Search found 2195 matches

by exxos
Sat Jul 21, 2018 9:49 am
Forum: HARDWARE DISCUSSIONS
Topic: Just got a crazy idea 'bulb'
Replies: 12
Views: 346

Re: Just got a crazy idea 'bulb'

This actually gave me a idea with new booster (is some relevance to topic I think :lol: ) .. Problem with serial flash is max speed (quick look on mouser) is 104MHz. Now my dualtos board uses 32MHz and pushes a 55ns ROM (20MHz).. So a serial ROM would be around 8 times slower than a parallel ROM , s...
by exxos
Sat Jul 21, 2018 9:09 am
Forum: STE V1 32MHz BOOSTER
Topic: STE V1.5 32MHz BOOSTER - STATUS
Replies: 167
Views: 6736

Re: STE V1.5 32MHz BOOSTER - STATUS

Left it running over night.... So over 8 hours run time so far... 166.jpg Will see how it goes on throughout the day as "room temp" will get hotter.. I have changed some resistors on the board.. oddly in x10 mode on my probes the 40MHz goes to 6V, on x1 mode, it goes to 4V.. So I think the scope is ...
by exxos
Sat Jul 21, 2018 9:03 am
Forum: TT
Topic: TT030 C302406-001 REV H
Replies: 4
Views: 54

Re: TT030 C302406-001 REV H

Interesting.. Pins all bent on the IO ports on the YM chip.. Wire goes to "DD enable" to the 1772 by the looks of it. I will take a guess its a factory fix ? Maybe you could take out the YM chip and see if there is any tracks visible ?
by exxos
Fri Jul 20, 2018 9:37 pm
Forum: GAME ZONE
Topic: ********** Section rules **********
Replies: 0
Views: 37

********** Section rules **********

Anyone is welcome to add some game reviews and suggestions into this section, please note we expect sort of general format. Firstly, preferably a video link of the game at the top of the post. If no video can be found, then a screenshot can be used instead. It's is also useful to have a couple of ga...
by exxos
Fri Jul 20, 2018 9:35 pm
Forum: NEWS & ANNOUNCEMENTS
Topic: New Games section!
Replies: 0
Views: 56

New Games section!

I have opened up a new section for games called "GAME ZONE" and can be found at the bottom of the main forum index page. I thought this section would be useful for a lot of people, in particular new people to the scene who do not know what games to try out or are just looking for some suggestions. C...
by exxos
Fri Jul 20, 2018 8:17 pm
Forum: STE V1 32MHz BOOSTER
Topic: STE V1.5 32MHz BOOSTER - STATUS
Replies: 167
Views: 6736

Re: STE V1.5 32MHz BOOSTER - STATUS

dhedberg wrote:
Fri Jul 20, 2018 8:16 pm
The magic world of electronics! ;)
Indeed! I need a easier hobby! Then people wonder why I don't wake up one morning and slap on fast-ram, fast-tos, flash rom, ide all at once..
by exxos
Fri Jul 20, 2018 8:16 pm
Forum: HARDWARE DISCUSSIONS
Topic: Dual Tos Fast switcher...
Replies: 3
Views: 74

Re: Dual Tos Fast switcher...

Just to check does it default to 1.62 and needs the 2 pins bridging for 2.06? There isn't any "default" as such as depends which order the 2 ROM images were placed when I created the files, so can't be assumed either way. You bridge the 2 contacts to change the ROM (has to be done with power off bt...
by exxos
Fri Jul 20, 2018 7:33 pm
Forum: STE V1 32MHz BOOSTER
Topic: STE V1.5 32MHz BOOSTER - STATUS
Replies: 167
Views: 6736

Re: STE V1.5 32MHz BOOSTER - STATUS

Now I have a cap in series with the 40MHz OSC... DC offset gone.. made no difference :roll: 40_cap.png So will try increasing the DC offset as that is what is hinted in my previous scope images.. even though GAL spec wise it shouldn't work at all... Current mash up... IMG_3072.JPG 40_os.png So far i...
by exxos
Fri Jul 20, 2018 6:52 pm
Forum: STE V1 32MHz BOOSTER
Topic: STE V1.5 32MHz BOOSTER - STATUS
Replies: 167
Views: 6736

Re: STE V1.5 32MHz BOOSTER - STATUS

Freezer spray turned up :) Been spraying the 5V OSC and the min/max is about 640mV 4.00V (was 720mV 3.88V)... it run 3 full cycles, then crashed while I was trying this.. before without the spray it crashed pretty much right away.. So how it looks currently is crappy tolerances on the OSC chips :roll:
by exxos
Fri Jul 20, 2018 6:31 pm
Forum: STE V1 32MHz BOOSTER
Topic: STE V1.5 32MHz BOOSTER - STATUS
Replies: 167
Views: 6736

Re: STE V1.5 32MHz BOOSTER - STATUS

5V OSC 40_5v.png 3.3V OSC 40_3_3.png Not much between them. 5V has slightly lower DC offset. 3.88V - 0.72V = 3.16V P-P. 3.3V OSC is 4.2V - 0.92V = 3.28V P-P. Pretty much could put it down to tollerences. I do have problems with 40MHz on the CPU buffer though as the clock is going so fast (40MHz) it ...