Hi Guys, I'm looking for documentation or an example of the raw track format for a TRS-80 model III disk - or more specifically - a NEWDOS/80 (bootable) SD or ...
Hi Guys, Does anyone have any info on how the WD179x actually decides when it has found an idam or dam on a track? Does it use the gap filler bytes & counts ...
... During the format, when you present the preamble to the IDAM or DAM ($F5) to the controller it won't write the clock transisition between bits 4 & 5. ... ...
... I think the lead in parts (=preamble=gap filler) are just patterns that will help the controller in detecting the IDAM/DAM and could theoretically be...
... Thanks Tim, Knut for your comments. ... Interesting. That will present a problem of sorts for me... see following... ... Reading the 179x datasheet, my...
FWIW, there is a long thread I started titled "Using a PIC as a floppy disk controller" on news:sci.electronics.design in '06 which might be worth a peek. Neil...
... Checked it out Neil, thanks. Noticed there was also some (erroneous) info on the Commodore 1541 drive as well. I've had some experience emulating this in ...
... Just finished simulating interrupts and READ_SECTOR command. Looked OK so I tried it out on real silicon... no go. :( Not surprised, I still have a few...
I just felt that a 20 MHz PIC or similar might be able to emulate an FDC. This would give a source of floppy controllers. Neil ... From: Mark McDougall Checked...
... track ... other GAP ... can't vary ... That matches my experience. GAP2 has to be exact but there is much more leeway for the other gaps. According to the...
... Right now I'm using jv2dmk to create the raw disk images so it's not so much of a problem, though at some stage I'd like to be able to read copy-protected...
... Hmmm, probably need a little more CPU bandwidth I'm guessing atm... coincidently my FPGA implementation is clocked at 20MHz but of course that's clocking...
... That is why I thinking of the 16bit 80MHz XE164. It has two features that would help a lot in reading real disks. The PEC, a DMA like feature used with...
I am almost positive that I have one. Let me check and see if it is in one of my books. ... Hi, Anyone know if there's a (commented) disassembly of the Model...
... OK, thanks. I've just disassembled the disk boot execution path, so I may not require it so urgently. But regardless, it is something that I'd definitely...
Woo hoo! Got NEWDOS/80 booting on my Model III FPGA implementation! Thanks to all that pitched in answering my queries! Now to finish adding support.. (after I...
... I was going to play a few games until I discovered that supporting a 2nd drive required more functionality than I had implemented - for example the ...
Another question I've been pondering... How does the controller sync the byte framing with the incoming serial stream? Is there an inter-byte gap with no RCLK?...
... That's really slick. Have you given any thought of building some kind of 17nn controller replacement that could live on a daughter board that would fit...
... Not so much a 17xx replacement, but a floppy drive replacement (much like SVD) I think would be more useful?!? Are there systems out there with dead 17xx's...
... I have had problems getting DD kits and EI's for my machines. BTW also original Tandy powersupplies for 220V... (3 model 1s and 3 Video Genies. One model 1...
Hi Guys, I'm pleased to announce that I have multiple drives working on my FPGA Model III/WD179x implementation! Naturally the Big Five Software games were the...
Hi Guys, *This is going to the three TRS-80 groups I'm a member of so apologies if you get this message more than once* Disk deterioration problems saw me lose...
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