First post, by MatthewH12
I'm trying to upgrade the VRAM and Cache on a PB420 486 Motherboard.
Here's what it says I need:
Cache Upgrade
The chips may be 25ns, 20ns, or 15ns while the Tag SRAM can be either 20ns or 15ns. The Cache and TAG RAM are either 28-pin for 32KB or 128KB of cache, or 32-pin for 512KB of cache. The PB410 uses the same cache chips as the PB430.
Video Memory Upgrade
Video memory is upgraded by installing a 256KBx16 70ns or 80ns DRAM ZIP at location U20. The ZIP needs to be ASYMMETRICAL (Write Enabled). This DRAM ZIP is not the same chip used for PB430/440/440T upgrades.
My problem is that, I don't know where I can even these parts these days. I don't know enough about chips to know what part numbers I can search for or even where to look to find these parts inexpensively.
Can anyone help? Thanks!