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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...

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Circle of HOPE 2018 presentation on HomeBrew 68K retro-computing

I delivered a presentation at Hackers On Planet Earth in July 2018 in New York City. For a few different reasons, that presentation was cut short. I decided to rerecord the delivery of the presentation and make it...

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Badge Computer

Fixed point number formats: might use 16.16

So for my fixed point number format for my 3D project, I’ve come up with a few possibilities : I think a 16.16 number format might work for me. This means I’ll represent the whole portion via one 68k word...

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Badge Computer

3D Wireframe Rotation dreams…

So I’d really like to be able to rotate 3D objects using this computer. There’s some problems though that make it a little harder than normal. The 68000 doesn’t have any integrated Floating Point...

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Badge Computer

Adding Yamaha YM2612 support has begun

So after much time talking about it, and doing research, I’ve finally got around to spending some time on adding Yamaha YM2612 support to the badge computer. I created a small verilog driver that read the...

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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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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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OT: Century III Mall, not quite a dead mall, but sure heading that way

Century III Mall is an ailing enclosed shopping mall located in the southern Pittsburgh suburb of West Mifflin, Pennsylvania. I lived nearby this mall, and this was definitely “our” mall for kids like me...

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Amiga Floppy

logic analyzer on Amiga 500 Paula chip

So I’ve attached my Intronix LA1034 to the Paula chip, the 16-bit wide data bus, and the DMA Request line. I triggered the logic analyzer on 0x4489, of course. Here’s the results: (click for a full size...

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Badge Computer

Learning the YM2612 with a Sega Genesis Model 1

I’m planning on using the Yamaha YM2612 FM synthesizer chip that has been used in both keyboard synthesizers, but also in the Sega Genesis consoles. The purpose is to add audio capability to my DIY Tablet computer...

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inital results on error correction

Popular stories

Circle of HOPE 2018 presentation on HomeBrew 68K retro-computing

Fixed point number formats: might use 16.16

3D Wireframe Rotation dreams…

Adding Yamaha YM2612 support has begun

Popular galleries

Popular videos

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

OT: Century III Mall, not quite a dead mall, but sure heading that way

logic analyzer on Amiga 500 Paula chip

Learning the YM2612 with a Sega Genesis Model 1