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ZX-40 Series Interface Module
Introduction
The ZX-40 Interface Module (for brevity, Module hereafter) is intended to simplify the prototyping of a project
using a ZX-40 series microcontroller. It provides most of the components (e.g. crystal, EEPROM, serial level
converter) that are necessary to support a ZX-40 series device. It could also be used for a project employing a
ZX-44 series device but it is more likely that one would use surface mount components in that case. Note that
this Module may be used for ZX-40 series devices that require an external EEPROM as well as those that do
not. In the latter case, U1 and R3 may be omitted.
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-40 series chip 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 5 through 15, and are intended to be connected to the corresponding pins of a ZX-40
series device.
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