Search found 9 matches

by trossin
Tue Dec 09, 2014 8:09 pm
Forum: Hardware
Topic: How to get GEMDOS to use FAT16 instead of FAT12
Replies: 15
Views: 3167

Re: How to get GEMDOS to use FAT16 instead of FAT12

My web site moved to Google sites so I updated the links in my previous posts. The new link is included below:

https://www.sites.google.com/site/tedro ... cs/atarist
by trossin
Tue Dec 09, 2014 7:58 pm
Forum: News & Announcements
Topic: New web page with my Atari ST projects
Replies: 4
Views: 3901

Re: New web page with my Atari ST projects

My free net46 site is being held hostage for a monthly payment so I moved my site to Google sites.

https://www.sites.google.com/site/tedro ... cs/atarist

I updated the links in my previous post.
by trossin
Thu Oct 09, 2014 6:03 pm
Forum: News & Announcements
Topic: New web page with my Atari ST projects
Replies: 4
Views: 3901

New web page with my Atari ST projects

I added a page to my website with information about my 28 year old Atari 1040ST. https://www.sites.google.com/site/tedrossin/home/electronics/atarist My machine has been mostly broken for the last 15 years and last summer I brought it back to life with the help of a logic analyzer I just finished up...
by trossin
Tue Oct 07, 2014 1:52 am
Forum: Hardware
Topic: How to get GEMDOS to use FAT16 instead of FAT12
Replies: 15
Views: 3167

Re: How to get GEMDOS to use FAT16 instead of FAT12

I finished the first pass of the cartridge based RS-232 interface along with code to implement a serial disk drive and ftp server for windows and ftp client for TOS. The current code gets me near 50 KBytes/s transfer rates. The max rate I can hope for is about 90KBytes/s so I still have a few more t...
by trossin
Fri Sep 19, 2014 3:56 pm
Forum: Hardware
Topic: How to get GEMDOS to use FAT16 instead of FAT12
Replies: 15
Views: 3167

Re: How to get GEMDOS to use FAT16 instead of FAT12

This is all freeware stuff. It can be built using a Douglas Electronics protoboard $10, a $6.50 PIC, $2 for 3 TTL parts, and $15 for the FTDI USB to TTL cable. If you don't have a PIC programmer, that will cost another $35 or I can program up a part for the cost of shipping. Same goes for anyone who...
by trossin
Thu Sep 18, 2014 3:52 pm
Forum: Hardware
Topic: How to get GEMDOS to use FAT16 instead of FAT12
Replies: 15
Views: 3167

Re: How to get GEMDOS to use FAT16 instead of FAT12

Setting bit 0 of bflags did the trick to get FAT16. Thanks for the help. The ST Internals book from 20+ years back that I have had no information on that. I'm able to read and "write" to the cartridge port using the trick to pass the data on the address bus. Read data is returned from the ...
by trossin
Wed Sep 17, 2014 4:38 pm
Forum: Hardware
Topic: How to get GEMDOS to use FAT16 instead of FAT12
Replies: 15
Views: 3167

Re: How to get GEMDOS to use FAT16 instead of FAT12

Thanks for all the info and especially the bflag = 1 secret. I'll give it a try tonight.

I attached the schematic for my interface so that I can leave this post in hardware. I have not soldered up the SD connector yet but that is next on my list of fun.
by trossin
Wed Sep 17, 2014 4:38 pm
Forum: Hardware
Topic: How to get GEMDOS to use FAT16 instead of FAT12
Replies: 15
Views: 3167

Re: How to get GEMDOS to use FAT16 instead of FAT12

See next one. Bad refresh.
by trossin
Wed Sep 17, 2014 2:02 am
Forum: Hardware
Topic: How to get GEMDOS to use FAT16 instead of FAT12
Replies: 15
Views: 3167

How to get GEMDOS to use FAT16 instead of FAT12

I've been away from my ST for about 20 years and brought it back to life back in July (had to pull out a socket and resolder the 68K back in) and started working on a little cartridge interface for "fast" RS-232 to my PC. I put a Microchip 18F2620 along with a FTDI USB to TTL cable running...

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