Tag: acia

2 matching upgrades

Showing 2 products.

Status Product What it does Compatibility Links

Status	Product	What it does	Compatibility	Links
Build itChecked Jul 30, 2026	Diag264 Diagnostic ROM and Harnessby Rob Clarke, with OpenC16Cart hardware by SukkoPera c16 plus 4 ted diagnostic cartridge diagnostic rom test harness loopback test ram test rom test keyboard test cassette port iec user port acia pal ntsc diy repair	DIY diagnostic ROM and loopback harness for PAL and NTSC Commodore 264-family computers. Rob Clarke's current download directory offered Diag264 0.97 on 2026-07-30. The maker also offers a programmed EPROM at media and postage cost by email. The software is CC BY-NC-ND 4.0: unmodified personal distribution with attribution is allowed, but modification and commercial resale are prohibited. The maker warns that some third-party marketplace copies were unauthorized or modified. Loopback hardware may be resold when the attribution conditions are met. Sources Rob Clarke Diag264 project and operating manual Diag264 current download directory SukkoPera OpenC16Cart project	Commodore 16 Exact model Commodore 116 Exact model Commodore Plus/4 Exact model Commodore V364 Exact model	Diag264 project and manual Download Diag264 0.97 Build the OpenC16Cart cartridge
Build itChecked Jul 24, 2026	SC705 Serial ACIA Moduleby Small Computer Central serial acia rc2014 rcbus io ports kit open hardware	Adds a clock-stable 68B50 serial port with TTL-level flow control. The project provides a schematic, Gerbers, PCB design files, and kit or bare-PCB suppliers; an assembled version is not offered. The serial-header power jumper must not connect two competing 5 V sources. Multiple SC705 modules require distinct I/O addresses. Sources SC705 Serial ACIA project page	RC2014 modular systems Bus/interface	Official project page

Build itChecked Jul 30, 2026

Diag264 Diagnostic ROM and Harnessby Rob Clarke, with OpenC16Cart hardware by SukkoPera

DIY diagnostic ROM and loopback harness for PAL and NTSC Commodore 264-family computers.

Rob Clarke's current download directory offered Diag264 0.97 on 2026-07-30. The maker also offers a programmed EPROM at media and postage cost by email. The software is CC BY-NC-ND 4.0: unmodified personal distribution with attribution is allowed, but modification and commercial resale are prohibited. The maker warns that some third-party marketplace copies were unauthorized or modified. Loopback hardware may be resold when the attribution conditions are met.

Sources

Commodore 16 Exact model
Commodore 116 Exact model
Commodore Plus/4 Exact model
Commodore V364 Exact model

Diag264 project and manual Download Diag264 0.97 Build the OpenC16Cart cartridge

Build itChecked Jul 24, 2026

SC705 Serial ACIA Moduleby Small Computer Central

Adds a clock-stable 68B50 serial port with TTL-level flow control.

The project provides a schematic, Gerbers, PCB design files, and kit or bare-PCB suppliers; an assembled version is not offered. The serial-header power jumper must not connect two competing 5 V sources. Multiple SC705 modules require distinct I/O addresses.

Sources

SC705 Serial ACIA project page

RC2014 modular systems Bus/interface

Official project page