Apple

GZ/80 - Zilog Z80 card for Apple II computers

Submitted by GG on Sat, 01/19/2019 - 14:15

The Microsoft Softcard was the first card to allow CP/M software to run on the Apple II. It was originally developed to simplify the porting of Microsoft Basic to the Apple II. It turned out to be a great success and at some point in time it was the most popular CP/M platform in use.
This success prompted the development of many compatible cards. Some exact copies, some enhanced or cost reduced. The GZ/80 is a modern implementation of a Softcard compatible card.

Filed under:

Retrocomputing

Apple

GGLABS Memory Test V0.41

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

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.

Filed under:

Retrocomputing

Apple

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.

Filed under:

Retrocomputing

Apple

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.

Filed under:

Retrocomputing

Apple

MACSIMM - Programmable ROM SIMM for Mac SE/30, IIfx and IIsi

Submitted by GG on Thu, 05/25/2017 - 18:46

The Mac SE/30 was the fastest of the classic compact black and white Macintosh computers. It featured a 16MHz 68030 with 68882 FPU and a 32-bit memory interface and supported, albeit not officially, up to 128MB of RAM. Unfortunately the SE/30 ROM contained some old code that used 24-bit addressing making it 32-bit dirty. Many classic computer enthusiasts make their SE/30 32-bit clean by installing a Mac IIsi ROM SIMM. These are nowadays quite rare and difficult to find.

Filed under:

Retrocomputing

Apple

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.

Filed under:

Retrocomputing

Apple

Amiga

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.