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

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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

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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

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GTERM25-A01 - DB25 Active SCSI Terminator with diagnostics LEDs

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

A 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.