With a long background in developing for the Z80 based SAM Coupe computer it was due to several suggestions that I started to bring my knowledge to developing for the RC2014, so thanks to David who asked if I could make an interface to allow RC2014 peripherals to connect to the SAM, and Shiela who asked if my SAM Coupe SID Soundchip Interface happened to work with the RC2014! Thanks to them I'm now enjoying developing for a new, but familiar, platform! If there's any peripheral you'd like to see for the RC2014 drop me a suggestion!

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Scroll down to see the released interfaces or use these quick links:

- SID Interface (June 2020)(8580 SID Adapter option added 01/11/20)
- Graphics OLED Interface (July 2020) (New video + Twitter links added 21/08/20)

This interface connects to a standard RC2014 slot and allows the Z80 to write to the registers of the SID chip. To assist timing I've also added an interrupt generator which can be set to generate approximately 50/60/100Hz interrupts (timed to match the frame rate of the Commodore 64). There are jumpers on the interface to allow the base I/O address to be configured, with the default set to 0x54.

The sound output is via a stereo 3.5mm socket on the side of the interface into which you would then connect an amplified speaker. With the SID output being mono the same signal is fed to both the left and right channels.

Please note that the interface is supplied without a SID soundchip - you'll have to fit your own SID chip. As there are two types of SID (6581 - from the original C64, and the 8580 from the redesigned new-look C64C) the interface has to be built up specifically for the chip that is going to be fitted due to different supply voltages and filter capacitors. When purchasing below please select the type of chip you would like the interface configured for.

(01/11/20 Update!) I've now released an adapter to allow a 8580 SID to be connected to hardware designed for the 6581 so I can provide a solution to allow you to use either SID type with this interface. I've added an option in the Buy Now drop down menu for the SID Interface configured for the 6581 plus the 8580 Adapter module bundled in with it. (Also available separately here: 8580.samcoupe.com)

The interface also supports modern SID replacements, I've used the SwinSID, SwinSID Ultimate and the ARMSID myself. These operate independantly of the power circuitry and filter capacitors and the likes of the SwinSID Ultimate and ARMSID can be configured by software as to what chip type they are emulating, as well as advanced filter settings in the case of the ARMSID.

Currently, there's no specific software for the RC2014 to drive the interface, so please don't purchase the interface and think you'll be playing SID music within seconds! Programming information with regards to how to write to the SID's registers and enabling the interrupt controller is covered in the guide with the interface along with some Z80 routines. There is Z80 code on github (as originally written for the Z80 based SAM Coupe) for emulating the C64's 6510 CPU to play .sid files, someone could rise to the challenge of porting that to the RC2014!

As software appears for the interface I'll link it, or have it downloadable, from the resources section below, along with links to anything else that's interesting.

Please select from the drop down menu the shipping area (UK, EU countries, or Rest of World) and click 'Buy Now' for checkout through PayPal (either using your PayPal account or as a guest for payment by credit/debit cards.)

Please also select in the drop down options if you wish the interface to be configured for the 6581 or 8580 SID chip, or if you wish the 6581 version with the 8580 SID Adapter included to allow the interface to use both types.

Configuration + Extras + Shipping

6581, + UK Shipping (£5.99) £55.98 GBP 6581, + EU Shipping (£11.99) £61.98 GBP 6581, + Worldwide Shipping (£15.99) £65.98 GBP 8580, + UK Shipping (£5.99) £55.98 GBP 8580, + EU Shipping (£11.99) £61.98 GBP 8580, + Worldwide Shipping (£15.99) £65.98 GBP 6581, + 8580 SID Adapter (£14.99) + UK Ship (£5.99) £70.97 GBP 6581, + 8580 SID Adapter (£14.99) + EU Ship (£11.99) £76.97 GBP 6581, + 8580 SID Adapter (£14.99) + Worldwide Ship (£15.99) £80.97 GBP

I decided to go the OLED route rather than LCD as there are some nice very benefits. There's no backlight or contrast issues. More importantly, instant transition of pixels from off to on and vice versa, rather than the often very slow (and too blurry for animation) response time you generally find with small LCD modules.

A graphic module also gives far more scope in terms of possiblities and uses than an alphanumeric display. A simple text display using it can be easily achieved with a little bit of coding. I'm finishing off some routines for this, see the media section below for an image with my current text display code.

The user guide I've written explains how to initialise and write to the display, with Z80 source code examples. As just mentioned, I'm working on routines for easy text printing which I'll add to the download section below when ready.

Test assembly code for displaying text. Using a 6x8 pixel font gives 4 rows of 21 characters on the display, with the font (for ASCII characters 0x20 to 0x7F) taking up 576 bytes.