---
title: "Bank Switching for the ZX81"
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published_at: "2026-01-19T13:39:27+00:00"
modified_at: "2026-01-19T13:39:41+00:00"
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excerpt: "There was a time when 64K of memory was more than enough. No longer is this true and a common complaint heard about small computers like the ZX81/TS1000 and the Commodore 64 is that their memory is too limited and that the computers are therefore unsuitable for \"serious applications\". The problem is particularly acute for…"
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pubdate: "January 1985"
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---

# Bank Switching for the ZX81

There was a time when 64K of memory was more than enough. No longer is this true and a common complaint heard about small computers like the ZX81/TS1000 and the Commodore 64 is that their memory is too limited and that the computers are therefore unsuitable for “serious applications”. The problem is particularly acute for the ZX81/TS1000 in which the active BASIC program area is limited to the region between 16K and 32K because of compromises made in the hardware design.