GandALF, substitute for the MOS 325572-01

Discuss anything related to the VIC

Moderator: Moderators

eslapion
ultimate expander
Posts: 4136
Joined: Fri Jun 23, 2006 7:50 pm
Location: Canada
Occupation: 8bit addict

Re: GandALF, substitute for the MOS 325572-01

Postby eslapion » Fri Aug 11, 2017 9:07 pm

cbmeeks wrote:My original point was that I was surprised that a drop-in replacement for the VIC-1 or VIC-2 haven't been done (yes, with FPGA) because the C64 and VIC-20 are so popular in the retro scene.

I am not surprised at all.

Last year, Sylvain, Fredric and i did develop a replacement for the 6526/8520/8521 CIA used in the C64, C128, C128D, 1571, 1581 and Amiga line of computers. This is probably a chip replacement which would be popular because it is used in a bunch of devices and computers Commodore made.

Cloning the CIA requires more than 200 macrocells and we were able to fit it in a pair of XC95144XL of 100 pins each. The size of these chips (sorry I can't solder the BGA form factor) is about 15mm wide and a pair of them required a larger board than can fit over a 40 pin DIP socket.

With the 2 CPLDs, the board, the 40 pin header and the work involved, the cost per unit to the customer of such a contraption was around 45$US per unit. Nobody would buy that.

I can easily imagine a VIC-I replacement costing around 90$US per unit and double that for the VIC-II. It is a near certitude this replacement will be slightly bigger than the original chip (as is the case with the TMS replacement) and this certainly cause some problems.

Before somebody invests thousands of dollars to develop this sort of product, one has to think how long it will take, if ever, to recover your investment and profit from it.
No one can do everything. Everyone can do something.

groepaz
Vic 20 Nerd
Posts: 538
Joined: Wed Aug 25, 2010 5:30 pm

Re: GandALF, substitute for the MOS 325572-01

Postby groepaz » Sat Aug 12, 2017 10:13 am

Last year, Sylvain, Fredric and i did develop a replacement for the 6526/8520/8521 CIA used in the C64, C128, C128D, 1571, 1581 and Amiga line of computers.

sounds like something jimmy would write 8)

eslapion
ultimate expander
Posts: 4136
Joined: Fri Jun 23, 2006 7:50 pm
Location: Canada
Occupation: 8bit addict

Re: GandALF, substitute for the MOS 325572-01

Postby eslapion » Sat Aug 12, 2017 1:18 pm

groepaz wrote:
Last year, Sylvain, Fredric and i did develop a replacement for the 6526/8520/8521 CIA used in the C64, C128, C128D, 1571, 1581 and Amiga line of computers.

sounds like something jimmy would write 8)

Are you insinuating it does not exist ?

If you are, I consider your post as trolling.

The project's name was CIAnide.
No one can do everything. Everyone can do something.

User avatar
Mayhem
High Bidder
Posts: 2755
Joined: Mon May 24, 2004 7:03 am
Website: http://www.mayhem64.co.uk
Location: London

Re: GandALF, substitute for the MOS 325572-01

Postby Mayhem » Sat Aug 12, 2017 1:48 pm

Now even I've heard of that from posts elsewhere...
Lie with passion and be forever damned...

eslapion
ultimate expander
Posts: 4136
Joined: Fri Jun 23, 2006 7:50 pm
Location: Canada
Occupation: 8bit addict

Re: GandALF, substitute for the MOS 325572-01

Postby eslapion » Wed Aug 16, 2017 10:53 pm

From Ray Carlsen:
Francois,
I'm happy to report that your module works fine. I ran two
drives and copied whole disks and then individual files back and
forth, first with a copy program in a stock drive and then with
JiffyDOS installed which runs faster and is more critical of
misalignment and other problems. I found no difference between
GandALF and the stock controller chip. The programs I copied fill
virtually all of a disk and thus check drive operation at the
disk track limits. For most computer and drive diagnostics, test
software and firmware is fine but I prefer to "test it in combat"
in a real world setup. I's say your chip is ready for prime time.
Thanks! :-)


Ray
No one can do everything. Everyone can do something.


Return to “General Topics”

Who is online

Users browsing this forum: No registered users and 3 guests