techtravels.org

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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ISSI memory chip mounted

So I can’t believe how freakin’ tiny those pins are coming off the memory chip.  The pads on the surfboard were huge by comparison.  I actually thought there was a manufacturing defect on the memory chip and...

Parts ordered for the A501 replacement card

I placed an order yesterday for some prototyping parts to get this project off the ground. Some of the key parts are: ISSI 256kx16 SRAM chips. IC SRAM 4MBIT 25NS 44TSOP A surfboard to do 44-pin TSOP II to DIP.  Wish me...

Armiga Project

Here’s a cool project that I have some involvement with, the Armiga Project. This is basically an ARM-based emulation platform for the Amiga 500 that uses normal Commodore Amiga floppy disks! Pretty cool, and I...

Anatomy of a flux transition

I wanted to put up an image that displays an actual flux transition pulse coming off an amiga floppy disk whose data was encoded in MFM.

CLICK ON THE IMAGE TO DISPLAY A FULL RES VERSION.

working cause of bit errors

I think I’ve stumbled on something. I don’t think I’m capturing enough data. 13,824 has been my magic number forever.  It was larger than the 13,800 that Marco used in afr.c.  But I’m beginning...