Retrocomputing

GLINK232 - UART cartridge for Commodore 64/128

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

glink232Both 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.

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Retrocomputing
C64

GS2HD - Apple IIgs RGB to HDTV Component Adapter

Submitted by GG on Tue, 11/24/2015 - 15:25

GS2HD D00The apple IIgs, like many computers from the 80's and early 90's, has a analog RGB output at a 15KHz horizontal frequency (same as NTSC/PAL). The majority of modern monitors and TVs will not sync to anything below 31.5KHz on their VGA input. If you have a TV with a SCART connector it is possible to wire the RGB directly to the TV. Most TVs in USA, however, use the YPbPr component instead of SCART making a direct connection not possible.

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Retrocomputing
Apple

T232-A01 - Simple DB9 RS232 monitor and breakout board

Submitted by GG on Thu, 05/28/2015 - 16:10

A new version of this project is available here

T232RS232 monitors are quite common but most of them use the standard good old DB25 connectors. Most of the RS232 ports in use today however use the DB9 connector. This forces the use chains of adapters to get the commercial monitor/breakout boards working. The GGLABS T232 solves the problem by providing native DB9 connections.

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Retrocomputing
MCU
Linux
Windows

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

geoRAMThe 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.

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Retrocomputing
C64

GLINK-LT-A00 - User Port RS232 for Commodore 8-bit Computers

Submitted by GG on Sat, 04/18/2015 - 00:52

A new version of this project is available here

glink232GLINK-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

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