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.

Filed under:

Retrocomputing

C64

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

Submitted by GG on Sat, 02/24/2018 - 00:41

Filed under:

Retrocomputing

C64

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

Submitted by GG on Tue, 02/20/2018 - 17:56

A new version of this project is available here

Filed under:

Retrocomputing

Apple

GGLABS Memory Test V0.33

Submitted by GG on Sun, 01/28/2018 - 17:48

A new version of GMT is available here

GMT (GGLABS Memory Test) is a new developed memory test for the Apple IIgs 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

GRAM/1D - 1MB geoRAM clone for Commodore 64/128

Submitted by GG on Thu, 01/18/2018 - 16:12

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/1D is a 1MB geoRAM compatible cartridge based on a two 1Mx4 DRAM devices.

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Retrocomputing

C64

GRAM/1D-C00 - 1MB geoRAM clone for Commodore 64/128

Submitted by GG on Thu, 11/30/2017 - 15:54

A new version of this project is available here

Filed under:

Retrocomputing

C64

E2R16v2 - 27C400/800/160 programming adaptor for Minipro TL866

Submitted by GG on Wed, 11/15/2017 - 01:53

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

Retrochallenge 2017/10

Submitted by GG on Fri, 10/06/2017 - 14:55

This year our staff decided to enter the retrochallenge competition. Our goal is to reverse engineer the Berkely softworks geoRAM and publish what we discover under the GPL. The geoRAM is a 512KB memory expansion for the Commodore 64 and 128. Unlike the Commodore 1750 REU, which contain a custom chip, the geoRAM is built completely out of standard TTL chips.

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Retrocomputing

C64

GLINKUSB-LT - User Port RS232 to USB for Commodore 8-bit Computers

Submitted by GG on Fri, 08/25/2017 - 17:55

GLINKUSB-LT is a modern variation of the Commodore VIC-1011. Instead of providing a legacy 12V RS232 connection, it provides a USB Virtual Com Port (VCP) suitable for direct connection to any modern PC. 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

F2R16-A01 - Flash based ROM Replacement for Amiga Computers

Submitted by GG on Thu, 06/15/2017 - 02:49

A new version of this project is available here

The Amiga, like many other computers of the late 80s, uses 16-bit wide mask ROMs to store the machine firmware. Unfortunately, the pinout of these ROMs is incompatible with the JEDEC defined EPROM pinout. Memory manufacturers produced "ROM compatible" EPROMS like the 27C400 to allow development and quick turn manufacturing. These EPROMS are however becoming quite hard to find and still require a UV lamp to erase the chips. F2R16 brings all the benefits of modern flash memory technology to any platform designed to use these obsolete devices.