Re: [N8VEM: 14670] Re: SBC V2 build not working

Subject: Re: [N8VEM: 14670] Re: SBC V2 build not working

Date: Wed, 19 Sep 2012 19:08:23 +1000

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In-reply-to: <4e6d7b1a-1218-4863-8370-210dd72b500c@googlegroups.com>

References: <25B9BAB5-7169-49ED-84C2-B6450FA29599@gmail.com> <CC7ED39E.AA38%tregare@gmail.com> <4e6d7b1a-1218-4863-8370-210dd72b500c@googlegroups.com>

Maybe try this. Manually program location 0 of the flash chip with a 76 (hex). This is a HALT instruction. If the CPU is correctly accessing the chip, the CPU should halt, and the halt light will come on. It should do this every time the reset is pushed or the board is powered up

If that works maybe fill the chip with 00 (NOP) and you should see all the address lines wiggle at different rates like a binary counter as the CPU progresses through the memory space.

Cheers!

Max

On Wed, Sep 19, 2012 at 6:50 PM, opticpow <wa...@ingram.net.au> wrote:

Thanks guys, I have verified that flash back after removing it from the board. Is there any way I can confirm the CPU is reading the flash correctly?? the Flash chip is an AMD 29F040-90

Wayne.

On Wednesday, September 19, 2012 6:46:02 PM UTC+10, tregare wrote:

Yes, the genius G540 software can verify.

From: Max Scane <mjs...@gmail.com>
Reply-To: <n8...@googlegroups.com>

Date: Wednesday, September 19, 2012 1:12 AM

To: "n8...@googlegroups.com" <n8...@googlegroups.com>

Subject: Re: [N8VEM: 14667] Re: SBC V2 build not working

Does your programmer have the option to compare (verify) a bin file with the contents of the flash chip?

Maybe try to verify the contents has actually been programmed.

Max
-snip-

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