Tag: avr

An external fifteen-ROM selector for original Sinclair 48K, 128K, and grey +2 computers, controlled by one button and binary indicator LEDs.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and explicitly limits support to original Sinclair 48K, 128K, and grey +2 machines. Power off before connecting or removing it. Confirm the exact ROM contents and any software licensing from the current unit rather than assuming every example named on the board is supplied or redistributable.

Adds a PS/2 or PS/2-compatible USB keyboard to a ZX Spectrum 48K or Spectrum+ through an internal keyboard-interface board.

The seller exposed a login-or-register-to-buy path on 2026-07-27. It explicitly targets the 48K and Spectrum+ and warns that the original keyboard may stop working while the adapter is installed. The two signal modes use different motherboard signals; select the documented jumper state for the exact board and change hardware only with power removed. A USB keyboard works only if it supports the PS/2 protocol through its connector.

Current Lotharek redesign of the compact AVR-based replacement for a Commodore 64 SID sound chip.

The Lotharek page exposed a login-or-register-to-buy path on 2026-07-27. The independent nano SwinSIDb tutorial documents the reference design's settings: its J1 selects 6581 filtering when closed and 8580 when open, while J2 enables an output-load resistor for 8580 boards and is left open for 6581 boards. It also says the design lacks paddle analog inputs and external audio input. The seller does not state that its dual DIP switch maps identically, so obtain Lotharek-specific switch and orientation instructions before installation. The latest firmware identified by the tutorial is dated 2012; original development stalled, and the reconstructed archive warns that one unreleased firmware can glitch.

Compact SwinSID-derived 6581 or 8580 replacement with hardware mode selection and a higher audio-output level.

Tindie showed 10 units in stock at USD 38.88 on 2026-07-28, while AMI64 listed the same family at GBP 49. Tindie's extracted page gave contradictory US shipping information, so confirm destination eligibility before ordering. X-SID does not support paddles or a mouse, and neither seller publishes technical, firmware, or installation documentation.