Modem on ZX

Hello Stanislav! 20 Jul 00 23:43, Stanislav Udin -> All: SU> modem in the sense (Rockwell 14400) for as much as 450 rubles Here USR 14400 costs 400 rubles, but people don’t charge Rockwell for 200... SU> connecting a modem - Kondratiev’s scheme using interrupts. This is the best option. === Home Windows Clipboard === ─ Spectrum (2:5020/2065) ──────────────────── ──────────────────── ZX.SPECTRUM ─ Np/p: 4 out of 301 From: Kirill Frolov 2:5030/827.2 24 Dec 99 01:21:54 K: All 25 Dec 99 06:33:30 Subject: F.A.Q. ------------> MODEM ON SPECTRUM ─────────────────── ──────────────────── ──────────────────── ──────────────────── Peeples! Press RESET immediately! Subject! I definitely remember someone asking about glitches again! ==================================================================================== * Forwarded from NETMAIL by Kirill Frolov (2:5030/827.2). * Originally by: Felix Knajzev (2:5030/827.9), 23 Dec 99 19:56. * Originally to: Kirill Frolov. ==================================================================================== Greetings, O venerable Kirill! [Wednesday December 22, 1999] at [00:59:06] Kirill Frolov wrote a letter to Felix Knajzev. They discussed the topic "Modem". Let's continue what we started... [skip] MD>>> By the way! Judging by experience, to connect the modem to Specky, MD>>> better MD>>> use the Kondratiev scheme, BUT! on _ONE_ mikruha MD>>> LL1, because MD>>> like the others are simply not needed (to work with Melon)! A MD>>> if not K>> K>> ~~~~~~~~~~~~~~~~~~~ K>> Only for ^^^ K>> K>> At S-Terminal or Dickie you will break off. KF> I did not respect IS-Dos almost from the first days of her life. KF> I have not seen these programs, but Melon suited me quite well KF> with the exception of some very annoying ones KF> defects. K>> But that's not all. Some modems need a capacitor K>> (better K>> one-shot) on IRQ connect, data and address K>> buffer. Otherwise file K>> will not download in Melon at all, just CRC eppop. KF> I had no problems with this - I plugged in the modem, and it didKF> immediately worked as it should. But the moped for 14400 is just a diagram KF> Kondratiev and recognized... K>> Resetting is also a different story... KF> Which one??? In general, knowledgeable people! Would you like a FULL FAQ for KF> connecting modems to Specky, and all the problems associated with KF> this! After all, how many people would say THANK YOU! [skip] KF> Do you have a fact? Didn't you save the one I recently posted in REAL.SPECCY? did you post? Here, throw this to the lamers :), let them have no more questions. Believe me, everything that is written just below is the solution to ALL problems when connecting Hayes according to the MK scheme... ================== begin of file "ZX&Hayes.W" ================== ╔══════════════════════════════ ════════════════════════════════ ║Saved for History by Felix Knajzev (2:5030/827.9) ╠══════════════════════════════ ════════════════════════════════ ║Aria: REAL.SPECCY ║From: Felix Knajzev (2:5030/827.9) ║To: All () ║Topic: "ZX+Hayes: something similar on the FAQ... :)" ║Date: Friday 26 November 1999 ║Time: 16:54:48 ╚══════════════════════════════ ════════════════════════════════ Greetings, O venerable All! ================== begin of file "ZX+Hayes.W" ==================╔══════════════════════════════ ════════════════════════════════ ║Saved for History by Felix Knajzev (2:5030/827.9) ╠══════════════════════════════ ════════════════════════════════ ║Aria: .NETMAIL ║From: Felix Knajzev (2:5030/827.9) ║To: Kirill Frolov (2:5030/827.2) ║Topic: "Hayes on the Spectrum without glitches" ║Date: Sunday 7 November 1999 ║Time: 16:06:37 ╚══════════════════════════════ ════════════════════════════════ Greetings, O venerable Kirill! [Friday 5 November 1999] at [04:23:06] Kirill Frolov drew letter to Felix Knajzev. They discussed the topic "Hayes on the Spectrum without glitches." Let's continue started... =============================================================================== KF> For more than three months now I have been using hayes-compatible KF> modem KF> Sportster 14400. Of course, this modem has good KF> capabilities. And most importantly KF> is access to FIDO. But unfortunately it was not without KF> problems. Not rarely KF> strange phenomena are observed: a sudden breakdown of communication (puts KF> handset) directly into KF> exchange time, hangs up when dialing, hangs (not yet KF> cut off all powerKF> nothing can be done on the computer), inoperability What year is your Sprat? If it's 1995, then you're welcome guaranteed. :) See for yourself: ================== begin of file "14400_0 .i" ================== ┌───────────────────────────── ────────────────────────────── From: Nick Mesheryakov To: Pasha Ezoff MSG #99 01-Jul-98 09:27 Topic: Modem hangs └───────────────────────────── ────────────────────────────── Beer drinkers greet you, O Pasha! This vile libel is nothing more than a response to a letter from . PE> Here problems with usr14400 int were discovered. Everything works great PE> in PE> is a soapbox, but at some point during initialization it is cruel PE> hangs and PE> only a power reboot helps. How to wean a modem off PE> this matter? PE> Initiated by at&f1. There were rumors that robotics were either 95 or newer, which had just such a bug. The solution was to buy a normal modem :( Actually, that's all... Nick Mesheryakov (c_trunk@party.spb.su) -+- + Origin: Fifteen people on a dead man's chest! (2:5030/462.11) .================== end of file "14400_0 .i" ================== And one more thing... ================== begin of file "14400_1 .i" ================== ┌───────────────────────────── ────────────────────────────── From: Alex Romanov To: Pasha Ezoff MSG #56 01-Jul-98 18:39 Topic: Modem hangs └───────────────────────────── ────────────────────────────── Hello Pasha! Tuesday 30 June 1998 18:06, Pasha Ezoff wrote to All: PE> Here problems with usr14400 int were discovered. If you don't touch DTR, it won't hang. You need to write Dial_Terminate ~| , and not as by default v'^'| Alex. -+- GoldED/2 2.50+ launched under OS/2 in St. Petersburg. + Origin: MAXIMUM/2 BBS 23-07 583-5390 28.8Kbps (2:5030/557.17) . ================== end of file "14400_1 .i" ================== And finally... :) ================== begin of file "14400_2 .i" ================== ┌───────────────────────────── ────────────────────────────── From: Alexey Romanov To: Pasha Ezoff MSG #70 02-Jul-98 07:46 Topic: Modem hangs └───────────────────────────── ────────────────────────────── Hello, dear Pasha! I’m sitting, not touching anyone, and suddenly I see Pasha Ezoff writing to All... PE> Here problems with usr14400 int were discovered. Everything works great PE> in PE> is a soapbox, but at some point during initialization it is cruel PE> hangs and PE> only a power reboot helps. How to wean a modem off PE> this PE> are you doing? Init by at&f1. In the terminal: AT&F1 ATX3&W And initialization according to ATZ. PS. It is not necessary to write (&W) and ATZ, but it is more convenient. It helped me, as far as I remember. ICQ: 6868924 metalnet@metalnet.hypermart.net -= Alexey Romanov =- -+- + Origin: A8 94 73 5D 66 DE 3D 3C 4A AC 68 0E E1 F4 F2 AE (2:5030/586.9) . ================== end of file "14400_2 .i" ================== At what speed do you use the som port in Melon? With more than 9600 this program does not allow *reliably* work. Power (+5V) to the modem must be supplied directly from that place the main board of the computer, where it (power) comes from the unit food :) Sorry for the taftology. :) There must be wires for this *minimum* length and cross-section of at least 1mm.sq.!!! Right on slot for the modem, unsolder the electrolytic capacitor (for +5V, preferably tantalum, type K52-1V. or K53 series) capacity 47...220 µF. KF> TURBO mode... KF> The modem is connected according to the Kondratieff circuit. Software used - KF> Melon 1.80KF> Until some time I attributed all these glitches to KF> program, explaining all these KF> phenomena of imperfection and crookedness Melon 1.80, but You yourself are crooked. :) Normal software. True, only a version 1.80+ (aka the last one) is free from most glitches. !!! Melon needs to be launched from boot, which is before starting BASIC programs do: ==================== LD IY,23610 RES 4,(IY+1) ==================== If this does not happen, then Melon's glitching is for you guaranteed, especially during dialing (the program is simply hangs). KF> as a result of long-term KF> observations (daily connections), I came to a different conclusion. KF> Excessive criticality is to blame for almost all glitches KF> of the modem itself KF> control signals. This means that for complete elimination KF> glitches will be required KF> maintain all timing parameters of signals with high KF> accuracy. That's it KF> fulfillment of this condition delivers to the Spectrum user KF> great difficulties KF> (you have to select containers long and hard). And where have you already put them?KF> The solution to the problem is simple: you need to find the ISA bus standard and KF> according to it KF> assemble circuits for generating control signals. There is no need to look for anything. I thought so too some time ago. I was wrong. All your problems are most likely not caused by correct connection of the modem to the computer or problems *self* modem So try the following: 1. The modem *must* be connected to the computer bus conductors of the *minimum* possible length!!! 10cm is maximum!!! Ideal - if the data bus is fed to the modem "ribbon" (like a cable for a disk drive), in which the signal the conductors go through one with the conductors of the common wire. The number of conductors, of course, doubles :(, but at the same time the noise immunity increases significantly. 2. Install between addresses A8, A9, A10 and the modem (for each address) for two series-connected valves 555(1533)TL2 (Schmitt trigger). TL2 itself (you will need one case) place in immediate proximity to the modem! Ideally, solder directly on the slot. (This item is recommended to be implemented last if Nothing else helps. :) 3. “Decouple” the data bus of the modem and computer using a buffer. ================== begin of file "buf4mod .C" ================== (imported 74LS245 work better than our 555AP6)So, how to connect the buffer: +5Bo K555AP6 ┌───────┴┐ __ ┌─────────┐Scorpion (74LS245) │8Rx 4.7K│ modem B18/RD LL1 │13┌──┐11 │┌──┬───┐ ┌──┬──┬──┐ └┬┬┬┬┬┬┬┬┘ ┌───┬──┐ >─────────────o──┤1 ├─ ││D0│b6 ├─>─2┤A0│BF│B0├18─o┼┼┼┼┼┼┼──>│a9 >│D0│ ____ 12│ │ ││D1│b7 ├─>─3┤A1│ │B1├17──o┼┼┼┼┼┼──>│a8 │D1│ B17/IORQ 1┌──┐3 ┌─┤ │ ││D2│b8 ├─>─4┤A2│ │B2├16───o┼┼┼┼┼──>│a7 │D2│ >────────┤1 │ │ └──┘ ││D3│b11├─>─5┤A3│ │B3├15────o┼┼┼┼──>│a6 >│D3│ A24/A4 2│ ├──o───────┐││D4│b12├─>─6┤A4│ │B4├14─────o┼┼┼──>│a5 │D4│ >────────┤ │ │4┌──┐6 │││D5│b10├─>─7┤A5│ │B5├13──────o┼┼──>│a4 >│D5│ __ └──┘ └─┤1 ├─ │││D6│b9 ├─>─8┤A6│ │B6├12───────o┼──>│a3 │D6│ B19/WR ЛЛ1 5│ │ │││D7│b3 ├─>─9┤A7│ │B7├11────────o──>│a2 │D7│ >────────────────┤ │ ││└──┴───┘ ├──┤ ├──┤ >└───┴──┘ LL1 └──┘ │└───────────1┤T │ │+U├20─o+5B │ ├──┤ ├──┤ └───────────19oOE│ │0V├10─┐ └──┴──┴──┘ ▀▀▀ . ================== end of file "buf4mod .C" ==================Power to the ls245 must be supplied with *short* wires with a cross-section cores no less than 0.5mm.sq. // legs 10 and 20 (food) hang blocking ceramic capacitor from 0.1uF to.... :) !!! The MC buffer itself should be located as close to the board as possible computer (processor), i.e. so that the data bus conductors (and power supply) from the processor to the buffer were of _minimal_ length! After buffer before modem - up to 25 cm. Again, a “ribbon through one with the common." KF> COMRADES SPECTRUMISTS! If anyone has this information, KF> share with everyone! =============================================================================== KF> It's started again!!! ;-) Please, transfer this to ZX.SPECTRUM!!! And call THIS a FAQ. :) Best regards, Felix. [I.ZX] -+- Lara_Croft_v4.40 + Origin: Was, but floated... (2:5030/827.9) ================== end of file "ZX+Hayes.W" ================== Best regards, Felix. [I.ZX] -+- Lara_Croft_v4.40 + Origin: UnREAL on REAL! (2:5030/827.9) ================== end of file "ZX&Hayes.W" ================== Best regards, Felix. [I.ZX] -+- Lara_Croft_v4.40 + Origin: Was, but floated... (2:5030/827.9)==================================================================================== Immediately press RESET, All! Kirill Frolov. [ZX] + Origin: I am the Absolute Monarch and the stars obey me... (2:5030/827.2) ===End of Windows Clipboard === Best regards, Evgeniy.

Greetings, O venerable Stanislav! [Thursday 20 July 2000] at [23:43:32] Stanislav Udin wrote a letter to All. They discussed the topic "Modem on ZX". Let's continue what we started... SU> One of our spectrists is finally ready to connect SU> modem for your KAY-1024 and even already bought it, the modem in SU> sense (Rockwell 14400) for as much as 450 rubles. But that's not the point. I In St. Petersburg USR14400 - for 300 rubles. SU> I can’t remember where I saw the connection diagram(s), but SU> it (them) was published not once, not twice, not even three times. But I don't SU> is able to rummage through all the electronic data I have SU> the press, and therefore I appeal to the masses to help them remember where ============== here we will start the file "zx+hayes.C" ================ Modem coordination board with Scorpion __ B18/RD LL1 13┌──┐11 .────────────────┤1 IOR/B14 ____ 12│ │ ┌────────────────────────>IOW/B13 B17/IORQ 1┌──┐3 ┌─┤ │ │ ┌───────────────>IRQ4/B24 .────────┤1 ├──o └──┘ │ │ LH1 A24/A4 2│ │ │ ЛЛ1 │ │1┌─┐2 ___ .────────┤ │ │4┌──┐6 │ └─┤1o─┐ B23/NMI.─────┐ __ └──┘ └─┤1 ├──o TM2 └─┘ │ LL1 │B19/WR LL1 5│ │ │ 1┌─┬──┐ │ 9┌──┐ │ .─────────────────│ │ ─oR│TT│ │──┤1 │8 ┤ A28/A11 └──┘ │ 2├─┤ │5 10│ ├────────┘ .──────────────────────D│ Q├───────┤ ┤ │ 3│ │ │ └──┘ _____ └────/C│ _│6 mycposchemes: 155LL1 A20/RESET 4├─┤ Qo-x 155ЛH1 .───────────────────────────│ 155TM2 │3┌─┐4 └─┴──┘ └─┤1o────────────────────────────────────────────>B └─┘ .─ nomep pin on system bus/ LH1 /signal name conclusions : 7 - land microcircuit: 14 - + 5 v ─> signal name / modem pickup capacitor connectors: to 7 and 14 legs LL1 m TM2; on +12v modem capacity: 0.01-0.1μf Additional SCOPPIOHA scheme D55 ┌────┐ Z80 ┌─────┐34 (DD32 Turbo+)│ DC │ │ CPU ├─>A4 pezpezat │ │ pezpezat │ │ m/s 155LI1 6│ │ 17│ │ blind solder, ───o──x───o┤ │ │ ───o──x───o┤ │ paw with system │1┌──┐3││ │ │4┌──┐6││ │ downstairs └─┤& ├─┘│ │ └─┤& ├─┘│ │ A4 2│ │ └────┘ 5│ │ └─────┘ ──────┤ │ ┌───┤ │ to Z80└──┘ DD 155LI1 │ └──┘ on system pickup└──────> NMI/B23 scorpio modem ┌──────┬───┐ ┌───┬──────┐ HINT │ A8 │b26├────>│a31│ A0 │ by modem selection │ A9 │a27├────>│a30│ A1 │ │ A10 │b27├────>│a29│ A2 │ MANDATORY!!! │ D0 │b6 ├────>│a9 │ D0 │ on the modem connector │ D1 │b7 ├────>│a8 │ D1 │ must be activated │ D2 │b8 ├────>│a7 │ D2 │ only indicated │ D3 │b11├────>│a6 │ D3 │ new contact numbers. │ D4 │b12├────>│a5 │ D4 │ │ D5 │b10├────>│a4 │ D5 │ If and are used │ D6 │b9 ├────>│a3 │ D6 │ dp. contacts, modem │ D7 │b3 ├────>│a2 │ D7 │ may NOT work. │ │ │ │a28│ A3 │ ─┐ │ │ │ │a27│ A4 │ │ HA │ │ │ │a26│ A5 │ │+5v │ │ │ │a25│ A6 │ │via │ │ │ │a24│ A7 │ │3-10k │ │ │ │a23│ A8 │ │ │ │ │ │a22│ A9 │ │ │ │ │ │a21│ A10 │ ─┘ │ │ │ │a11│ AEN │ to ground │ +5v │a3 ├────>│b3 │ +5v │ --->│ -5v │ ├────>│b5 │ -5v │ --->│ +12v │a17├────>│b9 │ +12v │ --->│ -12v │a14├────>│b7 │ -12v │ │ GND │a30├────>│b1 │ GND │ │ GND │b30├────>│b31│ GND ││ │ │ ┌─┐ │ │ │ │/RESET│a20├─┤ │ │ │ │ │/RD │b18├─┤п│ │ │ │ │ A4 │a24├─┤l│ │ │ │ │/IORQ │b17├─┤а├─┤b2 │ RESET│ │/WR │b19├─┤т├─┤b14│/IOR │ │ A11 │a28├─┤а├─┤b13│/IOW │ --->│/NMI │b23├─┤ ├─┤b24│ IRQ4 │ └──────┴───┘ └─┘ └───┴──────┘ signal signal ---> connect the signal to the system bus The cable connecting the Scorpion system connector to the adapter board insertion with the modem connector (slot) sealed on it should be no longer than 25 cm. (c) 1995 Michael Kondratyev . ============== here we will end the file "zx+hayes.C" ================ SU> published the specified diagram(s), and confirm for one thing SU> the correctness of my choice of modem connection option - SU> Kondratiev scheme using interrupts. The right choice. Best regards, Felix. [I.ZX]