---
title: "EPROM Cartridge Board"
id: 27273
type: "product"
slug: "eprom-cartridge-board"
url: "http://localhost/product/eprom-cartridge-board/"
markdown_url: "http://localhost/product/eprom-cartridge-board.md"
published_at: "2020-09-27T12:44:52+00:00"
modified_at: "2026-03-22T13:13:07+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-a-1.jpg"
excerpt: "This device would have been used by Timex and third-parties in developing cartridge software. It's likely that fewer than 100 were made. A plastic \"sled\" under the PCB aids insertion. Demonstrated by Dan Ross at the introduction of the TS 1500 and TS 2068, the \"Chameleon\" cartridge, with a Spectrum ROM, allowed the 2068 to…"
category:
  - name: "Emulator"
    slug: "emulator"
    taxonomy: "category"
    url: "http://localhost/category/hardware/emulator/"
post_tag:
  - name: "Prototype"
    slug: "prototype"
    taxonomy: "post_tag"
    url: "http://localhost/tag/prototype/"
  - name: "Timex Computer Corporation"
    slug: "timex-computer-corporation"
    taxonomy: "post_tag"
    url: "http://localhost/tag/timex-computer-corporation/"
  - name: "TS 2068"
    slug: "ts2068"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts2068/"
model:
  - name: "Timex/Sinclair 2068"
    slug: "ts-2068"
    taxonomy: "model"
    url: "http://localhost/model/ts-2068/"
genre:
  - name: "Emulation"
    slug: "emulation"
    taxonomy: "genre"
    url: "http://localhost/type/emulation/"
  - name: "Hardware"
    slug: "hardware"
    taxonomy: "genre"
    url: "http://localhost/type/hardware/"
company:
  id: 11401
  title: "Timex Computer Corporation"
  type: "company"
  url: "http://localhost/company/timex-computer-corporation/"
model_2: "SK2000-81"
date: 1983
rarity: "Rare"
companies_products:
  - id: 11401
    title: "Timex Computer Corporation"
    type: "company"
    url: "http://localhost/company/timex-computer-corporation/"
---

This device would have been used by Timex and third-parties in developing cartridge software. It’s likely that fewer than 100 were made. A plastic “sled” under the PCB aids insertion.

Demonstrated by Dan Ross at the [introduction of the TS 1500 and TS 2068](https://youtu.be/DBsxK2yLyGo?t=2080), the “Chameleon” cartridge, with a Spectrum ROM, allowed the 2068 to run Spectrum software. Instructions, a schematic and artwork for making your own were [published in the technical manual](https://archive.org/stream/TimexSinclair2068Manuals/TimexSinclair2068_TechnicalManual#page/112/mode/2up).

The board supports up to four 16K EPROMS (27128), mapped across the 64K memory space of the 2068. Address lines A14 and A15 are combined with /ROSCS (Rom Oriented Software Chip Select) and /RDB (read) to select each EPROM’s /CE (chip enable) line.

- [![Image](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-a-1-1024x503.jpg)](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-a-1.jpg)
- [![Image](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-d-1024x779.jpg)](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-d.jpg)
- [![Image](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-c-1024x673.jpg)](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-c.jpg)
- [![Image](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-e-1024x501.jpg)](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-e.jpg)
- [![Image](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-f-1024x473.jpg)](http://localhost/wp-content/uploads/2020/09/Timex-EPROM-cartridge-f.jpg)