Suspect kick rom dead A600

[alexh]

I've already answered this in another forum.

KS1.3 = 256Kbytes
KS2+ = 512Kbytes

If a KS2+ ROM can be read correctly on the EPROM programmer but doesn't work in your A600 it probably means address line 19 is broken between the ROM socket and the CPU.

_OR_

If a particular EPROM has _NEVER_ worked it could mean that the EPROM is too slow.

Does KS2.05 work if you put it back in the kickstart switcher?

[alexh]

OR

The RAM upgrade is made / fitted incorrectly and is interfering with the CPU it sits on.

http://wiki.classicamiga.com/Amiga_boot_error_code_colours

[alexh]

Pin 48



http://www.symbolengine.com/index.php/2007/05/14/amiga-600-schematics-in-pdf-format/

[alexh]

Ah, perhaps I had the wrong pin, i assumed it was byte addressing. Perhaps it is word addressing.

In that case it would be pin 17?

[alexh]

Sorry, but I'll have to leave it to you to work out which pin on the 68000 maps to the upper address bit of a 512Kbyte ROM.

[alexh]

You're not reading the schematic diagrams correctly.

You are confusing function numbering (e.g. A17) with pin numbering (pin 17).

[alexh]

If it used to work in the kickstart switcher. Take out the RAM and put the switcher back in and see if it still works?

If the ROM is broken then it shouldn't work.

[alexh]

You need 27C800 for dual kickstart on A600.

One 27C400 chip has a capacity of 512Kbytes which is 100% used with Kickstart 3.1 40.63 which is 512Kbytes.