Retrocomputing

CGA2RGB-B01 - Digital RGBI to analog RGB for Commodore 128 and IBM PC CGA

Submitted by GG on Mon, 04/10/2017 - 09:59

A new version of this project is available here

CGA2RGBThe 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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Retrocomputing
C64

F2R16-A00 - Flash based ROM Replacement for Amiga Computers

Submitted by GG on Tue, 02/21/2017 - 15:49

F2R16The 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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Retrocomputing
Amiga

CGA2RGB-B00 - Digital RGBI to analog RGB for Commodore 128 and IBM PC CGA

Submitted by GG on Wed, 02/01/2017 - 20:40

A new version of this project is available here

CGA2RGBThe 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.

Filed under: 
Retrocomputing
C64

CGA2RGB-A00 - Digital RGBI to analog RGB for Commodore 128 and IBM PC CGA

Submitted by GG on Tue, 11/15/2016 - 21:44

A new version of this project is available here

CGA2RGBThe 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.

Filed under: 
Retrocomputing
C64

GTERM25 - DB25 Active SCSI Terminator with diagnostics LEDs

Submitted by GG on Thu, 11/10/2016 - 22:59

GTERMActive 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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Retrocomputing
Apple
Amiga

RAMGS/4 - SIMM based 4MB memory expansion for the Apple IIgs

Submitted by GG on Tue, 05/10/2016 - 19:33

ramgsThe 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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Retrocomputing
Apple

E2R16 - 27C400 programming adapter for Minipro TL866

Submitted by GG on Sun, 03/27/2016 - 00:52

MiniproThe 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.

Filed under: 
Retrocomputing
Amiga

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