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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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Amiga Floppy

minor success at 2:00am

well I’ve got MFM flowing from the PC drive now. A couple of things: Pins 10 and 14, the pins I’ve been using since last night, appear to be correct. Pin 10 is the motor lead. Dropping a corresponding SX...

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Amiga Floppy

Found another UART timing issue

Ok. A post or two back, I mentioned that I wanted to rework the receive UART because it wasn’t working perfect. I fixed that, and now it’s reliably receiving. I also mentioned that my sending uart code was...

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Amiga Floppy

Good news good news. First perfect .adf

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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 Inactive

finally got some memory working on the FPGA

So since I first picked up this Xilinx Spartan-3E starter kit evaluation board, I’ve been trying to get some memory working on the FPGA. The DDR is as elusive as beast as I can find. I’ve not yet given up...

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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

man am I a slacker

Yeah, I’ve been slacking lately on the project. School has been keeping me busy, work too. My current problem is that something seems up with the data checksum routine, the code on the PC that is processing the...

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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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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

new isr thoughts

While this new ISR is indeed easier to understand and much more simple, I can’t help but remember what else my ISR used to do for me. The four things I really lose are: 1> Any type of double 1’s protection...

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