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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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Latest articles

Amiga Floppy

Canada Post sucks

So I made the mistake of having an Amiga book shipped from Canada using Canada Post Expedited USA shipping. It was dropped off at a post office on Nov. 17th in Mississauga, Ontario. Now Mississauga is about 300 miles...

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Amiga Floppy

reworking my uart

Well I rewrote my recv and send uart, and with the help of my logic analyzer, I’ve tuned them up pretty good. I’m getting some transfer errors, somehow, and I think its related to buffer size. I read a disk...

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Amiga Floppy

Parallel port access in win 2k

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75 views

Amiga Floppy

mid-january status

So here’s where I’m at: I know my memory read and write routines are good. I calculate a checksum as I’m writing the data, and on the output of that data to the PC, I also calculate the checksum. ...

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Amiga Floppy

first day back

You know, I always hate the “first day back” working on a project. Things always seem to get screwed up between the time I last worked on a project, and that day. Even if nothing has changed. Or so I say...

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A501 Replacement

Finished wiring of the prototype, hooked it up

So I finished cabling up the solderless breadboard, and after checking connections, and checking pwr and gnd, I plugged it into the amiga. The amiga boots, which is a good sign, but then it never recognizes the memory. ...

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Amiga Floppy

Schmitt Trigger

Welp, after talking with some smart guys on forums.parallax.com, it looks like the Schmitt Trigger feature on the SX is going to allow me to get rid of my 74HC132 that I’ve spent at least a couple hours messing...

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Amiga Floppy

updated code and comments

Here’s a current version of the code. I cleaned up my code tonight, added a bunch of comments, and tried to explain and document what I’m doing and the logic behind it. The current code is so much better...

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A501 Replacement Inactive

Found problems with incorrect footprints used for some chips

So I received all of the SMT parts today, and attempted to verify that I’ve used the right footprints for the parts. This was a worthwhile effort because I found a few different problems. Also, digi-key shipped me...

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Amiga Floppy

SX problem is double-ones, ISR code & description

While I shouldn’t be surprised, my SX hardware issue is related to double one’s, where the SX sees transitions back to back, and writes back to back 1’s into memory. This is assuming there aren’t...

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