---
title: "Disk Board A"
id: 12377
type: "product"
slug: "disk-board-a"
url: "http://localhost/product/disk-board-a/"
markdown_url: "http://localhost/product/disk-board-a.md"
published_at: "2019-11-30T01:42:57+00:00"
modified_at: "2026-03-22T13:13:30+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Disk drive interface that used the WD1770 drive controller. Supported up to four disk drives."
category:
  - name: "Disk Drive Systems"
    slug: "disk-other"
    taxonomy: "category"
    url: "http://localhost/category/hardware/disk-other/"
post_tag:
  - name: "John Oliger Co."
    slug: "john-oliger-co"
    taxonomy: "post_tag"
    url: "http://localhost/tag/john-oliger-co/"
  - 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: "Disk Drive Systems"
    slug: "disk-drive-systems"
    taxonomy: "genre"
    url: "http://localhost/type/disk-drive-systems/"
  - name: "Hardware"
    slug: "hardware"
    taxonomy: "genre"
    url: "http://localhost/type/hardware/"
company:
  id: 10990
  title: "John Oliger Co."
  type: "company"
  url: "http://localhost/company/john-oliger-co/"
price: 66.95
rarity: "Uncommon"
related_content:
  - id: 53255
    title: "Preliminary Information on the Oliger/Kingsley Disc System"
    type: "document"
    url: "http://localhost/document/preliminary-information-on-the-oliger-kingsley-disc-system/"
  - id: 38512
    title: "JLO 2068 Floppy Disk Interface"
    type: "document"
    url: "http://localhost/document/jlo-2068-floppy-disk-interface/"
  - id: 35594
    title: "Future Commands Planned for JLO SAFE V2"
    type: "document"
    url: "http://localhost/document/future-commands-planned-for-jlo-safe-v2/"
  - id: 12378
    title: "Disk Board B with NMI Save"
    type: "product"
    url: "http://localhost/product/disk-board-b-with-nmi-save/"
adverts:
  - publication:
      - id: 26461
        title: "Update July 1988"
        type: "issue"
        url: "http://localhost/issue/ts-2068-up-date-july-1988/"
    advert_page: "48"
companies_products:
  - id: 10990
    title: "John Oliger Co."
    type: "company"
    url: "http://localhost/company/john-oliger-co/"
---

# Disk Board A

Disk drive interface that used the [WD1770](https://en.wikipedia.org/wiki/Western_Digital_FD1771) drive controller. Supported up to four disk drives.

## Notes

https://worldofspectrum.org/faq/reference/ports.htm
<ul>
 	<li><strong>Peripheral</strong>: JLO (Status/Command).
<strong>Port</strong>: <tt>---- ---- 1000 1111</tt></li>
 	<li><strong>Peripheral</strong>: JLO (Track).
<strong>Port</strong>: <tt>---- ---- 1001 1111</tt></li>
 	<li><strong>Peripheral</strong>: JLO (Sector).
<strong>Port</strong>: <tt>---- ---- 1010 1111</tt></li>
 	<li><strong>Peripheral</strong>: JLO (Data).
<strong>Port</strong>: <tt>---- ---- 1011 1111</tt></li>
 	<li><strong>Peripheral</strong>: JLO (Select).
<strong>Port</strong>: <tt>---- ---- 1011 0111</tt></li>
</ul>