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The topic of "turbocharging the VG" raised in the tenth issue has received a new continuation. We were pleasantly surprised when a letter from the author of that first message, which was sent to us by one of the magazine's readers, arrived at our editorial office.
So today we publish a new revised and corrected "turbocharging" scheme. The author's style has been preserved.
From: Vladimir Larkov
To: All
CORRECTED AND REVISED
VG-93 TURBOCHARGING SCHEME
For a long time, I had no connection with the world through ZX. Recently, there was a rumor that Alexander Mudretsov had the fortune to submit my old letter with the turbocharging scheme of the VG to the editorial office of the electronic magazine "SPECTROFON". And the editorial office of this magazine had the imprudence to publish that scheme. However, that scheme had a flaw, and a rather serious one. For a long time, I wanted to tell the world about that flaw and how to deal with it, but there was no opportunity...
Therefore, read (if you're interested) the following letter of mine, which didn't go beyond the local aria... One can only hope that the ZX aria on our BBS will come to life and this letter will eventually leave the station's limits.
Yes, the flaw was that when attempting to write (rename, erase, i.e., any operation related to writing) on a "non-turbo" VG, the disk that was written on a "turbo" VG would instantly die! Now all this (for me) is in the past. It is necessary to add one more TM2 to that old scheme, and the problem will disappear.
Yes, don't forget, if you have already made a scheme on one KP11, before writing to the disks used in this mode, you must "restore" them first, otherwise - trouble!
That is, "new" turbocharging, just like the non-turbo VG, kills "old" turbocharging WHEN WRITING.
Thus, I spent half a day restoring all my disks, but now I know no problems and can safely give formatted disks to "non-turbo" people.
So, read the letter, look at the scheme.
17-Jan-95 06:44 Vladimir Larkov
wrote a letter to Sergey Sewastjanov:
... In general, the VG is turbo, but the turbo mode is almost always turned off due to its tendency to instantly mess up the disk when switching to normal speed, and as always, the catalog suffers.
... Right. This is where it should have started. Such a tendency is inherent in the turbo VG on one KP11(16). You probably have this. It's not just simple, but very simple - look for TM2. After I installed this TM, the shadow became well-behaved, and all the disks are alive. See the scheme:
REVISED SCHEME 24(VG)
TURBOCHARGING VG-93 ────────┐
│
12(D56)-2MHz 11(D56)-1MHz│
────────────┐ ┌───────── │ │
│ │ KP 11 │
12(D69) TM2 │ │3┌──┬──┐4 │
STEP 4┌─┬───┐ │ └─┤1 │MX├──┘
─────оS│ TT│5 │ ┤2 │ │
GND 2├─┤ ├── │ ┤3 │ ├─
─────┤D│ │ │ ┤4 │ │
30(VG)3│ │ │ │ 2├──┤ ├─
─────┤C│ │6 └───┤1 │ │
33(VG)1├─┤ ├─┐ ┤2 │ ├─ ┤ │ │
───┬─oR│ │ │ ┤3 │ │
│ └─┴───┘ │ ┤4 │ │
10kOm▒ │ 1├──┤ │
▒ └──────┤A │ │
+5V│ GND 15│ │ │
│ ────────oCS│ │
└──┴──┘
Note: chip numbers for the "Scorpion" computer.
Sequence of actions for those who are doing turbo mode for the first time and immediately according to the above scheme:
1. Cut the conductor going to pin 24 of the VG. Connect pin 24 of the VG to pin 4 of the KP11.
2. Following the cut conductor, we come across a pin of some microchip (1 MHz). This is the one we connect to pin 3 of our KP11 (for Scorpion - pin 11 D56).
3. On the neighboring pin of the microchip just calculated is 2 MHz. We calculate which one exactly according to the scheme or measure with an oscilloscope (for Scorpion - pin 12 D56). Connect it to pin 2 of our KP11.
4. Connect pin 15 of our KP11 to ground, pins 8 and 16 - as usual, power.
5. Connect pin 1 of our KP11 to pin 6 of our TM2.
6. Connect pin 2 of our TM2 to ground, pins 7 and 14 - power.
7. Connect pin 1 of our TM2 to pin 33 of the VG and also connect it through a 10 kOhm resistor to +5V. Check your board; you may already have this resistor installed (it was not on the Scorpion).
"S": Thank you very much to the author for the ingenious improvement of the turbocharging scheme and to our correspondent Mikhail Markovsky for the prompt submission of information.
Contents of the publication: Spectrofon #12
- Expertise - Дмитрий Усманов
Detailed description of gameplay mechanics for a tactical video game involving combat on an alien spaceship. The article outlines various game strategies and character abilities. Includes information on game stages and outcomes.
- The Exam
Description of a successful heist strategy in the game 'THEY STOLE A MILLION' by readers from Tomsk. Includes step-by-step details on disabling alarms and managing resources. Raises a new challenge for readers to accomplish a heist without arrests.
- Premiere
Review of two programs for ZX Spectrum: a math learning tool for children, and a cellular automaton simulation.
- Review
Review of recent gaming software releases in Moscow, highlighting domestic and foreign games, with detailed critiques of several notable titles.
- From the World by Bit
Discussion of the demo version of the game 'Star Heritage' by Step Creative Group, based on reader feedback and suggestions. Details about gameplay tips, technical aspects, and future plans for the full version. Comments on other game projects and software queries.
- System - Vladimir Larkov
Detailed guide on improving VG-93 turbo mode with corrected schemes.
- Advertising
Advertising opportunities for ZX Spectrum users and detailed instructions for purchasing Spectrofon magazine across Russia.
