Modern ZX-Spectrum hardware — ZXNet «real.speccy»

From Yuri Voynalovich To All 12 September 2000

Hi *Eugene*!

And it all started on 30-Aug-00 at 22:13:17, when Eugene Palenock
talked to All about Modern hardware ZX-Spectrum

EP> - cache-16 works instead of both BASICs? - and if you make
EP> call #1d13 from the cache - will TRDOS work? - and if you then return via RET to
EP> #0000-#3FFF - what will happen? ROM is TRDOS, and the cache will return when the program exits
EP> above #3FFF ?

The standard cache is turned on simply at the lower 16K, when the program is
executed in the cache at addresses #3dxx, trdos will turn on (to turn off
you will need to execute a command from Ozu)

EP> PS. I don’t have a cache or turbo yet...
But in vain

Always yours Combin8or/PHT

From Vassili Klimov To All 15 September 2000

what the hell is TRDOS, if the cache is turned on, then all the keys are cut off
i.e. by call #3dxx the vgshki ports simply become available
no trdos is turned on!
To disable the vgshk ports (for example on the Pentagon, when
these ports are enabled, you cannot read #FE) you need to execute
any command in RAM

From Yuri Voynalovich To All 15 September 2000

VK> what the hell is TRDOS, if the cache is turned on, then all the keys are cut off
VK> i.e. by call #3dxx the ports of the vg-shki
VK> simply become available, no trdos is turned on!

This is how the TRDOS _signal_ is turned on (and in different circuits it is designated differently), it is clear that the ROM will not be replaced. Those. ports simply become available. You misunderstood.
In my understanding, TRDOS is turned on, this means the TRDOS signal is active (BETA, DOSEN,
etc.)

VK> To disable the VGSH ports (for example
VK> on the Pentagon, when these ports are turned on, you can’t read #FE) you need
VK> execute any command in RAM
Here exactly.

Always yours Combin8or/PHT

From Kirill Frolov To All 16 September 2000

Immediately click on RESET, Vassili!

15 Sep 00 10:38, Vassili Klimov wrote to All:

VK> To disable the vgshka ports (for example, on the Pentagon, when
VK> these ports are enabled, you cannot read #FE) you need to execute
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

How is 0xFE disabled??? But how does TR-DOS 5.12F work?

VK> a cache without a pipe is practically not needed
VK> except for hacking...

What hack? And for peaceful purposes, there is a lot of use - that’s an additional
as much as 16 kilobytes of memory instead of a completely unnecessary ROM! CP/M can be
started...

From Klimov Vassili To All 18 September 2000

> VK> To disable the VGSH ports (for example, on the Pentagon, when
> VK> these ports are enabled, you cannot read #FE) you need to execute
>

From Klimov Vassili To All 18 September 2000

> This is how the TRDOS _signal_ is turned on (and in different circuits it is designated differently
>), it is clear that the ROM will not be replaced. Those. ports just
> become available. You misunderstood.
> In my understanding, TRDOS is turned on, this means the TRDOS signal is active (BETA, DOSEN,
>, etc.)

From Yuri Voynalovich To All 18 September 2000

KV> why do you need to read the keyboard?

You need to write to 7ffd. By the way, on my Lenin, I first made sure that when trdos is active, _all_ ports on both rd and wr are cut off, but
then I had to do a conditional cutoff so that trdos5.12f,
memory commander, etc. would work.

Always yours Combin8or/PHT

From Kirill Frolov To All 19 September 2000

>> How is 0xFE disabled??? But how does TR-DOS 5.12F work?
KV> why is there keyboard reading?