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Old 17 October 2011, 19:17   #1
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A500Man's Avatar
Join Date: Oct 2010
Location: Germany
Posts: 18
EPROMs too slow?

Hi there,

I own an Amiga 500 with a Kickstart 3.1 original chip. To preserve the original Chip I ordered "AMD 27C400-150" EPROMs and had the data contend of the original Kickstart-chip programmed onto a 27C400-EPROM.

Now, placing the EPROM onto my Kickstart-Switch makes no problem, it is working fine. But placing the EPROM directly into the ROM-Socket on the motherboard (Rev. 6a) results in permanent reboots / black screen. I doublechecked and veryfied; the EPROM`s content matches the Original 100%.

Well, what is that? Is the EPROM too slow? I guess not, since I heard of working EPROMs with a speed of -200. But why does it work in that Kickstart-switch (2 Kick-Sockets, one 74LS00-chip) but not stand-alone?

What could it be? Can I "heal" the problem or can I bin the EPROM? Anyone with an idea?

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