Page 1 of 1
Disk on a Chip ??
Posted: 05 Mar 2017 14:12
by lezanderson
The MD2800-D08-X DiskOnChip ( Emulates a Floppy Disk) ??
Hi.
Does anyone know much about this MD2800-D08-X DiskOnChip . An IC (available in DIP32) that I'm assuming is some form of Silicon Disk that Emulates an FDC+Floppy Drive ?
Datasheet :
http://www.qscomp.cz/Pdf/doc_2000.pdf
https://www.usbid.com/assets/datasheets ... ystems.pdf
May be possible to use this to make a small PCB/Circuit that could replace SDX module&Floppy Drive or maybe not ?
Best Regards
Lez
Re: Disk on a Chip ??
Posted: 09 Mar 2017 12:48
by Martin A
A quick look at the data sheet, it looks like this is a memory mapped device. It doesn't look like any sort of floppy replacement.
Re: Disk on a Chip ??
Posted: 18 Mar 2017 11:45
by lezanderson
I think it's supposed to replace the actual physical Floppy disk itself ? It would be connected to an FDC (floppy disc controller, uPD765 etc) via glue logic. So the system would just think it's a large floppy disc. This would have advantages in reliability, larger capacity and faster ?
Re: Disk on a Chip ??
Posted: 18 Mar 2017 15:32
by stephen_usher
It won't be much faster as the data transfer rate is fixed by the controller. The only speed-up would be due to the lack of with latency seeking track to track. The controller reads a whole track at a time (or waits a specific period for the sector to come around before starting to read). The drive itself does nothing to the data and is a dumb device.
Re: Disk on a Chip ??
Posted: 19 Mar 2017 12:30
by 1024MAK
All floppy disk systems that I have seen transfer data as a serial data stream via a single data line.
I think the devices in the first post are more like something that could be fitted to an embedded system to save having a small hard drive. The idea being that the BIOS (in ROM) could "boot" the system from such a chip, and then run a small application on the embedded system.
Mark