Wednesday, April 29, 2026

Purchased a PPEB


I just purchased an 8M PPEB with case and the activity led installed. Has a preloaded microsd card included.

A "8MB PPEB" for the TI-99/4A refers to a modern, compact, all-in-one expansion device built around a Raspberry Pi Pico W, designed to emulate the massive, original 1980s Peripheral Expansion Box (PEB). "PPEB" stands for [Pi Pico[W] Peripheral Expansion Box].



It is designed to fit in a small case. Mine in a 3D-printed enclosure or sometimes a repurposed original speech synthesizer case and plugs directly into the TI-99/4A's side expansion port, rather than needing a large external unit.

Key Features and Capabilities:
- 8MB RAM Expansion: This specifically provides massive memory expansion, often utilizing SAMS (software-activated memory system) memory management to support 1MB or 8MB configurations, far exceeding the original 32K limit.  There are configurations that support 16MB.

- Virtual Disk Storage: The device emulates floppy drives and hard drives using a MicroSD card or the Pico's internal storage, allowing you to run games and software without physical disk drives.
Sidecar Form Factor: It replaces the massive, 30 lb original PEB box and its many expansion cards with one small module that sits on the side of the computer.

- Modern Connectivity: It often provides USB or Wi-Fi capabilities for file transfers.

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