Search found 5969 matches

by exxos
Wed Jun 19, 2019 9:56 am
Forum: ST 16MHz V2.X SERIES BOOSTERS
Topic: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)
Replies: 437
Views: 37091

Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

4.7K crashed after 16 passes. I will test 4.7K again now (from cold) to see what happens. Its possible 4.7K isn't enough, or could have just been a fluke it died at 16 as it was warmed up anyway. It seems to crash around 20 passes (about 100mins run time) but reset and its off again for another 20 p...
by exxos
Tue Jun 18, 2019 10:29 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 295
Views: 8199

Re: exxos blog - random goings on

PhilC wrote:
Tue Jun 18, 2019 10:26 pm
Another thought, angled simm socket be any easier?
Simm is DRAM.. I need SRAM.
by exxos
Tue Jun 18, 2019 10:28 pm
Forum: ST 16MHz V2.X SERIES BOOSTERS
Topic: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)
Replies: 437
Views: 37091

Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Yep.

10K's in... pretty much as expected.. Can't find 4.7K at the moment :(

IMG_4386.JPG
IMG_4386.JPG (101.99 KiB) Viewed 30 times

EDIT:

Found 4.7K.. so will leave it on for a bit before exxos powers down for the day.
by exxos
Tue Jun 18, 2019 10:22 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 295
Views: 8199

Re: exxos blog - random goings on

PhilC wrote:
Tue Jun 18, 2019 10:10 pm
Fire UP the quatro! In reality, there is plenty of space in an STFM case, to be able to use a board similar to the quattro or a relocate board.

Yeah, I been thinking the quatro would be useful for this, I mean its only proof testing after all.
by exxos
Tue Jun 18, 2019 10:21 pm
Forum: ST 16MHz V2.X SERIES BOOSTERS
Topic: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)
Replies: 437
Views: 37091

Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

I think I have 2.2K resistors on this motherboard (I put them in sockets thankfully so can change them easy)... I mean 2.2K with 23 address lines , 16 datalines.. 39 pins.. 2.2K @ 5V = 0.0023A x 39 = 0.0897A. So with some other pins might as well round up to 100mA. 0.1A x 5v = 0.5watts. But of cours...
by exxos
Tue Jun 18, 2019 10:20 pm
Forum: ST 16MHz V2.X SERIES BOOSTERS
Topic: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)
Replies: 437
Views: 37091

Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

PhilC wrote:
Tue Jun 18, 2019 10:07 pm
Sorry, I've forgotten by what was the original speed of the CPU but regardless of speed, it's an achievement to make any stable kind of increase on a chip as old as a 68000.
Original was 8MHz... The SEC has pretty much always run at 50MHz. The SEC itself says 20MHz on it.
by exxos
Tue Jun 18, 2019 9:56 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 295
Views: 8199

Re: exxos blog - random goings on

I keep thinking about a alt-ram card.. I did add it to a SEC design, but each time I do a new board, I would have to solder more stuff , larger boards, more parts.. it just gets annoying so alt-ram never gets done. I just un-forgot I designed this a while back... fr.jpg The header would be to branch...
by exxos
Tue Jun 18, 2019 9:07 pm
Forum: ST 16MHz V2.X SERIES BOOSTERS
Topic: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)
Replies: 437
Views: 37091

Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

I have been running the SEC at 50MHz as much as possible the past days.. it seems to get around 25 passes then 2 bombs to desktop. I've repeated this a few times now. I think the SEC is overheating after a while. Oddly the 50MHz osc is getting rather hot as well. So earlier I put in a 40MHz osc (doe...
by exxos
Tue Jun 18, 2019 6:05 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 295
Views: 8199

Re: exxos blog - random goings on

V3 PCB. Pots gone, resistors added. Also had to fix the audio connector holes (tiny bit to small :roll: )

v3.png
v3.png (21.04 KiB) Viewed 28 times
by exxos
Tue Jun 18, 2019 6:03 pm
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 295
Views: 8199

Re: exxos blog - random goings on

PhilC wrote:
Tue Jun 18, 2019 5:50 pm
And theres always the brightness adjustment on the monitor which is what I used when coming up with the values I sent you.
Yeah, I've got mine at 100% and its fine, but I still think it should be brighter, but could just be my crappy monitor.