# Byte Adder Subtractor

An 8-bit full adder, with accumulator to store one operand. Do addition and subtraction, with the 8-bit Workbench™ and a Binary Keyboard.

- **Seller:** [8BitFlux.com](https://lectronz.com/stores/8bitflux-store), Hengevelde, Netherlands
- **Price:** €20.95 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Retrocomputing, Kits, Technology
- **HS code:** 85429000
- **Product page:** https://lectronz.com/products/byte-adder-subtractor

## Options

**SAT-service (Solder, Assemble & Test)**

- No thanks, that's all the fun.
- Yes, please do! [Add €10.00]

## Links

- [Documentation](https://8bitflux.com/downloads/bas-quick-start.pdf)
- [Schematics](https://8bitflux.com/downloads/bas-schematics.pdf)
- [Bom](https://8bitflux.com/downloads/bas-bom.pdf)

## Images

![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MDcsInB1ciI6ImJsb2JfaWQifX0=--dff1511712860b57a1134449ac4b25ee45c6957e/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-frontal.jpg)
![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MTEsInB1ciI6ImJsb2JfaWQifX0=--6935951357ed0f440f38eccd261d6000566c2982/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-in-use-hk.jpg)
![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MTUsInB1ciI6ImJsb2JfaWQifX0=--ec43db9ff26dcc4f43eb4840332ea1992d73051d/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-zoom-accumulator.jpg)
![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MTksInB1ciI6ImJsb2JfaWQifX0=--9e24586d3b5204c2c1a2966201dd4e25291832f2/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-zoom-carry-in.jpg)
![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MjMsInB1ciI6ImJsb2JfaWQifX0=--0e455b2afab24d88a78f194ee828150968d97180/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-in-use-bk-8bw.jpg)
![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MjcsInB1ciI6ImJsb2JfaWQifX0=--25f106597c6ed7a47c489e962b4ff4ded6c4c15b/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-with-hk-8bw.jpg)
![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MzEsInB1ciI6ImJsb2JfaWQifX0=--cbe31f15804d5fc8bacb1537f52d4beef20507c1/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-back-pcb.jpg)
![Byte Adder Subtractor](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTY5MzUsInB1ciI6ImJsb2JfaWQifX0=--caf36ec2facb1de72a09a9e1d13e9bdc6942d1f1/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/bas-parts.jpg)

## Description

Gain understanding of the inner workings of an *Arithmetic Logic Unit (ALU)*, one of the building blocks of processors. Control the **one-byte storage** of the accumulator using the *load* and *clear* buttons. Get feeling with the adder-concept, all *carries* are visualized using small LEDs. While the **carry-in** can be set using the slide switch, the **carry-out** LED indicates a byte overflow.

Subtraction can be done using the *method of complements*, as explained in the Quick Start documentation. Jumpers can be set to externalize control of the accumulator, i.e. tie load and clear to the action- or clock-signal. Use the DIP-switch to turn off the *intermediate-carry* or separate the adder into two **4-bit adders**.

The [**8-bit Workbench™**](https://lectronz.com/products/-8-bit-workbench) can be attached at the top. With this you have an annotated 8-bits binary LED display. It talks hexadecimal and octal. A clicky Digitast action-button provides a properly debounced signal for use with microprocessors. With it you can further learn about logic and see how number systems work. For binary data-input, a [**Binary Keyboard**](https://lectronz.com/products/binary-keyboard) can be attached at the bottom. This provides a joyfull toggle experience for 8-bit data input. Instead, use the [**Hex Keyboard**](https://lectronz.com/products/hex-keyboard) to input a hexadecimal value directly.

Extend and combine this Byte Adder Subtractor with our **[other kits](https://lectronz.com/stores/8bitflux-store)** to learn and do (vintage) computer experiments. [Visit our store](https://lectronz.com/stores/8bitflux-store) to get more information on those products. 

Buy three or more connecting 8-bit Workbench™ kits and receive a **15% discount**. Use the code 8BW-KIT-DEAL in your cart.

See the documentation for details. Questions? Just ask!

## Shipping policy

- Shipping is tracked (you receive the tracking number), unless impossible to your country.
- For USA: package can be tracked with USPS as soon as it is in your country. USA shipping rates include all import duties, which are paid by me (the seller).
- No insurance, my experience is this is a farce anyway.
- Item ships within 3 business days (unless the item is a pre-order campaign, check its duration and lead time).
- Delivery is usually done within 10-15 business days, but may rarely take 4 weeks.