Oh. To my surprise, people have been talking about the Symbiosys/6522IDE code...

After working with Zen on the Symbiosys project, I built a VIC20 expansion board with dual 6522s, one of which controlled a CF Card with the 8-bit ATA/IDE. I've just put code online at: https://notabug.org/vk2cjb/VIC20 ...

Bugga, too late to the party, I suppose.

No.

https://en.wikipedia.org/wiki/Derivativ ... equirement

Something I've done was to calculate checksums of each page of memory, twice, and see if they were equal. This was viable on the particular hardware (a VIC-20 with a homebrew RAM, EPROM, and two-VIA expansion), where unconnected addresses returned semi-random values on a read, and the VIAs didn't ...

I've actually just been playing with Convolutional Coding, in an Amateur Radio 'weak signal mode' context-- the basic technique that /replaced/ Reed-Solomon on the Voyager space probes (mid-way into the mission!)

The encoder is very very easy-- input bits are logically shifted through several ...

I've also implemented a filesystem from scratch for CF (and large IDE) storage.

It was very, very simple, but still quite functional, and the DOS wrapped around it fit into 1kB ROM space on a VIC-20. (source available on request...)

The storage is organized in 64kB blocks -- the first being the ...

The HP35s (the 2007 35th anniversary model) has a SPLB31A SunPlus 6502-derivative CPU core inside its ASIC SoC...

I am trying to repair my Yamaha HS-5 organ which uses an M50734 and would really appreciate help to disassemble the 128k x 8 rom file that I have in binary or Intel hex format. I contributed the M50734 support in cc65-- a quick attempt to disassemble the binary you've got can be done with:

da65 ...

The sxb.py program works well, thanks.

I found a document which has this to say about the protocol... [...] ...that's where it was. >_>

It doesn't mention the structure for the payload used for CMD #4 set-internal-registers. From my own look at the dissembled wdcmon, it is maintained in $7E00 ...

Success! https://imgur.com/a/Ds1hQDa

An alpha release of the sxb.py Python is attached.

>The extension py is not allowed.

Bite on this, phpBB

Some progress on this to report...

I've successfully brute-forced what the protocol was [for z in range(256): for y in range(256): for x in range(256): ser.write(chr(x)+chr(y)+chr(z) ... and watching for responses], and determined the general command syntax:

command : <$55> <$AA> {listen for $CC ...

You could write a replacement ROM upload it into the flash using my hacker program [...] You missed that I have no programmatic access to the board.

If it gets to the point of bothering with the Flash, I'd be dumping the firmware and reverse-engineering the protocol that TIDE uses-- which it doesn ...

I decided to grab up one of the W65C816SXB boards before they disappear forever... Unfortunately, I forgot to do my usual technology check and didn't investigate their compatibility with the FOSS/GNU world, and I'm discovering that TIDE interface is not a tried-and-true serial monitor, or at least ...

I've encountered this CPU as well-- it's the 10MHz 6502 in the Commodore MPS-1250 printer. The great Lee Davidson helped me figure out the instructions, and then we disassembled the '1250 ROM. From that effort, I submitted a patch to the cc65 maintainer, and da65 does support this CPU.

The best I ...

A high-school friend of mine, Marc Walters (of the "how many C64s were made" fame :) interviewed Melbourne House developers for Australian Commodore Review. I recall him mentioning the use of IBM-XTs, with an in-house expansion board that uploaded/bootstrapped (also modified) C64s via the User port ...