Re: burning proms

Just re-read 24 pin.. Ugh. Ok, well buying 1 expensive chip vs. 7 is much
better.

Kevin

On Mon, Mar 8, 2010 at 12:37 PM, Kevin Moore <talon.k@gmail.com> wrote:

> Success, Barring my ignorance on the 74s288 chips. The 93446 worked for the
> 74s287 chip perfect.
>
> I copied the original, and just burned it straight up without doubling the
> image size using the copy command, and it worked.
>
> Now to get my hands on some 93448 chips to see if they work the same for
> the 74a288.
>
> Very nice, now I might just be able to get these other 3 Tempests up and
> running soon.
>
> Thanks for the education.
>
> Kevin
>
>
>
> On Mon, Mar 8, 2010 at 12:18 PM, Kevin Moore <talon.k@gmail.com> wrote:
>
>> No there is no link, just some ramblings from a couple of people who think
>> it might work.
>>
>> I bet that's why my first go round didn't work, I was trying to use the
>> 288 to test from.
>>
>> Let me try the 287.
>>
>> The TI, and National 287, and 288 read the same. But it looks like I've
>> got TI parts on the boards I have. I've used National in the past. Both are
>> pricey.
>>
>> Let me give the 287 image a whirl and see what happens.
>>
>> Kevin
>>
>>
>>
>> On Mon, Mar 8, 2010 at 12:14 PM, Mark Shostak <shostakmark@gmail.com>wrote:
>>
>>> Kevin,
>>>
>>> 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,
>>>
>>>
>>> Again, do you have a link or thread?
>>>
>>>
>>> Was that a TI or Nat'l 74S287? ;-)
>>>
>>> A 74S287 could be replaced by a 93446 in the manner you described, in
>>> some applications. Fortunately, that would include most vector applications
>>> (excluding Sega Spaceship).
>>>
>>> A 74S288 is a completely different organization (i.e. x8), and does not
>>> have the pins you described below. If you wanted to use a Fairchild part in
>>> place of a '288, you'd need a 93448, which is in a 24 pin package, so you'd
>>> have to "force it to fit and paint it to match", but it would work.
>>>
>>> -Mark
>>>
>>>
>>>
>>>> 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 13:41:46 2010