB    | 2x 1MB | 2       | 10MB        | 
 +
 +You can see a few restrictions on the options:
 +
 +   * If using any 72pin SIMMS, you must have Slot A filled first
 +   * 30pin SIMMS must always be fitted in pairs
 +   * You //can// use the following combinations:
 +     * 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: There are a couple of variations of the same sizes - they are:
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 ===== SIMM Speeds ===== ===== 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 ===== ===== 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. 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.
x68000/xsimm10ss_-_memory_expansion_board.1596874399.txt.gz · Last modified: 2020/08/08 18:13 by megatron-uk