fallemarg
Experienced Member
@Anonymous - I may have. You are correct that you can put a standard SRAM chip in the TAG Cache spot, but that doesn't necessarily mean that it will work. The TAG chip contains the comparator, as you mentioned which is used to build a table for the location of the Cache RAM. On newer systems, like socket 7 boards, you may be correct that the comparator logic is built into the motherboard, but this socket is specifically labeled TAG, which would indicate to me that I would need to install an actual TAG chip for this system. As such the information that I have found shows the accompanying TAG chip for my ATT7C199P-15 is an 8kx8 28-pin ATT7C174P-15 chip. I know the TH99 indicates a 32kx8 chip, but I have been unsuccessful in locating or identifying a 32kx8 TAG chip from what I have come across. I assume they exist, but I have not had luck in finding them. I may have found another handle on getting a TAG chip though. Wish me luck. I am going to try and call the source shortly.
-Edit- I misread your follow up post. I currently have the TAG socket filled with a standard SRAM chip and I can confirm completely that with a standard SRAM in the TAG socket my L1 cache dropped from 64.4MB/s with no L2 to 31.8MB/s with L2. My system ram dropped from 19.8MB/s to 11.8MB/s Very confusing. So yes, it does work, but performance has suffered. I read the different numbers listed in that ultimate 486 benchmark and I am literally half the speed that the 486DX2-66 scored in the exact same benchmarks. It looks like I really do need a TAG chip for this system.
-Edit- I misread your follow up post. I currently have the TAG socket filled with a standard SRAM chip and I can confirm completely that with a standard SRAM in the TAG socket my L1 cache dropped from 64.4MB/s with no L2 to 31.8MB/s with L2. My system ram dropped from 19.8MB/s to 11.8MB/s Very confusing. So yes, it does work, but performance has suffered. I read the different numbers listed in that ultimate 486 benchmark and I am literally half the speed that the 486DX2-66 scored in the exact same benchmarks. It looks like I really do need a TAG chip for this system.
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