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Old 30 January 2020, 08:04   #1
ahandyman59
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Kickstart Switchers compatibility with Accelerator Cards

I have been experimenting with the dual kickstart chip in ECS Amigas. It works very well in standard configurations, but if I install an accelerator board, such as an A2630 board, it fails outright, on both modes. (the dual kickstart chip enables changing between 2 kickstarts loaded on a single eprom, with a switch).

Do other kickstart switcher boards have issues with accelerators too?
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Old 30 January 2020, 08:28   #2
AmigaHope
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What firmware revision do you have on your A2630? The A2630 has a bug where its own bootrom overlaps address space of the second 256k of a kickstart -- i.e. when it was created it assumed only 256k Kickstart ROMs.

Your ROM switcher presumably responds to 512k of space even if it's only loaded with a 256k Kickstart ROM like 1.3.

Apparently this was fixed in Version 7 of the A2630 boot ROM but your mileage may vary.

If you want to burn your own ROMs it looks like you can find the images with a quick google search (don't know if I can post the link here).

Last edited by AmigaHope; 30 January 2020 at 08:35.
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Old 30 January 2020, 18:16   #3
ahandyman59
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I'll look for those roms. I have been burning my own roms since when we used serial ports on PCs to interface with the rom burners...

Thank you, much!

Last edited by ahandyman59; 30 January 2020 at 18:32.
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Old 30 January 2020, 21:09   #4
ahandyman59
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I checked the roms and confirmed that I had upgraded these roms to version 7, 2 years ago. The kickstart switcher (the one where you have 2 kickstart images on a AM27C800 eprom) works flawlessly with no accelerator in it, but won't work with an A2630 plugged in. Is there some kind of special kickstart switcher that doesn't have problems with an accelerator card?
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Old 31 January 2020, 23:15   #5
AmigaHope
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Which exact kickstart revisions do you have burned to the eprom?
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