add-on for their 386SX/20— and you needed to add that module before you added even more memory in the form of proprietary SIMMs. SIPs can be troublesome because they are difficult to find replacements for, so expect replacement memory modules using them to cost a premium.
- SOJ (Small-Outline J Lead) This is the contemporary package style for surface mount circuits. The leads protrude
from the package like a DIP, but are bent around just under the package in the form of a j. Sockets for SOJ packages are often used for replaceable memory ICs,
such as the BIOS ROM, but most RAM devices are soldered directly to the motherboard as system memory (or a video board as video RAM. SIMMs often use SOJ memory components.
- TSOP (Thin, Small-Outline Package) Like the SOJ, a TSOP is also a surface-mount package style. However, its small, thin body makes TSOP memory ideal for narrow spaces. Expect to find such devices serving as memory in notebook/sub-notebook systems or PCMCIA cards (aka, PC Cards.
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