Search found 298 matches

by Atarian Computing
Sun Mar 10, 2019 8:22 am
Forum: SOFTWARE PROGRAMMING & DISCUSSION
Topic: TT Boot Logo
Replies: 11
Views: 1309

TT Boot Logo

So I was bored today and had a go at making a custom boot logo. Pretty happy with it.
newbootlogo.png
newbootlogo.png (21.37 KiB) Viewed 1016 times
Credit for this particular Fuji and Atari pixelart goes to junosix over at http://atari-forum.com/viewtopic.php?f= ... 2&#p297310
by Atarian Computing
Sun Mar 10, 2019 5:47 am
Forum: CHAT FORUM
Topic: Definitely not Atari - Driving a bit 80's retro
Replies: 6
Views: 482

Re: Definitely not Atari - Driving a bit 80's retro

Ever since watching Knight Rider as a kid, I dreamt of owning K.I.T.T. When I was 13 I found out that it was actually a 1982 Pontiac Trans Am. So that became my dream car that I swore I'd have. Turns out that as soon as I turned 18, my dad loaned me the money I needed to buy a blue 1982 Trans Am. G...
by Atarian Computing
Fri Mar 08, 2019 6:09 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 2970

Re: TT Rom access speedup

Just now I've also tested with the 1N5819 diodes. And that also works just fine. Then I removed the CF-cards so the TT would boot from floppy. Attached are the result files. Quite similar to the pictures in previous post. I've only looked at the Rom speed while I compared the before and after. The ...
by Atarian Computing
Fri Mar 08, 2019 5:57 pm
Forum: CHAT FORUM
Topic: Definitely not Atari - Driving a bit 80's retro
Replies: 6
Views: 482

Re: Definitely not Atari - Driving a bit 80's retro

Ever since watching Knight Rider as a kid, I dreamt of owning K.I.T.T. When I was 13 I found out that it was actually a 1982 Pontiac Trans Am. So that became my dream car that I swore I'd have. Turns out that as soon as I turned 18, my dad loaned me the money I needed to buy a blue 1982 Trans Am. Go...
by Atarian Computing
Fri Mar 08, 2019 3:18 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 2970

Re: TT Rom access speedup

Ok guys. It was the ROM speed. I created a new set of ThunderStorm roms on 100ns chips. Took awhile because I changed the keyboard table. Happy to announce that the speedup mod works great now! Here are some shots. This is before the mod on new chips: Before.gif This is after the mod on new chips: A...
by Atarian Computing
Fri Mar 08, 2019 10:30 am
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 2970

Re: TT Rom access speedup

In a TT with Eproms, the OE line will be jumpered to GND, so OE is not used in the selection of the Eprom. And it does need CS to work. I have been looking at the data sheet of the 1N58189 but cannot find a recovery time. That may be an important factor. I have already had the TT not booting when I...
by Atarian Computing
Fri Mar 08, 2019 9:17 am
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 2970

Re: TT Rom access speedup

Hello, I am very sorry for the mixup I caused. I confused 28 pin and 32 pin devices. So it is indeed pin 24 that's the CE for the Eprom that I used. I'll try with 1N5819 diodes, hopefully today. As for the Gembench, I took the most recent version I could find. And next I'll try without any extra pr...
by Atarian Computing
Fri Mar 08, 2019 4:03 am
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 2970

Re: TT Rom access speedup

tuxie wrote:
Thu Mar 07, 2019 10:06 pm
AtarianComputing you have great schematics where did you got it ? Did someone a redraw :shock:
Thanks :) I did. With KiCad. Bit of a wip still.
by Atarian Computing
Thu Mar 07, 2019 8:11 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 2970

Re: TT Rom access speedup

Hello Josh, The Eproms from ThunderStorm are fast enough, mine are 150nS. And 1N5819 should work, most important is the voltage drop. ( <0,8V) However, CS is pin 20 and not pin 22. Pin 22 is OE and that's permanently connected to GND trough one of the jumpers. I have not seen any slow Eproms yet. B...
by Atarian Computing
Thu Mar 07, 2019 5:15 pm
Forum: TWEAKS & FIXES
Topic: TT Rom access speedup
Replies: 32
Views: 2970

Re: TT Rom access speedup

Well I just had to give it a shot. I couldn't get it to work :( - I found 1N5819 diodes in my box of goodies. They should work, right? - I guess you meant pin 22 on the rom chips being CS? - My ROMs are of unknown speed because ThunderStorm sticker. I can peel it off though... So it just gives 2 bom...