Search found 13 matches

by TWINKYTWONKA
Wed Nov 20, 2019 6:13 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

The only difference with my 6TIN is dataecode. mine are 1829. The weird thing is about this batch of chips is if you run memtest above 80/90mhz the memtest core just gives massive error numbers like you are trying to run a normal chip at 167mhz. I've even tried other de10's and its still the same p...
by TWINKYTWONKA
Wed Nov 20, 2019 4:39 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

Sorgelig wrote:
TWINKYTWONKA wrote:There is definately some funny business going on as the numbers on my dodgy 6tin chips also match those of the chip shown in morpheus119 post above.

can you post hires photo of this chip?


Here you go:

https://photos.app.goo.gl/dsH9mwZ7X7VAAQpe9
by TWINKYTWONKA
Wed Nov 20, 2019 3:08 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

I have just emailed them again to clarify capacitor value and positioning and once i receive any updates i will post it here Waiting for their reply. As for chips - it's weird. Looks like broken or even fake batch. May be re-marked batch of older chips. There is definately some funny business going...
by TWINKYTWONKA
Wed Nov 20, 2019 11:29 am
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

Damn... that's too bad. I was hoping for some well produced pcbs, since i screwed up an order from JLCPCB i did a couple of weeks ago. I ordered some 2.5 boards from them, using Gerber files exported by myself from Altium (because i had failed to notice the official Gerber file packages :oops: ). T...
by TWINKYTWONKA
Mon Nov 11, 2019 11:50 am
Forum: MiSTer
Topic: VGA component output is tinted pink, any ideas on how to fix it?
Replies: 29
Views: 1165

Re: VGA component output is tinted pink, any ideas on how to fix it?

sajattack wrote:Could be a poorly soldered resistor on the IO board.


its definitely this or the wrong resistor.
by TWINKYTWONKA
Sun Nov 03, 2019 7:54 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

I think this is correct and supports my own findings. Ive found that on jlpcb boards if you solder at 310 and don't drag solder you will get 100% success rate and even the 7ctn chips will test at 150mhz ( which they shouldn't i know). However, if you dwell too much and especially at higher temps th...
by TWINKYTWONKA
Sun Nov 03, 2019 9:49 am
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

The silkscreen on the jlcpcb boards is poor quality.. I think this is correct and supports my own findings. Ive found that on jlpcb boards if you solder at 310 and don't drag solder you will get 100% success rate and even the 7ctn chips will test at 150mhz ( which they shouldn't i know). However, i...
by TWINKYTWONKA
Mon Oct 21, 2019 11:15 am
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

I'd just like to add something that may help those getting low test scores on the 128mb sdram boards. The part that can really make a difference to clock speed is the quality of the soldering on the caps to the pcb. Make sure you take your time and do a really professional job and you'll get 150 mhz...
by TWINKYTWONKA
Sun Sep 08, 2019 7:22 am
Forum: MiSTer
Topic: SDRAM board
Replies: 402
Views: 130878

Re: SDRAM board

is the xd ram board compatible with 2 of the 32 mbit chips to give a cheaper 64 mbit option?

thanks
by TWINKYTWONKA
Wed May 01, 2019 7:36 am
Forum: Games - General
Topic: 720 Degrees
Replies: 6
Views: 2672

Re: 720 Degrees

I think without the rotary joystick the game just wasn't good. Trying playing it on mame to see the difference the proper control system makes to that game. I think 720 is my all time favourite arcade game and i'm still traumatized by the time when i went to my local arcade during school lunch time ...
by TWINKYTWONKA
Sat Apr 27, 2019 12:34 pm
Forum: MiSTer
Topic: Local Sellers for MiSTer Expansion Boards
Replies: 440
Views: 199254

Re: Local Sellers for MiSTer Expansion Boards

I am selling io boards rev 5.5 (£30), vertical ram (£15) and a 3d printed case (£16.45). These are available either separately or as a pack for £56.45. Postage to the uk is £3.50 for everything except the ram which is free postage. These are available on ebay (seller account : dirkthedaring71) (htt...
by TWINKYTWONKA
Sun Apr 21, 2019 9:37 am
Forum: MiSTer
Topic: Local Sellers for MiSTer Expansion Boards
Replies: 440
Views: 199254

Re: Local Sellers for MiSTer Expansion Boards

I am selling io boards rev 5.5 (£30), vertical ram (£15) and a 3d printed case (£16.45). These are available either separately or as a pack for £56.45. Postage to the uk is £3.50 for everything except the ram which is free postage. These are available on ebay (seller account : dirkthedaring71) (http...
by TWINKYTWONKA
Thu Dec 27, 2018 2:01 pm
Forum: MiSTer
Topic: Local Sellers for MiSTer Expansion Boards
Replies: 440
Views: 199254

Re: Local Sellers for MiSTer Expansion Boards

Hi, i am based in the UK and i have some horizontal outward sdram boards for sale, £18 inc delivery to the uk. They are produced using the alliance IC DRAM 256M PARALLEL 54TSOP and memory test at 160 for 30 minutes with no errors. I am also able to produce 3d printed fan mounts, cases etc on request...

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