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MTK2 for USSR teletypes

Verfasst: Di 6. Apr 2021, 13:59
von lis86
I-Telex, TW39 Serial unit, TW39 Interface supports MTK2 Cyrillic baudot code?

Re: MTK2 for USSR teletypes

Verfasst: Di 6. Apr 2021, 14:17
von DF3OE
i-Telex supports any 5 bit code with 50 baud. MTK2 is just another code chart but it does not translate the code to Latin.

Re: MTK2 for USSR teletypes

Verfasst: Di 6. Apr 2021, 14:30
von lis86
TW39 "Special" Serial Unit (teletype emulation on RS232) support MTK2?

Re: MTK2 for USSR teletypes

Verfasst: Di 6. Apr 2021, 14:41
von FredSonnenrein
There is a new version of the serial interface which supports switchable "codepages". Currently there is one version using the KOI8 character set on the 8 Bit 9k6 Baud interface and the "3 level" 5 bit baudot code (code 32 shifts to cyrillic).
Upon interest i can quickly provide any translation tables for the serial interface.

Re: MTK2 for USSR teletypes

Verfasst: Fr 16. Apr 2021, 14:18
von lis86
It is possible to order a new version with the English language of system messages?

Re: MTK2 for USSR teletypes

Verfasst: Fr 16. Apr 2021, 15:15
von FredSonnenrein
lis86 hat geschrieben: Fr 16. Apr 2021, 14:18 It is possible to order a new version with the English language of system messages?
Yes, no problem.
Which version would you prefer? For the ATmega328 processor including answerback function or for the "old" ATmega168 processor?
If you don't have the hardware yet, you should prefer the 328 version.

Re: MTK2 for USSR teletypes

Verfasst: So 18. Apr 2021, 14:21
von lis86
I don't have the hardware yet.
My board list to buying:
1. tw39 spezial (atmega328 version and english localization)
2. i-telex
3. Backplane for 4 board
How do I place an order with delivery?

Re: MTK2 for USSR teletypes

Verfasst: Mo 19. Apr 2021, 07:45
von FredSonnenrein
lis86 hat geschrieben: So 18. Apr 2021, 14:21 I don't have the hardware yet.
My board list to buying:
1. tw39 spezial (atmega328 version and english localization)
2. i-telex
3. Backplane for 4 board
How do I place an order with delivery?
Please contact Henning (DF3OE) for the "commercial questions", i will care for the correct software to be installed.
Are you sure to omit the power supply board?
Fred

Re: MTK2 for USSR teletypes

Verfasst: Fr 23. Apr 2021, 20:41
von lis86
FredSonnenrein hat geschrieben: Mo 19. Apr 2021, 07:45
lis86 hat geschrieben: So 18. Apr 2021, 14:21 I don't have the hardware yet.
My board list to buying:
1. tw39 spezial (atmega328 version and english localization)
2. i-telex
3. Backplane for 4 board
How do I place an order with delivery?
Please contact Henning (DF3OE) for the "commercial questions", i will care for the correct software to be installed.
Are you sure to omit the power supply board?
Fred
Waiting reply... power supply board is custom psu with independent power rail(~12v for relays, ~12v for analog modem (planned), ~8v for logic ic, ~60v for telex line).

Re: MTK2 for USSR teletypes

Verfasst: Sa 24. Apr 2021, 11:25
von FredSonnenrein
Generally okay but some remarks:
All voltages are positive
The logic needs 5V instead of 8 V
The 60V are named as such because of "history", i recommend 80 V
Two small but very important parts of the power supply board are the pull up resistors for the SDA and SCL bus lines.