---
title: "Dear Editor"
type: "article"
slug: "dear-editor-43"
url: "http://localhost/article/dear-editor-43/"
markdown_url: "http://localhost/article/dear-editor-43.md"
published_at: "2026-03-13T00:24:42+00:00"
modified_at: "2026-03-13T00:24:43+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Letters covering: FAST/SLOW mode switching in machine code monitors (Clark Calkins, answered by KO); expanding ZX81 on-board RAM to 2K using Fujitsu MB8416 static RAM (William Jordan); disabling SPACE-key interruption and CONT screen clearing (C. Alfred Spencer, answered by KO); explanation of Syntactic Sum meaning (Julian Goldman); Syntactic Sum FAST mode requirement and SAVE anomaly…"
category:
  - name: "Syntax"
    slug: "syntax"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/syntax/"
post_tag:
  - name: "MicroAce"
    slug: "microace"
    taxonomy: "post_tag"
    url: "http://localhost/tag/microace/"
  - name: "TS 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
  - name: "ZX80"
    slug: "zx80"
    taxonomy: "post_tag"
    url: "http://localhost/tag/zx80/"
model:
  - name: "MicroAce"
    slug: "microace"
    taxonomy: "model"
    url: "http://localhost/model/microace/"
  - name: "Sinclair ZX80"
    slug: "zx80"
    taxonomy: "model"
    url: "http://localhost/model/zx80/"
  - name: "Sinclair ZX81"
    slug: "zx81"
    taxonomy: "model"
    url: "http://localhost/model/zx81/"
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
    taxonomy: "model"
    url: "http://localhost/model/ts-1000/"
publication_r:
  id: 10246
  title: "Syntax"
  type: "periodical"
  url: "http://localhost/periodical/syntax/"
volume: "3"
issue: "7"
issues_articles:
  - id: 52481
    title: "Syntax/Syntax ZX80 v3 n7"
    type: "issue"
    url: "http://localhost/issue/syntax-syntax-zx80-v3-n7/"
pages: "12"
pubdate: "July 1982"
archive_link: false
---

# Dear Editor

Letters covering: FAST/SLOW mode switching in machine code monitors (Clark Calkins, answered by KO); expanding ZX81 on-board RAM to 2K using Fujitsu MB8416 static RAM (William Jordan); disabling SPACE-key interruption and CONT screen clearing (C. Alfred Spencer, answered by KO); explanation of Syntactic Sum meaning (Julian Goldman); Syntactic Sum FAST mode requirement and SAVE anomaly on ZX81 (Fred Nachbaur); working on SLOW mode add-on for MicroAce (Jason Harper).