MacPeak Systems, Spyglass, Austin, Texas originally sold these cards for the SE as Orion accelerators (from about 1988 onwards). They were about $800. They then discontinued (or renamed) the Orion and sold the next version as the Irwin accelerator. Owners of the Orion could upgrade to the Irwin relatively cheaply for about $300. I suspect both the Orion and the Irwin had associated (but distinct) utilities diskettes (3.5" 800K). I definitely still have the Irwin utilities disk, but I am not sure about whether I still have the Orion utilities disk. I also think I have the Irwin utilities programme file (something like a Control Panel device ?) on a Mac CD-ROM I had made (at some expense, by a bureau, back in about 1999). All that gear is in Australia, and I am in Denmark, but I should return to Australia in mid-November - if you want to follow this up.
With the Irwin utilities (but not the Orion utilities ?? unsure) you could adjust the setting for RAM speed, eg. 65ns 80ns 100ns etc, you could also adjust the processor and co-processor speed settings, eg 25Mhz, 20Mhz, 16Mhz, 8Mhz, you could also adjust the (processor) cache size, or turn off the (processor) cache entirely. Some application software needed the cache disabled for that software to work.
There is also at least an Irwin users manual (which I should still have ?), and almost certainly an Orion installation manual.
Beware though the standard power supply in a Mac SE is 100 Watts, and installing an accelerator in an SE increases power consumption, and that can reduce the life expectancy of the power supply. I think Apple and other firms made a special heavy duty replacement SE power supply, maybe 120 or 125 Watts ? These beefed up power supplies are probably quite scarce...
Donald
With the Irwin utilities (but not the Orion utilities ?? unsure) you could adjust the setting for RAM speed, eg. 65ns 80ns 100ns etc, you could also adjust the processor and co-processor speed settings, eg 25Mhz, 20Mhz, 16Mhz, 8Mhz, you could also adjust the (processor) cache size, or turn off the (processor) cache entirely. Some application software needed the cache disabled for that software to work.
There is also at least an Irwin users manual (which I should still have ?), and almost certainly an Orion installation manual.
Beware though the standard power supply in a Mac SE is 100 Watts, and installing an accelerator in an SE increases power consumption, and that can reduce the life expectancy of the power supply. I think Apple and other firms made a special heavy duty replacement SE power supply, maybe 120 or 125 Watts ? These beefed up power supplies are probably quite scarce...
Donald