On-Line #10 12 ноября 1995

Железо

Iron - Turbo HS computer firm Grandrommax.

                 IRON


        TURBO SH COMPUTERS IN FIRM GRANDROMMAX



   - Your floppy from GRM + "flies" on other computers in the
the first attempts to write to them?


   - Your GRM + works great with any "outsiders" floppies, but
after writing on them "strangers" kopyutera they can not see?


   - Do not read floppy disk from the GRM + on IBM (GRM + sees 
them, and IBM - no)?



   The answer to these questions lies in the incorrect circuit 
turbirovanie VG93 computers GRM +. 


   The following scheme eliminates all these shortcomings with 
a minimum number of changes on the board (to be added Only one 
chip). Now the problems with the floppy is not at all! 


   Since the company is constantly improving GrandRomMax scheme
their computers, I do not give a specific number on the chip
board and their findings (they are different versions may be 
different), but "Chain" of three elements-2, NO, switching 
clock VG93, present everywhere and in their schemes can be 
found without labor.

                ___

   Cut boldly signals WRG (WRG), soldered, "sandwich"
liked to place a trigger TM2 and collect, as shown below! This 
is class! Now none of your disk at a "normal" computer does not 
fly off when trying to write on it and be perfectly readable 
diskette MS-DOS after working with them on the GRM +. 

 ___
 WRG x '
                             O
              2 MHz 'CLK (24 VG93)
                                        O
 WRG x '
                            O
             1 mHz



       ____

       STEP 10

               O S 9
                   Q
         12
             D


1938 VG93 1911 TM2
(DRQ) C
                     8
1933 VG93 1913 _
(WF / DE) O R Q O



   Trigger - any series (155, 555, etc.), but it is preferable
1533TM2 (eating less).
      ____

   STEP signal is taken from diskovodnogo size sockets on your 
computer. 


   The basis of the scheme - Article CHUNG Softvare, ZX-Review 
4 / 95 p.35. But carefully read the text - in a published 
scheme there is a typo! Also, with the aim of "bloodless" 
instead of the multiplexer is used "native" chip GRM + (LA3). 


   Many thanks to you, Cyril, for your research! Thank you so 
much for sharing them with everyone! Often appeared on pages 
ONLINE - it's rapidly than ZX-Review! 


   GrandRomMax! Rather, make the seventh version of the board! 
Better yet, before that, check with CHUNGom, at the same time, 
and about Port # FF.

                       BBS 164-1684; 22.45-07.00
                       Aleksey@alex.msk.ru
                       On: the schedule in the ON-LINE or
                       on the BBS in file Alex_BBS.W

PS: After the above-mentioned alterations required perekopiruyte
or will restore all your floppies!