1.44 0n 3.5 drive — ZXNet «real.speccy»

From Oleg Sazonov To All 13 December 1998

* sent to REAL.SPECTRUM
* sent to HARDWARE.ZX

Greetings, All!

Tell me, pls, a scheme for finalizing the spec so that
it can be used on a 3.5 drive
1.44 kb disks.

All the best to you, All.
E-mail: Oleg_Sazo...@zxnet.spb.ru
Write letters...

From Valerij Kozhevnikoff To All 19 December 1998

Hello, Oleg!

13 Dec 98 at 19:03:00, Oleg Sazonov => All:

OS> Tell me, pls, a scheme for finalizing the spec so that
OS> can be used on 3.5 drive
OS> 1.44 kb disks.

It is for the Pentagon. Nothing is clear at all. “Nog number such and such microcircuit
number such and such”, etc.
Although I guess that in the scorpion version it will be much simpler. Scorpio
has a lot already.

WBR, Jason.

From Roman Milukov To All 21 December 1998

There is a diagram for the Pentagon (by AXLR). The connection to its microcircuits is described -
numbers, legs...
And the general meaning is this:
When bit 7 of the #FF TR-DOS port is set to "1", double frequencies are turned on on a)
the VG93 clock input, b) IR16 (which is for recording) and c) on the PLL.
Turbo mode in the computer must be constantly turned on! Turn off only while the disk is spinning up (turns on later based on the index pulse). And a
brake must be made - lengthening /IORQ to normal duration, otherwise the VGshka will not
have time to transfer data.

There is no software for this yet, but it will be a promising idea.

All the best.
Roman.

From Pavel Fedin To All 21 December 1998

The hole responsible for the HD-ness of the floppy disk is sealed. That's all.

Bye, with a pack of vicious, Pavel Fedin.

... UI125:/0EPJFAGAECCVNGLFHGiGDGFFFPAFfBCKBRRDQCBKHIEBCCKC

From Kirill Frolov To All 21 December 1998

Hi, Valerij

It was 19 Dec 98 and 02:32:12, Valerij Kozhevnikoff wrote to Oleg Sazonov
on the topic 1.44 0n 3.5 drive
Not seeing a moderator nearby, I decided to insert a word:

VK> It’s for the Pentagon. Nothing is clear at all. “Lead number such and such
VK> microcircuit number such and such”, etc.
VK> Although I guess that in the scorpion version it will be much simpler. There is already a lot in the scorp
VK>.

I thought about it and decided - in the scorp we need to set the quartz to 16 for this :-(
And also be happy if the RTshka with TM9 pulls into the PLL :-( There is no other way.

With best wishes, Kirill Frolov.