Re: burning proms

I'll give that a whirl and see what happens.

I'm trying to burn some Tempest Aux board proms 74s287 and 288 using these,
as a cheaper alternative to paying nearly $7 a chip for 288, and 287's.

As for the SD well I'm still dead in the water.

I downloaded some test proms from Xray2, but as of yet I haven't been able
to get them to work. The VGO command has been stripped so it's basically
makes the game play blind.

Anyone know if you can just pull the vgo pin like you do the DMAGO line on
asteroids?

Kevin

On Mon, Mar 8, 2010 at 10:05 AM, Mark Shostak <shostakmark@gmail.com> wrote:

> Kevin,
>
> Do you have a link to a specific set of instructions or thread we could
> look at?
>
> -Mark
> P.S. How's your SD coming?
>
>
> On Mon, Mar 8, 2010 at 8:51 AM, Kevin Moore <talon.k@gmail.com> wrote:
>
>> It's been suggested that you can use 93446 proms in place of the 74s287
>> and 74s288, by burning the bin on the bottom half of the prom. Since pins 13
>> and 14 of a 74s28x are grounded, you would have no need for the CS, and A8
>> lines on the 93446.
>>
>> Since I'm still pretty new at burning stuff I thought I would inquire as
>> to how to do this.
>>
>> I'm using a Data I/O to burn this stuff.
>>
>> My first attempt didn't work.
>>
>> I read the 74s288 into memory, checksum was good. I then burned the buffer
>> onto the 93446 and tried it. No joy.
>>
>> So I'm hoping someone smarter than myself can teach me the mystical ways
>> of doing this, as the 93446 chips are cheap, and readily available.
>>
>>
>> Thanks,
>>
>> Kevin
>>
>>
>

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Received on Mon Mar 8 12:34:50 2010