---
title: "Memory Access Monitor"
id: 24660
type: "product"
slug: "memory-access-monitor"
url: "http://localhost/product/memory-access-monitor/"
markdown_url: "http://localhost/product/memory-access-monitor.md"
published_at: "2020-01-19T20:16:30+00:00"
modified_at: "2026-03-22T13:13:15+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Eight LEDs indicate which bank of memory the Z80 is accessing. Uses only one IC. Can be useful in debugging hardware projects and machine code programs that cause the computer to crash by indicating where the CPU is after the crash. Supplied as bare PC board and schematic."
category:
  - name: "Miscellaneous"
    slug: "misc"
    taxonomy: "category"
    url: "http://localhost/category/hardware/misc/"
post_tag:
  - name: "John Oliger Co."
    slug: "john-oliger-co"
    taxonomy: "post_tag"
    url: "http://localhost/tag/john-oliger-co/"
  - name: "TS 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
  - name: "TS 2068"
    slug: "ts2068"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts2068/"
model:
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
    taxonomy: "model"
    url: "http://localhost/model/ts-1000/"
  - name: "Timex/Sinclair 2068"
    slug: "ts-2068"
    taxonomy: "model"
    url: "http://localhost/model/ts-2068/"
genre:
  - name: "Hardware"
    slug: "hardware"
    taxonomy: "genre"
    url: "http://localhost/type/hardware/"
  - name: "Miscellaneous hardware"
    slug: "miscellaneous-hardware"
    taxonomy: "genre"
    url: "http://localhost/type/miscellaneous-hardware/"
company:
  id: 10990
  title: "John Oliger Co."
  type: "company"
  url: "http://localhost/company/john-oliger-co/"
price: 9.95
rarity: "Uncommon"
related_content:
  - id: 35597
    title: "The John Oliger Co. Product Lists"
    type: "document"
    url: "http://localhost/document/the-john-oliger-co-product-lists/"
image_gallery:
  - url: "http://localhost/wp-content/uploads/2024/05/JLO-memory-monitor-red.jpg"
  - url: "http://localhost/wp-content/uploads/2024/05/JLO-memory-monitor-front.jpg"
companies_products:
  - id: 10990
    title: "John Oliger Co."
    type: "company"
    url: "http://localhost/company/john-oliger-co/"
---

# Memory Access Monitor

Eight LEDs indicate which bank of memory the Z80 is accessing. Uses only one IC. Can be useful in debugging hardware projects and machine code programs that cause the computer to crash by indicating where the CPU is after the crash. Supplied as bare PC board and schematic.