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blog:x68_xsimm10ss [2020/08/02 11:36] – [Memory Configurations] john | blog:x68_xsimm10ss [2020/08/07 21:21] (current) – john | ||
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- | ====== X68000 - TSR XSIMM10ss Memory Expansion Board ====== | + | ====== |
- | ==== Manual Scans ==== | + | The X68000 has a 24bit address bus, which means it can address up to 16MB of RAM, however part of that address space is taken up by video memory and other memory mapped IO ranges, other than the 32bit 68030 models, all X68000 models can have up to 12MB of RAM. |
+ | |||
+ | The first 2MB of RAM is always on the motherboard; | ||
+ | |||
+ | The XSIMM6, XSIMM10 and XSIMM10ss all allow you to fit standard 30pin or 72pin SIMM modules to populate that address range between 2MB and 12MB. There' | ||
+ | |||
+ | Unfortunately, | ||
+ | |||
+ | * A pair of 30pin, 16bit SIMM sockets | ||
+ | * Two independent 32bit, 72pin SIMM sockets | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ===== Manual Scans ===== | ||
+ | |||
+ | These are the only copies of the manual I've been able to find - they are different to the XSIMM10 which does not have the 72pin sockets: | ||
{{: | {{: | ||
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Images sourced from: http:// | Images sourced from: http:// | ||
- | ==== Memory Configurations ==== | + | ===== Memory Configurations ===== |
+ | |||
+ | Because there is a mix of 30pin (16bit each) and 72pin sockets (32bit each), there is an insane number of possible configurations that you can set the board up to use. | ||
+ | |||
+ | //Note: ' | ||
+ | |||
+ | ^ Dip Switch G ^ Dip Switch A ^ DRAM Density ^ Slot A ^ Slot B ^ Slot C ^ A23-A20 ^ Memory Size ^ | ||
+ | | 0000 | 0000 | 4MBit | - | - | - | - | - | | ||
+ | | 0001 | 0001 | 4MBit | 8MB | - | - | 2 | 8MB | | ||
+ | | 0001 | 0010 | 4MBit | 8MB | - | - | 4 | 8MB | | ||
+ | | 0001 | 0011 | 4MBit | 8MB | - | - | 6 | 6MB | | ||
+ | | 0001 | 0100 | 4MBit | 8MB | - | - | 8 | 4MB | | ||
+ | | 0001 | 0101 | 4MBit | 8MB | - | - | A | 2MB | | ||
+ | | 0010 | 0001 | 4MBit | 8MB | 4/6/8MB| - | 2 | 10MB | | ||
+ | | 0011 | 0001 | 4MBit | 6MB | - | - | 2 | 6MB | | ||
+ | | 0011 | 0010 | 4MBit | 6MB | - | - | 4 | 6MB | | ||
+ | | 0011 | 0011 | 4MBit | 6MB | - | - | 6 | 6MB | | ||
+ | | 0011 | 0100 | 4MBit | 6MB | - | - | 8 | 4MB | | ||
+ | | 0011 | 0101 | 4MBit | 6MB | - | - | A | 2MB | | ||
+ | | 0100 | 0001 | 4MBit | 6MB | 4/6MB | - | 2 | 10MB | | ||
+ | | 0100 | 0010 | 4MBit | 6MB | 4/6MB | - | 4 | 8MB | | ||
+ | | 0101 | 0001 | 4MBit | 4MB | - | - | 2 | 4MB | | ||
+ | | 0101 | 0010 | 4MBit | 4MB | - | - | 4 | 4MB | | ||
+ | | 0101 | 0011 | 4MBit | 4MB | - | - | 6 | 4MB | | ||
+ | | 0101 | 0100 | 4MBit | 4MB | - | - | 8 | 4MB | | ||
+ | | 0101 | 0101 | 4MBit | 4MB | - | - | A | 2MB | | ||
+ | | 0110 | 0001 | 4MBit | 4MB | 4MB | - | 2 | 8MB | | ||
+ | | 0110 | 0010 | 4MBit | 4MB | 4MB | - | 4 | 8MB | | ||
+ | | 0110 | 0011 | 4MBit | 4MB | 4MB | - | 6 | 6MB | | ||
+ | | 0111 | 0001 | 16MBit | ||
+ | | 0111 | 0010 | 16MBit | ||
+ | | 0111 | 0011 | 16MBit | ||
+ | | 0111 | 0100 | 16MBit | ||
+ | | 0111 | 0101 | 16MBit | ||
+ | | 1000 | 0001 | 16MBit | ||
+ | | 1000 | 0010 | 16MBit | ||
+ | | 1000 | 0011 | 16MBit | ||
+ | | 1000 | 0100 | 16MBit | ||
+ | | 1000 | 0101 | 16MBit | ||
+ | | 1001 | 0001 | 16MBit | ||
+ | | 1010 | 0001 | 4MBit | - | - | 2x 4MB | 2 | 8MB | | ||
+ | | 1010 | 0010 | 4MBit | - | - | 2x 4MB | 4 | 8MB | | ||
+ | | 1010 | 0011 | 4MBit | - | - | 2x 4MB | 6 | 6MB | | ||
+ | | 1010 | 0100 | 4MBit | - | - | 2x 4MB | 8 | 4MB | | ||
+ | | 1010 | 0101 | 4MBit | - | - | 2x 4MB | A | 2MB | | ||
+ | | 1011 | 0001 | 4MBit | 4/ | ||
+ | | 1100 | 0001 | 1MBit | - | - | 2x 1MB | 2 | 2MB | | ||
+ | | 1100 | 0010 | 1MBit | - | - | 2x 1MB | 4 | 2MB | | ||
+ | | 1100 | 0011 | 1MBit | - | - | 2x 1MB | 6 | 2MB | | ||
+ | | 1100 | 0100 | 1MBit | - | - | 2x 1MB | 8 | 2MB | | ||
+ | | 1100 | 0101 | 1MBit | - | - | 2x 1MB | A | 2MB | | ||
+ | | 1101 | 0001 | 1MBit | 8MB(1) | - | 2x 1MB | 2 | 10MB | | ||
+ | | 1110 | 0001 | 1MBit | 8MB(2) | - | 2x 1MB | 2 | 10MB | | ||
+ | | 1111 | 0001 | 1MBit | 6MB | - | 2x 1MB | 2 | 8MB | | ||
+ | | 1111 | 0010 | 1MBit | 6MB | - | 2x 1MB | 4 | 8MB | | ||
+ | | 1111 | 1000 | 1MBit | 4MB | - | 2x 1MB | 2 | 6MB | | ||
+ | | 1111 | 1001 | 1MBit | 4MB | - | 2x 1MB | 4 | 6MB | | ||
+ | | 1111 | 1010 | 1MBit | 4MB | - | 2x 1MB | 6 | 6MB | | ||
+ | | 1111 | 1011 | 1MBit | 4MB | 4MB | 2x 1MB | 2 | 10MB | | ||
+ | |||
+ | There are a couple of variations of the same sizes - they are: | ||
+ | |||
+ | * (1) 4MBit DRAM density | ||
+ | * (2) 16MBit DRAM density | ||
+ | |||
+ | //Note: If you want to max out the memory capacity, by far the simplest option is to stick a single 16MB 72pin SIMM in slot A.// | ||
- | ^ Dip Switch G ^ Dip Switch A ^ Slot A ^ Slot B ^ Slot C ^ A23-A20 ^ Memory Size ^ | + | ===== SIMM Speeds ===== |
- | | 0000 | 0000 | - | - | - | - | - | | + | |
- | | 0001 | 0001 | 8MB | - | - | 2 | 8MB | | + | |
- | | 0001 | 0010 | 8MB | - | - | 4 | 8MB | | + | |
- | | 0001 | 0011 | 8MB | - | - | 6 | 6MB | | + | |
- | | 0001 | 0100 | 8MB | - | - | 8 | 4MB | | + | |
- | | 0001 | 0101 | 8MB | - | - | A | 2MB | | + | |
- | | 0010 | 0001 | 8MB | 4/6/8MB| - | 2 | 10MB | | + | |
- | | 0011 | 0001 | 6MB | - | - | 2 | 6MB | | + | |
- | | 0011 | 0010 | 6MB | - | - | 4 | 6MB | | + | |
- | | 0011 | 0011 | 6MB | - | - | 6 | 6MB | | + | |
- | | 0011 | 0100 | 6MB | - | - | 8 | 4MB | | + | |
- | | 0011 | 0101 | 6MB | - | - | A | 2MB | | + | |
- | | 0100 | 0001 | 6MB | 4/6MB | - | 2 | 10MB | | + | |
- | | 0100 | 0010 | 6MB | 4/6MB | - | 4 | 8MB | | + | |
- | | 0101 | 0001 | 4MB | - | - | 2 | 4MB | | + | |
- | | 0101 | 0010 | 4MB | - | - | 4 | 4MB | | + | |
- | | 0101 | 0011 | 4MB | - | - | 6 | 4MB | | + | |
- | | 0101 | 0100 | 4MB | - | - | 8 | 4MB | | + | |
- | | 0101 | 0101 | 4MB | - | - | A | 2MB | | + | |
- | | 0110 | 0001 | 4MB | 4MB | - | 2 | 8MB | | + | |
- | | 0110 | 0010 | 4MB | 4MB | - | 4 | 8MB | | + | |
- | | 0110 | 0011 | 4MB | 4MB | - | 6 | 6MB | | + | |
+ | 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 (which, apart from the Red Zone overclocked models, don't exist anyway). | ||
+ | ===== 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, I don't know where to obtain a copy of these files. |