RAMGS/4-C00 - SIMM based 4MB memory expansion for the Apple IIgs
Submitted by GG on Sat, 03/19/2016 - 00:00A new version of this project is available here
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Retrocomputing
MACSIMM-A00 - Programmable ROM SIMM for Mac SE/30, IIfx and IIsi
Submitted by GG on Thu, 03/17/2016 - 00:30A new version of this project is available here
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RAMGS/8 - SIMM based 8MB memory expansion for the Apple IIgs
Submitted by GG on Sun, 02/28/2016 - 17:11A new version of this project is available here
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GTERM25-A00 - DB25 Active SCSI Terminator with diagnostics LEDs
Submitted by GG on Sat, 02/20/2016 - 11:02A new version of this project is available here
Active termination is required to get newer higher performance drives working on vintage computers. Unfortunately both the Amiga and older Apple computers use a DB25 SCSI connector which makes finding a suitable terminator quite difficult. GTERM25 solves this problem providing a high performance active terminator with a DB25 connector and SCSI diagnostic LEDs.
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A521HD - Commodore Amiga RGB to HDTV Component Adapter
Submitted by GG on Sun, 01/24/2016 - 17:38
The GGLABS A521HD is a high performance RGB to YPbPr converter to directly connect an HDTV with component inputs to the A2000/A3000/A4000. The A521HD plugs into the video slot of the big box Amiga.
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T232-A02 - Simple DB9 RS232 monitor and breakout board
Submitted by GG on Fri, 01/22/2016 - 15:25A new version of this project is available here
RS232 monitors are quite common but most of them use the standard good old DB25 connectors. The majority of the RS232 ports in use today however use the smaller 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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A520HD - Commodore Amiga RGB to HDTV Component Adapter
Submitted by GG on Fri, 01/15/2016 - 13:33
The GGLABS A520HD is the HDTV equivalent of the classic Commodore A520 TV modulator. Instead of encoding the Amiga video signal to a low quality composite output it converts the RGB output to a high quality YPbPr signal compatible with HDTVs with a component input. The A520HD connects to the Amiga 23-pin video port and is powered directly from the system.
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GLINK-LT-A02 - User Port RS232 for Commodore 8-bit Computers
Submitted by GG on Thu, 12/03/2015 - 15:50A 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.
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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.
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GS2HD - Apple IIgs RGB to HDTV Component Adapter
Submitted by GG on Tue, 11/24/2015 - 15:25
The 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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