[Techtoolslist] Fluke 9010a 68000 Pod Eprom TestingonOutrun- help please !!

[Tim Matthews]

Hi Col,

I'd suggest digging out the 68k pod manual and looking at the back of  
the pod. There are details on the address prefix you use to control  
whether you're doing a byte or word read, and also user or supervisor  
mode.

I think you can ignore supervisor mode for the time being and run some  
tests using the byte and word address prefixes in user mode. Basically  
you add a byte value to the start of the address range and these codes  
determine the addressing mode of the CPU.

The 68k will trap if you try to address a non-word boundary, so the  
fluke or pod is doing a bit of magic to get single byte reads back.

I suspect your checksums are a bit dodgy either because you're reading  
every other byte, or that you're checksumming words when the tool  
expects byte input.

I promise things will become much clearer when you've correlated the  
back of the pod instructions with the manual section on addressing  
modes :) It's not just a normal pod.

Good luck,
Tim

Sent from my iPhone

On 9 Jun 2010, at 21:29, "Colin Davies"  
<colin.w.davies at btopenworld.com> wrote:


> OK... That kind of makes sense.....When I get my pod pluged into the  

> working board again (once I've fixed the header) , I'll try to do  

> some homework !!!

>

> eg.... read location 0000 in.... and see if its 16 bits and the pair  

> of 8 bits matches the first bytes of both roms :-)

>

> This A0 missing has confused me somewhat, lol !!!

>

> Cheers, Colin

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