C64

CGA2RGB-A00 - Digital RGBI to analog RGB for Commodore 128 and IBM PC CGA

Submitted by GG on Tue, 11/15/2016 - 21:44

A new version of this project is available here

The 80 column output of the Commodore 128 is the same digital RGBI used by the original IBM CGA graphics adapter. Unfortunately nowadays is quite difficult to find a monitor with the suitable RGBI input. The CGA2RGB adapter will convert the TTL RGBI to analog RGB suitable to be connected directly to a 15KHz capable RGB monitor or to the popular Gonbes GBS-8200 VGA converter.

Filed under:

Retrocomputing

C64

GLINK-LT-A02 - User Port RS232 for Commodore 8-bit Computers

Submitted by GG on Thu, 12/03/2015 - 15:50

A new version of this project is available here

GLINK-LT is a modern clone of the Commodore VIC-1011A RS232 User Port adapter for Commodore 8-bit computers. The adapter is fully supported by the standard Commodore BASIC at up to 2400 baud. Jumpers allow the card to be configured as a UP9600 for 9600 baud operation in Novaterm and Striketerm. A reset button is also provided for added convenience.

Filed under:

Retrocomputing

C64

GLINK232 - UART cartridge for Commodore 64/128

Submitted by GG on Tue, 12/01/2015 - 18:01

Both the commodore 64 and the 128 have a software UART implementation that limits the useful speed to 2400 bauds. To work around this limitation Dr. Evil Labs and later CMD produced the SwiftLink232 and Turbo232 cartridges based on the 6551 ACIA chip. Both of these have been out of production for a very long time. GLINK232 is a modern replacement for the swiftlink232 allowing the commodore 64/128 to communicate at speeds up to 38400 bauds.

Filed under:

Retrocomputing

C64

GRAM/512S-A00 - 512KB geoRAM clone for Commodore 64/128

Submitted by GG on Wed, 05/20/2015 - 19:37

A new version of this project is available here

The geoRAM is a 512KB memory expansion for the Commodore 64 and 128 designed by Berkeley Softworks for use with GEOS. While not as fast as the Commodore REU due to its lack of DMA capabilities, it still provides a significant performance boost. GRAM/512S is a geoRAM compatible cartridge based on a single 512Kx8 SRAM.