Retrocomputing

GLINK232T - Turbo232 UART cartridge for Commodore 64/128

Submitted by GG on Tue, 01/15/2019 - 09:53

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. GLINK232T is a modern replacement for the CMD Turbo232 allowing the commodore 64/128 to communicate at speeds up to 230400 bauds.

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Retrocomputing

C64

GGLABS Memory Test V0.41

Submitted by GG on Sat, 11/03/2018 - 19:01

A new version of GMT is available here

GMT (GGLABS Memory Test) is a new developed memory test for vintage computers optimized for speed and coverage. The code is based on the test algorithms described in "Testing Semiconductor Memories: Theory and Practice" by A.J. van de Goor. The program is mostly in C plus small sections in assembly. It is free software and released under the GPL v3 license.

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Retrocomputing

Apple

C64

GRAM/4D-D02 - 4MB geoRAM Compatible RAM Expansion for Commodore 64/128

Submitted by GG on Sun, 09/02/2018 - 10:41

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/4D is a 4MB geoRAM compatible cartridge based on a two 4Mx4 DRAM devices.

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Retrocomputing

C64

GLINK232T-C00 - Turbo232 UART cartridge for Commodore 64/128

Submitted by GG on Tue, 08/28/2018 - 22:00

A new version of this project is available here

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Retrocomputing

C64

RAMGS/8 - small form factor 8MB memory expansion for the Apple IIgs

Submitted by GG on Tue, 05/15/2018 - 01:58

The apple IIgs is the most advanced computer in the Apple II series. Equipped with a 65c816 8/16-bit CPU with 24-bit address space it could address up to 16MB of memory. The original rom 01 model shipped with 256KB of fast RAM, the revised rom 3 shipped with 1MB (both had an additional 128KB of standard RAM and 64KB of sound RAM). RAMGS is a newly designed 8MB expansion card for this great classic computer.

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Retrocomputing

Apple

GRAM/4D-D01 - 4MB geoRAM Compatible RAM Expansion for Commodore 64/128

Submitted by GG on Sun, 05/06/2018 - 17:12

A new version of this project is available here

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Retrocomputing

C64

E2R16v2.1 - 27C400/800/160/322 programming adapter for Minipro TL866

Submitted by GG on Mon, 03/26/2018 - 17:44

A new version of this project is available here

The Minipro TL866 is very popular among hobbyist because of its low price and ease of use. Its list of supported chips is however somewhat limited compared to more expensive professional programmers. The E2R16v2 adapter adds support for the ROM pinout compatible EPROM of the 27C400/800/160 and C322 series.

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Retrocomputing

GLINK-LT-B00 - User Port RS232 for Commodore 8-bit Computers

Submitted by GG on Tue, 03/20/2018 - 00:00

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 and a 5V header are also provided for added convenience.