---
title: "Lambda 8300"
id: "25808"
type: "page"
slug: "lambda-8300"
published_at: "2020-07-03T18:37:43+00:00"
modified_at: "2025-04-16T01:10:22+00:00"
url: "http://localhost/computers/lambda-8300/"
markdown_url: "http://localhost/computers/lambda-8300.md"
excerpt: "The Lambda 8300, which was widely available in the States as the PC8300, was a clone of the Sinclair ZX81."
---

The [Lambda 8300](https://en.wikipedia.org/wiki/Lambda_8300)
, which was widely available in the States as the PC8300, was a clone of the Sinclair ZX81.

Fred Nachbaur was an ardent supporter of the PC8300 and [developed a ROM](/product/pc8300-timex-rom/)
 that made it “90% Timex-compatible.”

### Hardware

### ROM

NameDescriptionComputers[PC8300 Timex ROM](/product/pc8300-timex-rom/)
[Silicon Mountain Computers](/company/silicon-mountain-computers/)

Custom adaptation of the Timex/Sinclair 1000 ROM for the Lambda 8300 computer. Adapted by Fred Nachbaur, the replacement EPROM came in a 2764, a 28-pin device (several additional pins were necessary for programming EPROMs). The PC8300 ROM was a 24-pin 8K ROM. In order to fit the replacement EPROM to the PC8300, several pins wereLambda 8300, Downloadable### Articles

- [16K - Fitting it "Under the Hood"](/article/16k-fitting-it-under-the-hood/)
- [A Letter From Fred Nachbaur (concerning the PC8300 "Timex Clone")](/article/a-letter-from-fred-nachbaur-concerning-the-pc8300-timex-clone/)
- [Bits & Bytes](/article/bits-bytes-46/)
- [Bits & Pieces](/article/bits-pieces-18/)
- [Bits & Pieces](/article/bits-pieces-19/)
- [Bits & Pieces](/article/bits-pieces-25/)
- [Forum](/article/forum-13/)
- [Hardware Review: IQ-8300 / PC-8300](/article/hardware-review-iq-8300-pc-8300/)
- [Incredible Add-On Device Turns TS1000, ZX81 and PC8300 Into Versatile and User Friendly Computers](/article/incredible-add-on-device-turns-ts1000-zx81-and-pc8300-into-versatile-and-user-friendly-computers/)
- [Inside the PC 8300](/article/inside-the-pc-8300/)
- [Letter from John Stewart](/article/letter-from-john-stewart/)
- [More on the PC8300](/article/more-on-the-pc8300/)
- [New, News, Views and Reviews](/article/new-news-views-and-reviews-4/)
- [News From the Dealers](/article/news-from-the-dealers/)
- [PC 8300 Circuit Board and Schematic](/article/pc-8300-circuit-board-and-schematic/)
- [PC 8300 Interfacing Alert](/article/pc-8300-interfacing-alert/)
- [PC-8300 Interfacing Alert](/article/pc-8300-interfacing-alert-2/)
- [PC8300 - Magic or Madness](/article/pc8300-magic-or-madness/)
- [PC8300 Preliminary Technical Report](/article/pc8300-preliminary-technical-report/)
- [PC8300 ROM Upgrade](/article/pc8300-rom-upgrade/)
- [PC8300 ZX81/TS1000 Clone Hardware Examination](/article/pc8300-zx81-ts1000-clone-hardware-examination/)
- [PC8300: ZX81 Clone Is It Magic or Madness?](/article/pc8300-zx81-clone-is-it-magic-or-madness/)
- [Product Review: PC8300](/article/product-review-pc8300/)
- [Puzzle](/article/puzzle/)
- [Space Cannon](/article/space-cannon/)
- [The Musical PC8300](/article/the-musical-pc8300/)
- [The PC 8300 Computer (Part 3: RAM Pack and Color Adaptor)](/article/the-pc-8300-computer-part-3-ram-pack-and-color-adaptor/)
- [The PC 8300 Computer, Part 2: Software Use and Compatibility](/article/the-pc-8300-computer-part-2-software-use-and-compatibility/)
- [The PC8300 Computer](/article/the-pc8300-computer/)
- [The PC8300: A Clone of the T/S1000, Part 2](/article/the-pc8300-a-clone-of-the-t-s1000-part-2/)
- [The PC8300: First Thoughts](/article/the-pc8300-first-thoughts/)
- [Timex 1000 Clone](/article/timex-1000-clone-2/)
- [Timex 1000 Clone](/article/timex-1000-clone/)
- [Timex 1000 Clone](/article/timex-1000-clone-3/)
- [Timex Tidbits](/article/timex-tidbits/)
- [Timex Tidbits](/article/timex-tidbits-8/)
- [Timex Tidbits](/article/timex-tidbits-7/)
- [Timex Tidbits](/article/timex-tidbits-6/)
- [Timex Tidbits](/article/timex-tidbits-5/)
- [Timex, Sinclair, and the Clones](/article/timex-sinclair-and-the-clones-3/)
- [Timex, Sinclair, and the Clones](/article/timex-sinclair-and-the-clones-2/)
- [TS1000 Clone Hardware Analysis](/article/ts1000-clone-hardware-analysis/)
- [TYD*BYTS](/article/tydbyts-2/)
- [Using the PC8300 with 64K RAM Packs](/article/using-the-pc8300-with-64k-ram-packs/)
- [ZX-81/TS1000 Clone: The PC8300](/article/zx-81-ts1000-clone-the-pc8300/)
- [ZX81-T/S1000-T/S1500 Clone: The PC8300](/article/zx81-t-s1000-t-s1500-clone-the-pc8300/)