Re: burning proms

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 13:37:19 2010