Most (not all) COAST are specific to certain motherboards or to the motherboard company. Very few were cross compatible. I wish there was a catalog of which go with what....

PC@LIVE wrote on 2024-10-08, 20:39:

So, I have a couple of 256 KB COAST L2 cache modules, one year ago I tried it unsuccessfully on an Intel VX MB, to try to expand […]
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So, I have a couple of 256 KB COAST L2 cache modules, one year ago I tried it unsuccessfully on an Intel VX MB, to try to expand the present 256 KB cache, in total I would have reached 512 KB.

Recently, I bought a Siemens HX MB without cache on board, there is the possibility of adding the L2 cache, through a COAST cache module, in this case I could have 256 KB, and it would be better to have 256, rather than 0.

The question I would ask is, are the COAST modules compatible, because the pinch is standard, or does each MB need its COAST module, or other compatible ones?

Moreover, on the modules, there are no useful indications to understand in which card they can be used, for example a PC66 RAM is not good in an MB that uses PC133 RAM.

I have no idea if there is a cataloguing, COAST modules and on motherboards, in which they can be installed, if you have ideas and suggestions, they are very much appreciated, in short if it goes well in one PC, it is not said that it can be used in another, and above all it is possible that you can damage the motherboard (?), if for example it has a particular or different pining.

Post a picture, someone here may be able to identify it.

Yes it's unfortunate that the slot was readily used but there seems to be no standard pinout.

I suggest you don’t slap random COAST modules to motherboards you don’t know they are compatible with. You can fry the module, motherboard or both in the worst case.

For example 'Cypress High-Performance Data Book 1995' lists a ton of L2 modules and chipsets they work with :

1CYM7421     82420 PCIset-Compatible Level II Cache Module
2CYM7424     128K Cache Module for the Intel™ 82420EX PCIset
3CYM7425     256K Cache Module for the Intel 82420EX PCIset
4CYM7427     82420 PCIset-Compatible Level II Cache Module Family
5CYM7428     82420 PCIset-Compatible Level II Cache Module Family
6CYM7432     256K Pentium-Compatible Cache Module
7CYM7450     128K Cache Module for VLSI VL82C483 Chipset
8CYM7451     256K Cache Module for VLSI VL82C483 Chipset
9CYM7490     i486™ Level II Cache Module
10CYM7491     i486 Level II Cache Module
11CYM7492     i486 Level II Cache Module
12CYM74A430   Intel 82430FX PCIset Level II Cache Module
13CYM74AS50   OPTi Viper Chipset Level II Cache Module
14CYM74AS51   OPTi Viper Chipset Level II Cache Module
15CYM74AS90   VLSI 82CS90 Chipset Level II Cache Module
16CYM74AP54   Intel 82430NX Chipset Level II Cache Module
17CYM74S430   Intel 82430FX PCIset Level II Cache Module
18CYM74S431   Intel 82430FX PCIset Level II Cache Module
19CYM74S550   OPTi Viper Chipset Level II Cache Module
20CYM74S551   OPTi Viper Chipset Level II Cache Module
21CYM74S590   VLSI 82CS90 Chipset Level II Cache Module
22CYM74S591   VLSI 82C590 Chipset Level II Cache Module
23CYM74SP54   Intel 82430NX Chipset Level II Cache Module
24CYM74SP55   Intel 82430NX Chipset Level II Cache Module
25CYM9230     82420 PCIset-CompatibleLevel II Cache Module
26CYM9231     82420 PCIset-Compatible Level II Cache Module
27CYM9236     128K Cache Module for the UMC491 Chipset
28CYM9237     256K Cache Module for the UMC491 Chipset
29CYM9244     128K Cache Module for the OPTi 802GP Chipset
30CYM9245     256K Cache Module for the OPTi 802GP Chipset
31CYM9246     128K Cache Module for the OPTi 802GP Chipset
32CYM9247     256K Cache Module for the OPTi 802GP Chipset

When it comes to Intel 430 chipsets and Pipelined Burst cache afaik 160 pin COAST 2.0 setup was standardized by Intel and almost? everybody used same thing.

Horun wrote on 2024-10-09, 03:52:

Most (not all) COAST are specific to certain motherboards or to the motherboard company. Very few were cross compatible. I wish there was a catalog of which go with what....

Thank you very much for the information, in fact I too would find a list of COAST very useful, and on which MB they are fine.

bertrammatrix wrote on 2024-10-09, 04:14:

PC@LIVE wrote on 2024-10-08, 20:39:

So, I have a couple of 256 KB COAST L2 cache modules, one year ago I tried it unsuccessfully on an Intel VX MB, to try to expand […]
Show full quote

So, I have a couple of 256 KB COAST L2 cache modules, one year ago I tried it unsuccessfully on an Intel VX MB, to try to expand the present 256 KB cache, in total I would have reached 512 KB.

Recently, I bought a Siemens HX MB without cache on board, there is the possibility of adding the L2 cache, through a COAST cache module, in this case I could have 256 KB, and it would be better to have 256, rather than 0.

The question I would ask is, are the COAST modules compatible, because the pinch is standard, or does each MB need its COAST module, or other compatible ones?

Moreover, on the modules, there are no useful indications to understand in which card they can be used, for example a PC66 RAM is not good in an MB that uses PC133 RAM.

I have no idea if there is a cataloguing, COAST modules and on motherboards, in which they can be installed, if you have ideas and suggestions, they are very much appreciated, in short if it goes well in one PC, it is not said that it can be used in another, and above all it is possible that you can damage the motherboard (?), if for example it has a particular or different pining.

Post a picture, someone here may be able to identify it.

Yes it's unfortunate that the slot was readily used but there seems to be no standard pinout.

Yes, of course, no problem.

I imagined that the pinout were not standard.

CharlieFoxtrot wrote on 2024-10-09, 06:35:

I suggest you don’t slap random COAST modules to motherboards you don’t know they are compatible with. You can fry the module, motherboard or both in the worst case.

OK thank you very much

In fact you're right, it's not a good idea to try randomly, because you can hardly find the right one, since the contacts could be different, rather it's better to use the same MB that works, maybe you can find someone who has the same MB with the right form.

rasz_pl wrote on 2024-10-09, 08:20:

For example 'Cypress High-Performance Data Book 1995' lists a ton of L2 modules and chipsets they work with : […]
Show full quote

For example 'Cypress High-Performance Data Book 1995' lists a ton of L2 modules and chipsets they work with :

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1CYM7421     82420 PCIset-Compatible Level II Cache Module
2CYM7424     128K Cache Module for the Intel™ 82420EX PCIset
3CYM7425     256K Cache Module for the Intel 82420EX PCIset
4CYM7427     82420 PCIset-Compatible Level II Cache Module Family
5CYM7428     82420 PCIset-Compatible Level II Cache Module Family
6CYM7432     256K Pentium-Compatible Cache Module
7CYM7450     128K Cache Module for VLSI VL82C483 Chipset
8CYM7451     256K Cache Module for VLSI VL82C483 Chipset
9CYM7490     i486™ Level II Cache Module
10CYM7491     i486 Level II Cache Module
11CYM7492     i486 Level II Cache Module
12CYM74A430   Intel 82430FX PCIset Level II Cache Module
13CYM74AS50   OPTi Viper Chipset Level II Cache Module
14CYM74AS51   OPTi Viper Chipset Level II Cache Module
15CYM74AS90   VLSI 82CS90 Chipset Level II Cache Module
16CYM74AP54   Intel 82430NX Chipset Level II Cache Module
17CYM74S430   Intel 82430FX PCIset Level II Cache Module
18CYM74S431   Intel 82430FX PCIset Level II Cache Module
19CYM74S550   OPTi Viper Chipset Level II Cache Module
20CYM74S551   OPTi Viper Chipset Level II Cache Module
21CYM74S590   VLSI 82CS90 Chipset Level II Cache Module
22CYM74S591   VLSI 82C590 Chipset Level II Cache Module
23CYM74SP54   Intel 82430NX Chipset Level II Cache Module
24CYM74SP55   Intel 82430NX Chipset Level II Cache Module
25CYM9230     82420 PCIset-CompatibleLevel II Cache Module
26CYM9231     82420 PCIset-Compatible Level II Cache Module
27CYM9236     128K Cache Module for the UMC491 Chipset
28CYM9237     256K Cache Module for the UMC491 Chipset
29CYM9244     128K Cache Module for the OPTi 802GP Chipset
30CYM9245     256K Cache Module for the OPTi 802GP Chipset
31CYM9246     128K Cache Module for the OPTi 802GP Chipset
32CYM9247     256K Cache Module for the OPTi 802GP Chipset

When it comes to Intel 430 chipsets and Pipelined Burst cache afaik 160 pin COAST 2.0 setup was standardized by Intel and almost? everybody used same thing.

Thank you very much, very interesting.

I'll look if I can find one of those modules, then if I find one, we'll see if it can be good for my MBs, currently at hand I have the Siemens D969, but I should also have a PCChips M507 and an Intel VX card, these are the ones I remember, there could be others though.