Search found 24 matches

by TWINKYTWONKA
Thu Dec 05, 2019 9:56 am
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

Concerning testing of the 128MB SDRAM modules, the older versions of the memory test application I do not think even test the full 128MB of memory, so are ineffective as a test. The older versions certainly offer less accurate testing and reporting of errors with 32MB modules when I have tested the...
by TWINKYTWONKA
Sat Nov 30, 2019 7:51 am
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

JimDrew wrote:I have 1822 date code chips from Digikey and they work fine. My mass produced boards have a 1844 date code.


on the reverse of the chip do they Taiwan written in one of the recessed discs?
by TWINKYTWONKA
Tue Nov 26, 2019 5:17 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

This batch is defective DATECODE 1822, Mouser did not want to return even they told me that that datecode they do not have in their warehouse and that they had not supplied it. At the end of several days I threatened with legal channels and finally the amount has been refunded (40 memorys, 525€) Be...
by TWINKYTWONKA
Mon Nov 25, 2019 9:38 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

FYI and FWIW, I purchased my 6TIN ICs from Mouser in the US in September and had no issue. The date code is different, but I had zero issues with the very few 128s I built. ++IMG_0070ss2.JPG I've purchased numerous batches of these chips from mouser before so its not that all batches are bad but th...
by TWINKYTWONKA
Mon Nov 25, 2019 8:36 am
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

Highest i got the 128MB board running was 80mhz and they are from the same fake batch according to pic. It's better not to buy 6TIN from Mouser! 7TIN/7TCN work well. You don't have to stick to 6TIN. Excellent point and one that should be on the front page in very large letters. There are now three ...
by TWINKYTWONKA
Sun Nov 24, 2019 10:32 am
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

https://drive.google.com/open?id=1d2txd ... v5cRjfPPzM Your 6TIN looks the same as WINBOND chip if judge by case caveats. I think the one who re-marked the chips thought there is no difference as long as chip is 64MB.. But for MiSTer it really makes the difference. I think the fact that a massive s...
by TWINKYTWONKA
Sun Nov 24, 2019 9:01 am
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

I have attached a couple of pictures from a batch I have. Front: https://misterfpga.co.uk/wp-content/uploads/2019/11/6tin-front.jpg Rear: https://misterfpga.co.uk/wp-content/uploads/2019/11/6tin-rear.jpg Just right click on the image to open in a new window at full resolution, as I think the forum ...
by TWINKYTWONKA
Sat Nov 23, 2019 6:21 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

Looking at the close up pictures, the laser etching does not look as I would expect on these chips, especially compared to the batches I have been supplied with via Digi-Key. However this may be down to the quality of picture taken it's hard to tell. I don't have a genuine 6 tin chip here but i do ...
by TWINKYTWONKA
Sat Nov 23, 2019 6:20 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

Looking at the close up pictures, the laser etching does not look as I would expect on these chips, especially compared to the batches I have been supplied with via Digi-Key. However this may be down to the quality of picture taken it's hard to tell. I don't have another 6 tin chip here but i do ha...
by TWINKYTWONKA
Thu Nov 21, 2019 3:35 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

Please see the response from the supplier below to our technical team: "Different batches, cannot working stable, we are also confused for this. Some suggestions as follow. 1).For the power supply filter, please follow my previous email. It may be not the major factor for this issue, but it is...
by TWINKYTWONKA
Thu Nov 21, 2019 11:33 am
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

Re: SDRAM board

Won't surprise if it's remarked MT48 chip. For most applications no one will notice the difference. Just higher power consumption which may be not so noticeable if board has many different chips. latest reply from mouser below. I'm not sure what they mean by register configuration? Please see the r...
by TWINKYTWONKA
Wed Nov 20, 2019 6:13 pm
Forum: MiSTer
Topic: SDRAM board
Replies: 461
Views: 163319

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: 461
Views: 163319

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: 461
Views: 163319

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: 461
Views: 163319

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: 3389

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: 461
Views: 163319

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: 461
Views: 163319

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: 461
Views: 163319

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: 461
Views: 163319

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: 3531

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: 457
Views: 240001

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: 457
Views: 240001

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: 457
Views: 240001

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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