[Coco] Kip's Single Board Computer

[camillus]

Hi salvador,

That is exactly what I thought, but it seems that even that initial address ( aka reset vector in the case of 6809) is not necessary, if I may believe to understand what Jim is saying. 

Set the pattern 0x1212 om the databus of the cpu and power and clock, and it would run.

Seems so odd tome...

cb



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On 9/8/2015 6:39:13 PM, Salvador Garcia <ssalvadorgarcia at netscape.net> wrote:
I might not understand your question, but I'll answer anyways. Most, if not all, CPUs have a hard coded initial address that is loaded upon power up. Once that happens the CPU just jumps to that address. It is the responsibility of the designer to make sure that 1) s/He knows what the initial address is and 2) there is executable code at that address, regardless whether it comes from a read only device or from a circuit that returns NOP for all address provided.


Salvador




-----Original Message-----
From: camillus
To: Steve Batson via Coco
Sent: Tue, Sep 8, 2015 6:31 pm
Subject: Re: [Coco] Kip's Single Board Computer


Sorry I was not clear in my question, I was referring to the reset vector. From
where will the cpu start if there is no defined level at 0xFFFE and 0xFFFF.

Is
there a hard coded address somewhere?



cb

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On
9/8/2015 6:15:29 PM, tim lindner wrote:
On Tue, Sep 8,
2015 at 4:11 PM, camillus wrote:
> Hi, very interesting, but where does the cpu
get the 0x1212 from?

You design a circuit to present 0x12 on the data bus for
all reads.



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