I do not think so... just count the legs 😦

search for 28 pin dip ram.

Buy 12 or 10 ns ones (if you can find them and they are in your price range)

this look appropriate, but I found it at random, costs too much:

http://www.ebay.com/itm/10pcs-IC-IS61C256AH-1 … =item2c5895f109

U5-U8 slots are 32DIP slots actually : http://www.amoretro.de/2012/08/shuttle-hot-41 … otherboard.html

The link for the MB I gave in the original post says four 128k x 8 modules in the first four slots for 512KB, can't use 8 modules of 512Kb, only four of 1024Kb.

So they would be ok, woudn't they ? The intel 10ns ones ?

The chip still looks the wrong type to me. It is not so narrow in shape than usual cache chips and first of all, you also need to interpret the part number on it...

look at these pics in the thread starter post, those should work:

Re: Super Fast 486 Cache - 10 ns

YEs, they are wrong type 😀
Too large, and too slow (100ns).

I ofund the right ones thanks to this thread : http://www.vintage-computer.com/vcforum/showt … uttle-HOT419-R2

The third item down in that photo is what you want, that is, refering to the link Jolaes76 posted. It can be -10, -12, or -15. The chips shown in that photo are all 10 ns, not 100 ns.

$5 per module is very pricey, almost 3x what I paid from independent Chinese IC sources. Long before I found my 10 ns chips, I did buy a few of these over-priced 15 ns chips on eBay. 1 in 16 were bad, but the error was not obvious. Sometimes it would work and sometimes it would not. I singled out the bad chip with an SRAM tester later on.

If you are using 64 MB of RAM, I do not expect the gain from 1024 KB cache vs. 512 KB cache to be more than 3%.

Yes it's kind of expensive, but well, i didn't find other offers using the reference (same as yours but 15ns).
Anyway my HOT419 only takes 512K. I won't have tools to test it thoroughly sadly. I ordered 5, just to be on the safe side.
And as you noted last time, my HOT433 needs some socket soldering and all, so i'll leave it at 256k in write trough.

I upgraded my Asus board (in sig) from 256 to 512 and found very little difference - only cacheable range changed (ie windows/linux would be a bit better). Benchmarks didn't show up more than a few %, as feipoa says.

I'm actually doing it just for the cacheable area 😉
And for the pleasure of having my perfect 486 😁

Hey guys,

Let me add fresh info on this topic, as I am currently- in 02/2019 - building my 486 nostalgia machine based on Shuttle HOT-419 DZ R2 motherboard
http://www.elhvb.com/supportbios.info/Archive … 419dz.htm#hd001

My board was, as I bough it, fitted with full banks of Alliance CMOS SRAM chips (4pcs AS7C256-20PC and 4+1pcs AS7C1024-20TPC), but on startup it says the cache memory is bad and I need to disable it.
So I figured it would be best to get new chips, rather than figuring out which are bad and which are not.

I just bought these off Ebay↓ I figured that with these types and qty, I can try both 256K and 512K cache configs that my MB should support, and have a piece or two for spare:

5pcs IS61C1024-15N IS61C1024 128K x 8 HIGH-SPEED CMOS STATIC RAM DIP-32
Link below - 7,63 USD for 5pcs
https://www.ebay.com/itm/5pcs-IS61C1024-15N-I … &frcectupt=true

10PCS IS61C256AH-15N Encapsulation:DIP-28,32K x 8 HIGH-SPEED CMOS STATIC RAM
Link below - 12,70 USD for 10pcs
https://www.ebay.com/itm/10PCS-IS61C256AH-15N … ~RzH:rk:18:pf:0

I will update you if and how they work with HOT 419 DZ R2 mobo, once I get them

Different sizes most likely do not work correctly - this might cause the "cache memory is bad" display. Could be afew other reasons too.

Does the HOT419 support 1MB of 2nd level cache? Normally smaller modules mean less trouble but in your case both of your options are fake ones, so it's a bet either way.

Buy both and take dead ones into account.

amadeus777999 wrote:

Does the HOT419 support 1MB of 2nd level cache?

I follow the manual I link to in my post above, HOT-419 DZ R2 supports up to 512K cache.
256K is done by 4pcs 32k x 8 chips in BANK 0, 4pcs 32k x 8 chips in BANK 1, with 1pc 32k x 8 chip for Tag RAM
512K is done only by 4pcs 128k x 8 chips in BANK 0 (BANK 1 empty), with 1pc 32k x 8 chip for Tag RAM

We shall see

assasincz wrote:

We shall see

So...an update is due,
Well the 32k x 8 chips arrived a few weeks ago. I replaced all SRAM chips on board with these (4x in Bank 0, 4x in Bank 1, and 1pc tag ram) for 256kB cache configuration, set the jumpers as per manual, enabled external cache in bios - but the computer would not boot, I do not know why. After some troubleshooting, still nothing

Today however the 128k x 8 chips arrived. So I gave it a go, put 4pcs in Bank 0, keeping the 32k x 8 chip for tag RAM, and removing all other chips from Bank 1, set the jumpers as per manual and SUCCES!

I am now thinking there is something physically wrong with bank 1 on my board, but no matter - Now I can bask in glory of enhanced performance (irony alert) but it makes me happy to max out the setup in all possible ways.

Great to hear - which cache timings have you set?

The board not booting at all due to the cache is strange behavior but can also be observed with the Shuttle HOT433. Once you remove the cache, or one or more ICS are damaged, the board tends to become erratic. Other boards just disable the banks and work as usual.

I’m going to give this upgrade a shot if I can find the chips on the cheap.

My version of the board looks like a cut down revision that is missing the 3.3v regulators. Has places on the Mobo for them, but the pads are not populated. Could it be as simple as just soldering the right regulator into place?