---
title: "Checker: A short Lesson on SPDOS"
type: "article"
slug: "checker-a-short-lesson-on-spdos"
url: "http://localhost/article/checker-a-short-lesson-on-spdos/"
markdown_url: "http://localhost/article/checker-a-short-lesson-on-spdos.md"
published_at: "2020-10-27T17:13:35+00:00"
modified_at: "2024-05-26T13:18:36+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "The SPDOS system call is one that checks for a filename's existence on a disk. If you try to load a file that is not on your disk, SPDOS will create an error that cannot be trapped by the usual ON ERR GOTO."
category:
  - name: "Update Magazine"
    slug: "update-magazine"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/update-magazine/"
post_tag:
  - name: "RAMEX International"
    slug: "ramex-international"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ramex-international/"
  - name: "SPDOS"
    slug: "spdos"
    taxonomy: "post_tag"
    url: "http://localhost/tag/spdos/"
  - name: "TS 2068"
    slug: "ts2068"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts2068/"
  - name: "Type-in program"
    slug: "type-in-program"
    taxonomy: "post_tag"
    url: "http://localhost/tag/type-in-program/"
model:
  - name: "Timex/Sinclair 2068"
    slug: "ts-2068"
    taxonomy: "model"
    url: "http://localhost/model/ts-2068/"
indiv:
  - name: "Munson Cockayne"
    slug: "munson-cockayne"
    taxonomy: "indiv"
    url: "http://localhost/indiv/munson-cockayne/"
publication: "TS-2068 Up-date"
publication_r:
  id: 10283
  title: "Update Magazine"
  type: "periodical"
  url: "http://localhost/periodical/update-magazine/"
authors: "Munson Cockayne"
issues_articles:
  - id: 26483
    title: "Update April 1988"
    type: "issue"
    url: "http://localhost/issue/ts-2068-up-date-april-1988-2/"
pages: "40"
pubdate: "April 1988"
related_articles:
  - id: 23070
    title: "SPDOS"
    type: "article"
    url: "http://localhost/article/spdos/"
  - id: 22722
    title: "SPDOS or yet another T/S 2068 disk DOS"
    type: "article"
    url: "http://localhost/article/spdos-or-yet-another-t-s-2068-disk-dos/"
  - id: 21648
    title: "SPDOS for North America"
    type: "article"
    url: "http://localhost/article/spdos-for-north-america/"
  - id: 21604
    title: "A Little About Me"
    type: "article"
    url: "http://localhost/article/a-little-about-me/"
  - id: 21698
    title: "How Goes It, Update?"
    type: "article"
    url: "http://localhost/article/how-goes-it-update/"
archive_link: false
volumeissue: "v1n3"
companies_articles:
  - id: 11214
    title: "RAMEX International"
    type: "company"
    url: "http://localhost/company/ramex-international/"
---

# Checker: A short Lesson on SPDOS

The SPDOS system call is one that checks for a filename’s existence on a disk. If you try to load a file that is not on your disk, SPDOS will create an error that cannot be trapped by the usual ON ERR GOTO.