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Amiga Floppy

inital results on error correction

While I have yet to actually implement the full-scale error correction as I want to, I did some manual tests today. I basically took a track that I was erroring out on, and swapped in 1-bit away values for the bad bytes. In some cases, it appeared...

keith

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Corrosion near/underneath HP Logic Analyzer module plastic runners

The problem is corrosion….. Corrosion appears to be happening either directly under or nearby the various sized (but typically 5″ long) plastic runners that line the bottom of the large PCB modules. These...

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Oscilloscopes and Logic Analyzers

Effects of upgrading SCSI2SD from v5 (4.8.3) to v6 (6.2.1) analysis HP 16700A

If you compare this graph with the previous one in this post, there’s a few things you should notice: First, the overall boot is happening about 1 minute quicker, with a fully loaded chassis coming in around 2:35...

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Oscilloscopes and Logic Analyzers

16700A internals w/ SCSI2SD v3.0 installed

See my fan upgrade post here on quieting those noisy fans.
See my DIY logic analyzer cart here.
Here’s a couple closeups of the SCSI2SD in action:

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Reading Amiga Kickstart ROMs with a TL866A reader

I recently bought a TL866A from ebay with a bunch of adapters for a little under $100 shipped. Seems like a decent programmer except for the fact that it doesn’t support the 27C200/27C400 mask ROMs that hold...

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$28 Gonbes GBS8200 Scandoubler for use with Commodore Amiga

While I probably would have preferred to order an Indivision ECS scan doubler, a really nice alternative is a Gonbes GBS8200 video converter off of ebay. I had bought version 2.0 sometime in 2010 or 2011, and could not...

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Commodore Amiga Related

On building an A500++

Commodore Amiga 500 Plus In the 1980s, Commodore made a newer version of their very popular Amiga 500, called the Amiga 500 Plus. It added a few things, namely newer versions of Kickstart and Workbench — both 2...

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Amiga Floppy

floppy.c’s mfm decoder

A couple days ago, whenever I got ahold of floppy.c, I wrote a quickie code stub that utilizes floppySectorMfmDecode from floppy.c of fellow (). Note you must use the mirrors to actually download anything…. This...

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Amiga Floppy

Samsung SFD-321B 3.5″ floppy drive and specifications

I plan to create a separate section for these type of documents, but I wanted to get this online for now. I purchased the Samsung (made by SEMA, the division split off of Samsung that mostly makes floppy drives) SFD...

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Amiga Floppy

how the amiga reads floppies

So I’ve forever wondered, at the hardware level, how the amiga reads floppy disks. I’ve gotten bits and pieces over the years, but I’ve never really understood the bulk of it. So there are four main...

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A501 Replacement Inactive

Schematics now available for A501 replacement card

Schematics now available for A501 replacement card!
Find them on the main project page, located here.

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Trying to use mini-box picoPSU-120 to power Amiga but -12v rail is out of ATX compliance

So I purchased a mini-box picoPSU-120 kit which is in essence a very very small power supply that provides multiple regulated voltages. I want to power my Commodore Amiga 500 with the tiny power supply but there’s...

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Badge Computer

Watching YM2612 communication on Sega Genesis

I did buy a compatible 24-pin DIP clip to make it a little easier, and a little bit more reliable, to hook up the logic analyzer. The YM2612 sits on the Z80 Bus, and so there’s lots of communication not intended...

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Amiga Floppy Amiga-VSC Inactive

Bug Katcher on Agnus

I swear I already posted about this but heck if I can find the post. Anyways, here’s a photo of a bug katcher installed on Agnus on a Commodore Amiga 500. This gives me the ability to attach a logic analyzer to...

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inital results on error correction

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Corrosion near/underneath HP Logic Analyzer module plastic runners

Effects of upgrading SCSI2SD from v5 (4.8.3) to v6 (6.2.1) analysis HP 16700A

16700A internals w/ SCSI2SD v3.0 installed

Popular galleries

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Latest articles

Reading Amiga Kickstart ROMs with a TL866A reader

$28 Gonbes GBS8200 Scandoubler for use with Commodore Amiga

floppy.c’s mfm decoder

Samsung SFD-321B 3.5″ floppy drive and specifications

how the amiga reads floppies

Schematics now available for A501 replacement card

Trying to use mini-box picoPSU-120 to power Amiga but -12v rail is out of ATX compliance

Watching YM2612 communication on Sega Genesis

Bug Katcher on Agnus