Is there a currently working way to boot from this interface without a floppy? I was thinking of adding a CompactFlash interface to a Model 1 keyboard (no...
Hi James, With this interface no. While the interface in the IDE drive is similar to the WD controllers used in the original Radio Shack hard drives it is not...
That's kinda what I figured. Bank switching ROMs would let you put all the emulation in Z80 code and skip the micro-controller. It would work something like...
... without a ... In a word, no. The Mod 1 BASIC ROM knows of nothing except cassette and if an Expansion Interface is present, how to look for a floppy boot...
... What it does, Model I Level II, if you don't hold down break, is to: Read memory location 37ECh (FDC status) If it get FFh or 00h it will go to ROM basic. ...
My idea to use a Microcontroller was that I already have all the AVR code I need to interface to an SD card and handle the FAT file system. Thanks Knut for the...
Hmmmm... that could be implemented with a very simple counter/state machine and a ROM. 37ECh always returns ready. The write addresses just do nothing. Each...
The drive/cylindar/sector registers could be used as registers for higher addresses of larger ROMs. With a 128x8 or 256x8 ROM you could fit an entire DOS +...
I'm not an EE guy but I was thinking of how to implement this. A latch should serve as the registers for drive/cylindar/sector if I remember right. 74F373 or...
If the lines don't settle fast enough with the counter triggered by the read, there is an alternative. Reading the status could trigger the counter to...
FYI, not for one of the Roman Numeral models, but we're working on a MMU (1K granularity) +(soldered down industrial) flash and RAM memory for the TRS-80 Model...
The main thing about the mod we're talking about is that it's really just a hack based on the TRS-80 floppy controller behavior. It doesn't require changes to...
I've been looking for source code for accessing the FAT file system, IDE interfaces to 8 bit computers and Compact Flash related stuff. I think the IDE Test...
... Kenneth Pettit is working on a battery-powered stand-alone RS232 interfaced CF/MMC reader/writer called "TacDrive." It implements an extended version of...
The hi-res graphics circuit is from 80 Microcomputing 04/1981 It's one of the issues that's not online and my copy is pretty tattered. I need to hunt down the...
... After looking over this design I think the best approace would be to modify it by adding the latches to make it a 16 bit interface. That is required for...
If I haven't already posted it, here is a PDF of TCJ articles about an 8-bit ATA IDE controller for Z80: http://bitchin100.com/8bit_ide.zip And this site has a...
... With these hardware modifications, you just described the G-IDE interface (http://www.iee.et.tu-dresden.de/~kc-club/gide/gide.html). BTW, I am planning to...
Except for that whole $60+ thing even though you have to assemble it yourself. Sure it's configurable but it's ONLY the IDE port and doesn't support booting...
Fred, If you want them I can send the source code for the TRSIDE drivers for LDOS 6 (if they are not in IDE.DSK on my web site... honestly it is so long since...
Folks, the TEAC 360K 5 1/4 floppy drives have arrived and are new as noted previously. (NOS) There are 3 still available, first come first served, as many as...
We sold a number of these to realtors, to access the old dial up MLS they used back then. 300 Baud acoustic modem in the cover, thermal paper. Those were the...
... I have the IDE.DSK image and made a disk, but have yet to modify my original model 4p to work with double sided disks. The hardware is no problem, but my ...
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