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ZX-28 Interface Module
Introduction
The ZX-28Interface Module (for brevity, Module hereafter) is intended to simplify the prototyping of a project
using a ZX-328n or similar compatible 28-pin ZX device. It provides most of the external circuitry (e.g. crystal,
serial level converter) that is necessary to support a 28-pin ZX microcontroller. It could also be used for other
ZX devices that do not require external EEPROM for Program Memory.
The Module is provided as a kit to be assembled by the purchaser. It is designed to be plugged into a
solderless breadboard but it may be wired directly to another circuit assembly if desired.
Connections and Jumpers
The Module connects to a ZX device via J1. It also provides RS-232 signal level conversion for Com1 via J2
and supports two additional level conversion paths (one input and one output) via J5. The annotated image
below illustrates the layout of the Module’s PCB.
J1
The pins of J1, marked as 1 through 10, and are intended to be connected to the corresponding pins of a ZX-
328n or similar compatible 28-pin ZX device.
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