# SC505 RTC & I2C Card Kit for Z50Bus

A dual function Z50Bus card providing a real-time clock and an I2C bus master

- **Seller:** [Small Computer Central](https://lectronz.com/stores/s-c-central), Stowmarket, England, UK
- **Price:** $23.00 (USD, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Retrocomputing, Kits
- **HS code:** 854290
- **Product page:** https://lectronz.com/products/sc505-rtc-i2c-card-kit-for-z50bus

## Options

**Printed circuit board colour**

- Black
- Red
- Blue
- Green
- White

## Links

- [Documentation](https://smallcomputercentral.com/)

## Images

![SC505 RTC & I2C Card Kit for Z50Bus](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTg4OTMsInB1ciI6ImJsb2JfaWQifX0=--90cdb34e286691b662e9d17daac24b9f10d96cc5/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/SC505%20-%20Assembled%20-%203x2.jpg)
![SC505 RTC & I2C Card Kit for Z50Bus](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTg4OTcsInB1ciI6ImJsb2JfaWQifX0=--a25734f387bbf82370677083a74625f6f0522daf/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/SC505%20-%20PCB%20colours%20-%203x2.jpg)
![SC505 RTC & I2C Card Kit for Z50Bus](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTg5MDEsInB1ciI6ImJsb2JfaWQifX0=--067339750076699aed93f7054b898032b0fd7ae5/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/SC501+502+503+506%20-%20Black%202%20-%203x2.jpg)
![SC505 RTC & I2C Card Kit for Z50Bus](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MTkyNDQsInB1ciI6ImJsb2JfaWQifX0=--aa85aab51a48db60524aacee59badf0d8bfa2b23/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/SC505%20-%20Render%20-%20black%20-%20t%20x2.jpg)

## Description

This card adds a real-time clock/calendar and an I2C bus master to the Z50Bus.

The main features are:

- Z50Bus card measuring approximately 100mm x 75mm (4″ x 3″)
- Real-time clock (RTC) using DS1302+ integrated circuit
- I2C bus master for 5-volt I2C devices
- Configurable I/O address with tight address decoding
- LED indicators to show the state of the I2C signals
- A variety of I2C bus connections (both male and female)
- Spare I/O lines available via header pins
- Jumpers to allow I2C signals to use the bus USER pins

The I2C bus is compatible with many 5-volt I2C devices, including the SC400 range of I2C modules.

The real-time clock is supported by RomWBW firmware. RomWBW runs on SC503 Z180 processor card for Z50Bus.

The kit contains everything you need to build this Z50Bus card, except a CR2032 battery, solder, tools, and cleaning materials.

### Documentation

The documentation can be found at [www.smallcomputercentral.com](https://smallcomputercentral.com/)

### Related items

- SC505 - Printed circuit board on its own
- SC501 - 7-slot backplane for Z50Bus
- SC502 - Power, reset, and status card for Z50Bus
- SC503 - Z180 processor card for Z50Bus
- SC504 - Compact Flash Interface Card for Z50Bus
- SC506 - Digital I/O Card for Z50Bus
- SC138 - I2C memory card
- Components, spares, and accessories

### Notes

- This product is supplied as a kit of parts that require assembly.
- It is your responsibility to pay any import duty or taxes charged by your home country.
- This design is made with the permission of LiNC (designers of the Z50Bus).
- This product is designed for hobby use and is not suitable for industrial, commercial, or safety-critical applications.
- RomWBW has been provided free of charge by its author Wayne Warthen.

## Shipping policy

Products usually ship within 3 days