Need TR-DOS firmware — ZXNet «hardware.zx»

From Andrew Borisov To All 18 January 2007

Hello, The Exploited I woke up after the New Year holidays! :))) I picked up the Spectrum again. I just can't beat the disk drive controller. (The Spectrum itself works.) Help me find a more or less clear description of how the controller works. I just can’t get it to go to TR-DOS using RANDOMIZE USR 15616. I checked all connections 10 times. I threw out the AP6 (buffer) and installed jumpers. ROM Winbond W27C512-45, BASIC and TR-DOS are written there, switching from 4 legs DD11 by address signal A14. DD8 trigger works. by command USR 15616 is reset to 0 (9th leg). Help! Maybe there is an error in the circuit? May need improvements to Leningrad 1 (Zonovsky version) And in general it is not clear how to exit to TR-DOS in the position switch "OFF" on 1 leg DD2 is given "0" and accordingly DD2 will not work work?

From Andrew Borisov To All 19 January 2007

Hello andrew76 Damn! Well, really, no one can help?

From Ivan Shishkin To All 19 January 2007

Hello andrew76 I picked up the kit that I wrote about above (without synchronization). Today I'll get to him in the evening. I'll check one idea. Very hard from memory the same case as yours emerges: with usr 15616 trdos picture rolls out (scrolls) from bottom to top. I assume that this may be the case Incorrect IORQ/outIORQ connection. Or at least with some of control signals between zx and beta disk. and> And in general it is not clear how to exit to TR-DOS when position and> of the "OFF" switch on 1 leg DD2 is given "0" and, accordingly, DD2 and> won't work? and the switch exists to disable the beta disk.

From Andrew Borisov To All 19 January 2007

Hello, Ivan > I picked up the set that I wrote about above (without synchronization). > I'll get to it this evening. I'll check one idea. Very hard from > memory the same case as yours emerges: with usr 15616 > the trdos image is rolled out (scrolled) from bottom to top. I guess > what this can happen if the IORQ/outIORQ connection is incorrect. Or by > at least with some of the control signals between zx and beta disk. > > and the switch exists to disable beta disk. In the description on BEtA DISK it is clearly written that access to TR-Dos is possible at any switch position. Only when "ON" does the exit to TR-Dos occur after resetting the computer, and when "OFF" possible according to USR 51616. :)

From Andrew Borisov To All 19 January 2007

Hello John North Joh> 15616 ? Well, I was wrong. And it’s also clear that 15616

From Vasya Popov To All 19 January 2007

Hello, andrew76 and> 51616. 15616 ?

From Vasya Popov To All 20 January 2007

Hello andrew76 and> Well, I was wrong. And it’s also clear that 15616 Yes, I'm not out of malice :)

From Ivan Shishkin To All 20 January 2007

Hello andrew76 My version with IORQ was not confirmed. and> In the description on BEtA DISK it is clearly written that access to TR-Dos is possible and> for any switch position Exactly. I'm sorry, I forgot everything.