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

[John Robertson]

Not bad little utility - even I, fumble fingers, can type that into the 
9010 in a few minutes using the keyboard.

Note that the '#' symbol is the 'BELL' (looks vaguely like this thing to 
right <|>) otherwise known as 'ROM' in the Learn section for the PC script.

I couldn't figure out how to enter the delay, but it wasn't needed, the 
program worked as advertised!

Thanks!

John :-#)#

On 01/29/2015 6:19 AM, Adam Courchesne wrote:
> Here you go.  I use this script all thew time when debugging video 
> memory issues. Flood the video mem with a known value and then look at 
> the outputs when the video circuitry performs reads to see if 
> something in the datapath or RAM is sketchy.
>
> On Wed, Jan 28, 2015 at 8:30 PM, John Robertson <jrr at flippers.com 
> <mailto:jrr at flippers.com>> wrote:
>
>     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> <mailto: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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