ESSENTIAL QUESTION

So, the question has arisen: what to collect?

I want to make myself a cool car, so I settled on choosing a platform:

Pentagon, ATM-Turbo, Profi, Scorpion, or something else?

i.e. It’s worth choosing a base on which the rest of the “stuffing” will be hung :)
these are: AY, SounDrive (maybe DMA Sound), 2xFDD, Mouse, 1(2)MB SIMM, etc.

what to take as a basis, and what should be taken into account? what “pitfalls” can you encounter?

why am I asking - I only dealt closely with Leningrad clones,
and worked a little with the Pentagon (with a friend:)

I will be grateful for your help in this matter.

p.s. by the way, don’t send it to the Internet :) I don’t have it :)

Sincerely, Vadim.

... Ay_Emul: Silent now...

25 Jan 03 08:31, Dmitry Edison wrote to Vadim Chumachenko:

DE> I would recommend Pentagon or Profi (4.05).
DE> 128 (if you can get it ready) there’s nothing left there
DE>, except AU obviously. so screwing it all together will bring a lot of
DE> pleasant minutes :)

ATM-Turbo is better - there are more glitches and the circuit is the most different (from others).

VC> I want to make myself a cool machine, so I settled on choosing a
VC> platform:
VC> Pentagon, ATM-Turbo, Profi, Scorpion, or something else?

I would recommend Pentagon or Profi (4.05).

VC> i.e. it’s worth choosing a base on which the rest of the “stuffing” is already hung
VC> these are: AY, SounDrive (maybe DMA Sound), 2xFDD, Mouse, 1(2) MB SIMM, etc.

But since you want to have fun yourself, the choice is obvious - Pentagon 128
(if you can get it ready) well, there’s nothing left there except
AU obviously. so screwing it all up will bring a lot of pleasant minutes :)

2 EnergyMinds: im back 2 fido! (:
__ __ __ __ __ __ __ __

DE>> a lot of pleasant minutes :)
KF> ATM-Turbo is better - there are more glitches and the circuit is the most different (from
KF> others).

Exactly! And Tr-Dos can be downloaded from a tape recorder if there is no money for a download 8-D

DE>> I would recommend Pentagon or Profi (4.05).
DE>> 128 (if you can get it ready) there’s nothing left there
DE>> there’s nothing left, except for AU obviously. so screwing all this together will bring a lot of
DE>> pleasant minutes :)

DE>>> I would recommend Pentagon or Profi (4.05).
DE>>> 128 (if you can get it ready) there’s nothing left there
DE>>>, except for AU obviously. so screwing it all up will bring a lot of
DE>>> pleasant minutes :)

Pentagon and Scorpion. The first is the Pentagon, the second is Leningrad. Next, what do you like best? And you shouldn’t mess with anything exotic.

<21:32> Vadim Chumachenko wrоte to All:

VC> I want to make myself a cool car, so I settled on choosing a
VC> platform:
VC> Pentagon, ATM-Turbo, Profi, Scorpion, or something else?

(voice from the sky): A Sprinter?

The Protoss have escaped. The zerg dug in. It's time for me to call it a day. Ivan.

- Divorce the scheme, big and small... [Sprinter] Sprinter-II [Forth-CPU]

... ivan...@mail.ru * http://winglion.spb.ru * http://www.petersplus.ru

25 Jan 03 23:42, Andrey Slusar wrote to Vadim Chumachenko:

AS> Take the Pentagon. Of the old ones, the most compatible with software written by
AS> “ours” for the Spectrum.

And the 128/512 button? You need to press it often.

VC>> I want to make myself a cool car, so I decided on the choice of
VC>> platform:
VC>> Pentagon, ATM-Turbo, Profi, Scorpion, or something else?

KF> And the 128/512 button? You need to press it often.

What are the problems? I personally assembled the multiport immediately after upgrading to 512kil.
--
All the best!
Andrey.

AS>> written “ours” under Spectrum.
KF> And the 128/512 button? You need to press it often.
Not a button, but a toggle switch. ;)
And you don’t have to switch it often. Mainly not because the program doesn't
work, but because they're playing it safe, and in general I don't remember a single program
that wouldn't work at 512.

KF>
KF> And the 128/512 button? You need to press it often.
I always have 1MB (7+6+5bits), there is a button, but I don’t use it because the gadget
special soldered :]

pokedova Kirill
jtn\\4d

SP> And you don’t have to switch it often. Mainly not because the
SP> program does not work, but because they are playing it safe, and in general I don’t remember a single
SP> program that would not work at 512.
UFO-2

pokedova Sasha
jtn\\4d

VK> I always have 1MB (7+6+5bits), there is a button, but I don’t use it because
VK> I soldered a special gadget :]

What kind of switch is this?

SP>> the program does not work because they are playing it safe, but in general I don’t remember a single program that would not work at 512.
VK> UFO-2

It works fine for me at 128 kb. Although it costs 1024kb, she doesn’t see them.
:(

SP has a demo of Mortall Kombat with large sprites and a minimum of 256kb (only
Pro). Very cool.

Sincerely, Alexey.

AT>
AT> Works great for me on 128 kb. Although it costs 1024kb, it does not
AT> see them. :(
there was talk about the Pentagon expansion over 128k...

AT> For SP there is a demo of Mortall Kombat with large sprites and at least 256kb
what is SP?
AT> (Only Pro). Very cool.
Only 256k and only Pro? I doubt it...

Pokeova Aleksey
jtn\\4d

KF>
KF> What kind of switch is this?

I threw it here once, and it was published in adventurer, here is a part of that
article:

Probably many, having made
themselves a Pentagon512 memory expansion,
often, scolding the coders, click
the ON/OFF switch. And all because
it is now fashionable to refer to #7ffd by
#fd, but with mask #40 (all thanks to
Scorps with Kais and their system port
#1ffd). Example: LD a,#50:OUT (#FD),A -
turn on bank 0. Well, accordingly, for some
256/512kb, the wrong
banks start to turn on, the ramdisk gets spoiled and other nonsense.
And some even specifically (this is completely in vain) switches the memory using #fd
(Ultrasonic - digital tracker). In short
in short, this problem has been solved for a long time (I
haven’t used the pent512
on/off switch for a year and a half).

Usually the expansion scheme looks like this:

pent512 on/off
/ --T-T-┐
--------/ L---T-------------oR│T│ │
│ │ │-+ │ │ - pair of triggers
+ +5V o--===-- ------------/C│ │ │
10K │ D6 +-+ │ │
WR7ffd │ D7 ------+0│ │0+--
------------------- ---------+1│ │1+--
│ │ │ │
L-+-+--

A trigger microcircuit is usually a pair
of elements TM2 or TM9 or TM8. UTM2
inputs R (must be connected) - 1 and
13, for TM8 and TM9 - 1. Inputs C for TM2
(must be connected) - 3 and 11, for TM8
and TM9 - 9.

Modification scheme:

D7: 1533ЛЭ1

pent512 on/off
/ --T-T-┐
--------/ L---T---T--------oR│T│ │
│ │ │ +-+ │ │
+ +5V o--===-- -----------/C│ │ │
10K │ │ D6 +-+ │ │
WR7ffd │ │ ------+0│ │0+--
--------T---------- │ D7 --+1│ │1+--
│ D7.3 │ ----- │ │ │ │
│ ---┐ │ L-+-+--
+-8+1 │ L-----------------┐
│ │ o10-┐ D7.2 D7.1 │
L-9+ │ │ ---┐ ---┐ │
L--- L-6+1 │ -3+1 │ │
A13 │ o4-+ │ o1-+<+-
-----5+ │ L2+ │ \
L--- L--- \diode

Instead of D7, you can use
an inverter and element LL1 (if there are
free ones on the board). Particular attention
should be paid to signal WR7ffd. Here
is an option suitable for Pentagon
and Pros: when there is no entry to the port
WR7ffd=log.0, if yours is different, then
send WR7ffd without inversion (without
D7.3). The operating principle is as follows:
1. LD BC,#7FFD:LD A,#50:OUT (C),A
full addressing - A13=bit5,B=1 - at
output D7.1 we have logic 1, triggeris not
reset, bank #50 is turned on.
2. LD A,#50:OUT (#FD),A
addressing is short - A13=bit5,A=0
(let me remind you, the 5th bit of A is a lock
#7ffd, so it is always equal to 0)
When WR7ffd=1 is written, then
at the output D7.1 - log.0, which
resets the trigger - 6th and 7th bits. In this way, bank 0 is turned on.

Disadvantages: still does not work
UFO 2, because there, before recording in
#7ffd, a #c0 mask is applied.

12 Feb 03 20:38, Vassili Klimov wrote to Kirill Frolov:

VK> Disadvantages: it still doesn’t work
VK> UFO 2, because there, before writing to
VK> #7ffd, a #c0 mask is applied.

Well, as always... :-(

AT>> does not see them. :(
VK> there was talk about the Pentagon expansion over 128k...

I am aware, but I don’t understand why they only supported it.

SP>>> And you don’t have to switch it often. Mainly not because
SP>>> the program does not work, but because they are playing it safe, and in general I
SP>>> I don’t remember a single program that would not work at 512.
VK>> UFO-2
AT>> It works fine for me even on 128 kb. Although it costs 1024kb, it
AT>> does not see them. :(
VK> there was talk about the Pentagon expansion over 128k...

please send it to me!

Sincerely, Vadim.