---
title: "The TIMEXsinclair 2068: Bank Switching and Memory Expansion"
type: "article"
slug: "the-timexsinclair-2068-bank-switching-and-memory-expansion"
url: "http://localhost/article/the-timexsinclair-2068-bank-switching-and-memory-expansion/"
markdown_url: "http://localhost/article/the-timexsinclair-2068-bank-switching-and-memory-expansion.md"
published_at: "2026-03-15T00:43:57+00:00"
modified_at: "2026-03-15T00:43:57+00:00"
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excerpt: "A landmark technical article proposing interim standards for expanding the TS2068 beyond its standard memory limits. Introduces a Bank Switching Controller (BSC) design using a standard PC expansion backplane (EVEREX SYSTEMS EV-168) and an adapter card (VIDJUP Co. design) that can address up to 16 megabytes of memory. Covers the Current Chunk Owner Table (CCOT),…"
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  - name: "Bank Switching"
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  - name: "SCLD"
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  - name: "TS 2068"
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model:
  - name: "Timex/Sinclair 2068"
    slug: "ts-2068"
    taxonomy: "model"
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indiv:
  - name: "William J. Pedersen"
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publication_r:
  id: 21571
  title: "Timelinez"
  type: "periodical"
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authors_r:
  - name: "William J. Pedersen"
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volume: "7"
issue: "5"
issues_articles:
  - id: 38871
    title: "Timelinez v7 n5/6"
    type: "issue"
    url: "http://localhost/issue/timelinez-v7-n5-6/"
pages: "1"
pubdate: "May/June 1989"
archive_link: false
---

# The TIMEXsinclair 2068: Bank Switching and Memory Expansion

A landmark technical article proposing interim standards for expanding the TS2068 beyond its standard memory limits. Introduces a Bank Switching Controller (BSC) design using a standard PC expansion backplane (EVEREX SYSTEMS EV-168) and an adapter card (VIDJUP Co. design) that can address up to 16 megabytes of memory. Covers the Current Chunk Owner Table (CCOT), auto-configuration theory, ROM switching control with port assignments 132-135, handling of HOME/EXROM/DOCK banks as real external banks, WAIT signal generation, and daisy chain addressing. Includes Figures 1 (BSC) and 2 (Memory Bank) with full circuit specifications.