Subject: RE: [stella] RIOT RAM test From: Glenn Saunders <cybpunks2@xxxxxxxxxxxxx> Date: Thu, 28 Nov 2002 03:49:44 -0800 |
Okay, I just ran this puppy and here are my results:
1) 2600 heavy sixer (with channel selection switch):
Cycling power would sometimes cause the numbers to change, although the first two rows would always be:
000000000000 800080000000
Removing the power adapter was a more surefire way to get different results on power-up.
2) 2600 Jr. (long rainbow):
All 00's! Power cycled (including removing power completely) 20 times, no change.
3) 7800 (modified with Dev. OS):
Always the same results, power cycling (and removing power completely) made no difference.
first two lines:
A900AA850195 03E8EC2ADCF9
last two lines:
0230D9A9FD85 086CFCFFEA24
A 17 line display is also what I was witness to. I have several unmolested 7800s handy that I can also test on, but I don't seem to have a 7800 power supply in sight. If anyone feels that will be useful, I'll dig one up.
..Al
> -----Original Message----- > From: owner-stella@xxxxxxxxxxx [mailto:owner-stella@xxxxxxxxxxx]On > Behalf Of Matthias Domin > Sent: Tuesday, November 26, 2002 3:19 PM > To: stella@xxxxxxxxxxx > Subject: Re: [stella] RIOT RAM test > > > Hello! > > Dennis Debro schrieb: > > > > Eckhard Stolberg wrote: > > >When you do this it would be nice, if you could run a little > > >RAM test program too. I'm curious to know how random the > > >RIOT RAM really is at power-up. > > > > This is a simple program that will output the RAM values to the > screen. Of course I had to use RAM to get this done. But it does > at least give an idea of the suspected ramdomness of RAM at power > up. Nothing fancy here just your typical 6 digit display. I was > playing around with PAL/NTSC colors and scan lines so the right > difficulty switch will change from PAL (A) and NTSC (B). > > > > I've run this on 3 emulators and they seem to work fine. I'm > not doing anything illegal so it should work on the VCS as well. > The idea is to burn this to an EPROM to see what Stella outputs > at power up. > > On my Junior modell it shows always zeroes (except the $EE area were > the variables are stored). > 20 lines running in PAL: > The last two lines are (as far as i can decipher them): > 00 00 03 EC 05 00 > F7 00 F7 18 F7 60 > > Only 17 lines are visible when running in NTSC on my PAL-TV. > > Regards > -- > Matthias Domin > > Atari Lynx page: > http://home.t-online.de/home/Matthias.Domin/lynx_eng.htm > Atari Jaguar page: > http://home.t-online.de/home/Matthias.Domin/jag_eng.htm > Atari VCS 2600 page: > http://home.t-online.de/home/Matthias.Domin/vcs2600e.htm > > ------------------------------------------------------------------ > ---------------------------- > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://www.biglist.com/lists/stella/ >
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