[Hardware Mod] 8MB in (PU-18) Retail PSX

General information to do with the PlayStation 1 Hardware. Including modchips, pinouts, rare or obscure development equipment, etc.
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karlmartin95
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Re: [Hardware Mod] 8MB in (PU-18) Retail PSX

Post by karlmartin95 » October 5th, 2018, 6:25 am

TriMesh wrote:
January 16th, 2014, 3:22 am
AmiDog wrote:Hmm, are we talking about these RAM chips?
Sadly, they won't work - the first thing is that they are "KM48C" rather than "KM48V" - so they are designed to operate from 5V rather than 3.3V. The second is that the '0' at the end indicates that they are fast page mode devices - and the PSX memory controller is designed to work with EDO chips. For reference, you can't use the KM48V2004AJ-6 either - it has 4096 row addresses, and the PSX memory controller doesn't support that.

In fact, the only other part I found that seemed to be compatible was from NEC - and nobody seemed to ever had had it in stock - I assume it must have existed, since it was listed in an old NEC shortform catalog, but nobody that I could find ever seems to have actually used it.
Hi Trimesh, I need your help.

First, I must congratulate you for this amazing tutorial, so congratulations!

Second, I cannot find those dram memories, so looking in my house I found 8 DRAM Chips from a PC SIMM Memory. These chips are nearly the same chip that you used in your proyect, but... Mine has an operational voltage of +5V. The exact model is: KM48C2104AJ-6, I readed the KM48V2104AJ-6 (the DRAM used in this proyect) datasheet and I compared with the KM48C2104AJ-6 and I didn't find any difference, only the voltage operational ratio. So.. if I supply the memory with the specific voltage, Could it work?

Thanks and I'll wait your response. Cheers !

Edit1: I discovered that my chips are EDO. It's really a shame the voltage issue.

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Re: [Hardware Mod] 8MB in (PU-18) Retail PSX

Post by Alexander_H » October 19th, 2018, 5:26 am

Hi karlmartin95,
try to get an old EDO-DIMM from an old Notebook.
The Notebook used often the voltage of 3.3 Volts.

In the online Auction House can you find sometimes
a DIMM from Samsung KMM466F213BS1-L6. This i used for.
The Chips should be KM48V2104BS-L6.

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Re: [Hardware Mod] 8MB in (PU-18) Retail PSX

Post by JephSnow » April 24th, 2019, 4:37 pm

can anyone tell me where I can find the "km48v2104aj-6"?

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Re: [Hardware Mod] 8MB in (PU-18) Retail PSX

Post by danhans42 » April 24th, 2019, 5:57 pm

As I mentioned earlier in the thread, check alibaba.com as I managed to source some through there fairly easily.

https://www.alibaba.com/showroom/ic-km48v2104aj-6.html

I used Winsource...

https://www.alibaba.com/product-detail/ ... 1192fJ23DP

They accepted paypal, were great with communication and shipped quickly. I paid for faster shipping but was reasonable and arrived in UK within a week.

Good luck
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Re: [Hardware Mod] 8MB in (PU-18) Retail PSX

Post by JephSnow » April 24th, 2019, 11:12 pm

I saw but they didn't work. I tried to contact them, hopefully good. (sorry for the bad English, I'm using a translator) Thanks :praise

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Re: [Hardware Mod] 8MB in (PU-18) Retail PSX

Post by danhans42 » April 24th, 2019, 11:23 pm

They are based in China, so completely different time zone to where I am in England, so replies often came overnight.

That being said, they were very helpful and often followed up with emails post sale to make sure the parts I purchased were okay.

No need to apologise.. your translated English is coming through fine :-)

Good luck
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