Sold 4164/41256 DRAM (memory) chips tester for C64 and more

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anemo

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DRAMBOARD V1.2 – 4164/41256 DRAM chip tester

Test memory chips for the C64 (breadbin) quick and easy! 8x 4164 DRAM (8x8kB) are used in older C64:s.

Arduino Nano-based DRAM (Dynamic RAM) tester for 4164* and 41256** type DRAM chips.

User manual: http://docs.anemo.se/dramboard-manual.pdf (right-click to save)

Availability:
SOLD OUT - no new batch planned in near future
4164-41256-dram-tester-v1-2--1.jpg


Four loops with four memory verify tests are run:

1. Fill with ones
2. Fill with zeros
3. Fill with alternating ones and zeros
4. Fill with alternating zeros and ones


• Test time, 4164: 40 seconds
• Test time, 41256: 1 minute, 45 seconds

• Duo color status LED:
Green - Init & passed all tests
Yellow/orange - tests running
Red (blinking) test failed

• Arduino current supply overcurrent protection (Polymer PTC self-resettable fuse)
• Arduino output pins overcurrent protection (current limiting resistors, new for v1.2)
• Serial monitor (9600 bauds)



Pre-programmed Arduino Nano (socketed) and 30 cm mini-USB cable included. DRAM chip in pictures is NOT included
1f642.png

Note! 4164 chips detected as working/defective has been verified in real C64. 41256 test mode is BETA as I haven't had the opportunity to test chips from multiple manufacturers. Tests are not 100% accurate (timing wise) and should be seen as an good indication.

PRICE & PAYMENT:

€31.5 including international UNTRACKED shipping
€39 including TRACKED shipping

Payment as gift via Paypal

Drivers for the CH340 chipset is needed for serial communication: https://sparks.gogo.co.nz/ch340.html
- - -

4164-41256-dram-tester--2.jpg


Image above shows v1.0
4164-41256-dram-tester--3.jpg

4164-41256-dram-tester--3.png


*4164 DRAM cross reference:

MB8264-15 (Fairchild)
MB8264A-15 (Fujitsu)
HM4864, HYB4164P2BD (Hitachi)
M3764A-15 (OKI)
MT4264-25 (Micron)
M5K4164AP-15, M5K4164 ANP-10 (Mitsubishi)
MK4564N-20 (Mostek)
MCM4164BP15, MCM6665BP20, MCM6665AP (Motorola)
D4164C-2, D4164C-15, uPD 4164-1 (NEC)
KM4164B-15 (Samsung)
TMM4164 C-3, TMS4164-15NL, TMS4164-20NL (Toshiba)


**41256 DRAM cross reference:

TMS4256 (Toshiba)
MCM6256 (Motorola)
HM51256 (Hitachi)
MB81256 (Fujitsu)
HYB41256 (Siemens)
KM41256 (Samsung)
MSM41256 (OKI)
uPD41256 (NEC)

The boards are also sold elsewhere!
 
Last edited:
Hi,
looks like I've come too late to the party, but hopefully you'll make further batches. I have a few questions to the device:

- Are all the pins to the DUT controlled by the Arduino or are any pins hardwired?
- Is the source code open source.

The reason I ask is because I'd like to expand the device to check other IC's which may have conflicting pinouts.

Bryce.
 
Hi,
looks like I've come too late to the party, but hopefully you'll make further batches. I have a few questions to the device:

- Are all the pins to the DUT controlled by the Arduino or are any pins hardwired?
- Is the source code open source.

The reason I ask is because I'd like to expand the device to check other IC's which may have conflicting pinouts.

Bryce.

Hi,

I will probably make a small batch (~10-20 boards) in the near future so more boards.

I don't have the schematics available right now but it has been inspired by similar projects found online like these: http://www.chronworks.com/DRAM/, http://forum.defence-force.org/viewtopic.php?t=1699

The supply voltage (Vcc) and GND are hardwired on my board and I've had a few requests expanding the chip types supported but I don't have the time for it right now.

I might release my code and schematics as open source in the near future but it have to be maintained by somebody else in that case to take it to the next level.
 
Thanks, maybe I'll look at making my own version where the supply voltage is selectable so that shorter RAM and Logic chips could be tested too.

Bryce.
 
Thanks, maybe I'll look at making my own version where the supply voltage is selectable so that shorter RAM and Logic chips could be tested too.

Bryce.

44256 DRAM (C64C) support would probably be appreciated. But
it's easier to test in the actual device with only two DRAM chips.
 
I wouldn't mind one either.

I also wouldn't mind one that could test 4256s/11000s (128kb)
 
I wouldn't mind one either.

I also wouldn't mind one that could test 4256s/11000s (128kb)

It will never be able to test those due to the pin count and the hardwired VCC and GND, that's why I mentioned looking into developing an expanded version (see page 1) of my own.

Bryce.
 
I wouldn't mind one either.

I also wouldn't mind one that could test 4256s/11000s (128kb)

It will never be able to test those due to the pin count and the hardwired VCC and GND, that's why I mentioned looking into developing an expanded version (see page 1) of my own.

Bryce.

I am incredibly well aware of that... how dare I suggest an interest in an 'upgraded' version that tests DIL-20 128K chips. (hence: 'one that could')
 
Ah sorry, understood. I didn't realise you meant a new device. So far there's been no mention from anemo that he would make an upgraded version, just another batch of the same version, which is why I'm looking at doing one myself.

Bryce.
 
Ah sorry, understood. I didn't realise you meant a new device. So far there's been no mention from anemo that he would make an upgraded version, just another batch of the same version, which is why I'm looking at doing one myself.

Bryce.

No current plans to do a device with extended chip support as I lack free time just now.
 
So do I, but I've added it to my "possible projects list" for the future.

Bryce.
 
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