This is a classic vintage computer memory module specification from the late 1990s era of computing. Here is a breakdown of what each part of this specification means:
​Module Breakdown
​Brand: Kingston
​Capacity: 64MB (Megabytes—note that this is MB, not GB, common for late-90s systems running Windows 95/98).
​Memory Type: SDR SDRAM (Single Data Rate Synchronous Dynamic Random-Access Memory).
​Bus Speed / Rating: PC-66 (Operates on a 66 MHz system bus speed).
​Form Factor: 168-Pin DIMM (Dual In-line Memory Module, standard for desktop PCs of the Pentium/Pentium II generation).
​Error Correction: Non-ECC (Error-Correcting Code is typically used in servers; this is standard consumer/desktop memory).
​Buffering: Unbuffered (Unregistered; direct communication between the memory controller and the RAM chips).
​Part Number: KTA-603/64 (A specific Kingston part number often targeted or qualified for specific systems, such as Apple Macintosh or legacy branded desktop systems of that era).
​Context and History
​Era: Late 1990s (c. 1997–1999).
​Typical Use Cases: Upgrading older Pentium, Pentium II, or contemporary legacy system architectures where 66 MHz system buses were standard before PC-100 and PC-133 memory became mainstream.