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The original Model A and B proved popular, but were quickly replaced with a new board design known as the Plus. Split into the Model A+ and Model B+ (see Figure 1-3), these revisions introduced the now-standard 40-pin GPIO header while also improving various other features; they did not, however, change from the BCM2835 SoC, meaning there is no appreciable difference in performance between the Plus variants and the older non-Plus models.

FIGURE 1-3: The Raspberry Pi Model B+ board

The hardware split between the Model A+ and Model B+ is similar to that of the Model A and Model B: the A+, which has a smaller footprint than the Model A, has either 256 MB or 512 MB of memory depending on when it was purchased, a single USB port, and no network capabilities; the Model B+ has 512 MB of memory, four USB ports, and a 10/100 wired network port.

The Raspberry Pi Model A+ and Model B+ are compatible with all software and devices mentioned in this book, and use the same GPIO layout as the newer-model Pi variants. If you currently own a Model A+ or Model B+, the only reason you may have to upgrade is to improve performance, gain additional memory, or enjoy built-in wireless capabilities.