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!
