GLINKUSB-LT-C01 - User Port RS232 to USB for Commodore 8-bit Computers
Submitted by GG on Tue, 03/21/2017 - 14:11A new version of this project is available here
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Retrocomputing
F2R16-A00 - Flash based ROM Replacement for Amiga Computers
Submitted by GG on Tue, 02/21/2017 - 15:49
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.
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GLINKUSB-LT-C00 - User Port RS232 to USB for Commodore 8-bit Computers
Submitted by GG on Sat, 02/04/2017 - 18:11A new version of this project is available here
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CGA2RGB-B00 - Digital RGBI to analog RGB for Commodore 128 and IBM PC CGA
Submitted by GG on Wed, 02/01/2017 - 20:40A 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.
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CGA2RGB-A00 - Digital RGBI to analog RGB for Commodore 128 and IBM PC CGA
Submitted by GG on Tue, 11/15/2016 - 21:44A 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.
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GTERM25 - DB25 Active SCSI Terminator with diagnostics LEDs
Submitted by GG on Thu, 11/10/2016 - 22:59
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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RAMGS/4 - SIMM based 4MB memory expansion for the Apple IIgs
Submitted by GG on Tue, 05/10/2016 - 19:33
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/4 is a newly designed 4MB SIMM based memory expansion card for this great classic computer.
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E2R16 - 27C400 programming adapter for Minipro TL866
Submitted by GG on Sun, 03/27/2016 - 00:52
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 E2R16 adapter adds support for the ROM pinout compatible EPROM of the 27C400 series which are compatible with Amiga computers and many arcade machines.
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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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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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