[Techtoolslist] Using the 9010 to fill a block of RAM

[Adam Courchesne]

I have this. I'll send it to you when I get home.
On Jan 28, 2015 8:07 PM, "John Robertson" <jrr at flippers.com> wrote:

> I'm hoping one of you code jockeys knows a simple program for filling a
> block of memory on the 9010 - in this case with FFs.
>
> I'm looking for something like:
>
> *Begin at address xxxxh write FFh, **
> **
> **Increment counter by 1 store, **
> **
> **Compare counter with yyyyh - if equal goto Finish**
> **
> **Loop back to Begin**
> **
> **Finish*
>
> I think I just about wrote the program, but it would take me up to a
> couple of hours to get it to work (I'm a heck of a lot better on hardware).
>
> Why do I want this? Well, I am finding that the AnyPin device we sell is
> loaded with 00s, and the early Williams games don't seem to like that, so I
> want to load them with FFs and see if that works better. A 5101 is only 4
> bits wide, so I made a simple adapter that puts a second 5101 in parallel
> (address and selects) with the original and the four additional data lines
> (D4 - D7) go to a Glomper clip that fits over a handy ROM to get those
> connections. Now I can test the 5101 in the game using the standard built
> in RAM tests.
>
> Thanks!
>
> John :-#)#
>
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