---
title: "ZXAS"
id: 14822
type: "product"
slug: "zxas"
url: "http://localhost/product/zxas/"
markdown_url: "http://localhost/product/zxas.md"
published_at: "2019-11-30T01:13:01+00:00"
modified_at: "2026-03-22T13:41:35+00:00"
author: "David Anderson"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Learn and program in machine code the easy way with this powerful Z80 assembler, commissioned specially for the ZX80 & ZX81. Standard Z80 mnemonics are simply written into REM statements within your BASIC program. The assembly listings, together with addresses and assembled codes are displayed on the screen when assembled. The assembled code is executed…"
category:
  - name: "Programming"
    slug: "programming"
    taxonomy: "category"
    url: "http://localhost/category/software/programming/"
post_tag:
  - name: "Bug-Byte Software"
    slug: "bug-byte-software"
    taxonomy: "post_tag"
    url: "http://localhost/tag/bug-byte-software/"
  - name: "Downloadable"
    slug: "downloadable"
    taxonomy: "post_tag"
    url: "http://localhost/tag/downloadable/"
  - name: "Gladstone Electronics"
    slug: "gladstone-electronics"
    taxonomy: "post_tag"
    url: "http://localhost/tag/gladstone-electronics/"
  - 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/"
  - name: "ZX81"
    slug: "zx81"
    taxonomy: "post_tag"
    url: "http://localhost/tag/zx81/"
model:
  - 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/"
genre:
  - name: "Programming"
    slug: "programming"
    taxonomy: "genre"
    url: "http://localhost/type/programming/"
  - name: "Software"
    slug: "software"
    taxonomy: "genre"
    url: "http://localhost/type/software/"
company:
  id: 10706
  title: "Bug-Byte Software"
  type: "company"
  url: "http://localhost/company/bug-byte-software/"
model_2: "1981"
price: 9.95
rarity: "Uncommon"
product_reviews:
  - id: 62249
    title: "Simple Mods for ZXAS & ZXDB"
    type: "article"
    url: "http://localhost/article/simple-mods-for-zxas-zxdb/"
  - id: 62300
    title: "More Mods to the ZXAS-ZXDB"
    type: "article"
    url: "http://localhost/article/more-mods-to-the-zxas-zxdb/"
adverts:
  - publication:
      - id: 26639
        title: "SYNC v1 n5"
        type: "issue"
        url: "http://localhost/issue/sync-v1-n5/"
    advert_page: "8"
related_products:
  - id: 51827
    title: "ZXAS"
    type: "computer_media"
    url: "http://localhost/computer_media/zxas/"
companies_products:
  - id: 10706
    title: "Bug-Byte Software"
    type: "company"
    url: "http://localhost/company/bug-byte-software/"
  - id: 10902
    title: "Gladstone Electronics"
    type: "company"
    url: "http://localhost/company/gladstone-electronics/"
---

# ZXAS

Learn and program in machine code the easy way with this powerful Z80 assembler, commissioned specially for the ZX80 & ZX81. Standard Z80 mnemonics are simply written into REM statements within your BASIC program. The assembly listings, together with addresses and assembled codes are displayed on the screen when assembled. The assembled code is executed with the USR function. The program uses 5K of memory and is protected from overwriting. Full documentation, including examples, is supplied with the cassette. 16K.