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

[TMiller at skylinenet.net]

You don't want to loop back to "Begin" or you will reset your counter to "begin". Loop to the increment command.
Also, you want to do "yyyy+1" if you want to fill that last byte.


________________________________________
From: Techtoolslist <techtoolslist-bounces at flippers.com> on behalf of John Robertson <jrr at flippers.com>
Sent: Wednesday, January 28, 2015 8:30 PM
To: techtoolslist at flippers.com
Subject: Re: [Techtoolslist] Using the 9010 to fill a block of RAM

Hi Adam,

You can post it to the list if you wish, others may be interested...

Thanks!

John :-#)#

On 01/28/2015 5:19 PM, Adam Courchesne wrote:
>
> 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
> <mailto: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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