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Development => Hardware => Topic started by: Keoni29 on November 17, 2014, 10:39:48 pm

Title: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 17, 2014, 10:39:48 pm
The Visicom is a textphone for deaf people from the 80's. It has a keyboard, video output and built in modem. You could use it as a textphone using the textphone protocol or as a teletype (tty) using the built in modem.

I bought this at a thriftshop because it looked interesting.
I decided to crack it open and find out exactly what makes it tick. Detailed documentation can be found on my project page: http://8times8.eeems.me:81/project/software/visicom/

(https://codewalr.us/proxy.php?request=http%3A%2F%2F8times8.eeems.me%3A81%2Fproject%2Fsoftware%2Fvisicom%2Fmedia%2Fvisicom.png&hash=888f724e8d913f3c514d03b7b5ac1856)
The built in keyboard.
(https://codewalr.us/proxy.php?request=http%3A%2F%2F8times8.eeems.me%3A81%2Fproject%2Fsoftware%2Fvisicom%2Fmedia%2Fguts.jpg&hash=a56e4f39a321b33e914299c99f8b4926)
Guts
(https://codewalr.us/proxy.php?request=http%3A%2F%2F8times8.eeems.me%3A81%2Fproject%2Fsoftware%2Fvisicom%2Fmedia%2Fvideo.jpg&hash=eebf7d41cfb894587cd9e1616d933e3c)
Video output. You're greeted with a dutch menu. This image shows B&W video, but there is a switch inside the device which enables 8 color video.
(https://codewalr.us/proxy.php?request=http%3A%2F%2F8times8.eeems.me%3A81%2Fproject%2Fsoftware%2Fvisicom%2Fmedia%2Fromdump.jpg&hash=606699f2669c84e7f534cfaad8f564a2)
Rom reader device I built to dump the firmware. The disassembly can be found here: http://8times8.eeems.me:81/project/software/visicom/disassembly.php
I found an open-source disassembler written in Golang for the tms7001 microcontroller that is inside the visicom, but it was really buggy. I managed to fix a lot of the bugs even though I don't know Golang :P.

Using javascript I made all addresses operands links so you can jump by clicking them.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 17, 2014, 11:37:24 pm
Wow nice, I think we have our official hardware hacker already up and running ! :D
Title: Re: Visicom Textphone Reverse-engineering
Post by: pimathbrainiac on November 18, 2014, 12:58:24 am
That is awesome! Is the textphone protocol proprietary, or is it a standard protocol? If it is proprietary, will you reverse engineer it?
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on November 18, 2014, 03:16:50 am
So they had some form of SMS way back in the 80's? Nice :P

Seriously though it's fun to see old hardware like this and knowing you do a lot of modding, I am interested to see what you will do with this ;)
Title: Re: Visicom Textphone Reverse-engineering
Post by: aeTIos on November 18, 2014, 12:22:53 pm
Only €10 gives you a bunch of fun~ :D
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 18, 2014, 01:41:28 pm
Quote from: DJ Omnimaga on November 18, 2014, 03:16:50 am
So they had some form of SMS way back in the 80's? Nice :P

Apparently. Also SMS exists ever since mobile phones do. :P
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 18, 2014, 06:26:59 pm
The textphone protocol is pretty straightforward. It uses dial tone sequences to transmit characters. In theory you could dial characters in by hand on a regular phone.\
More info about the textphone protocol can be found here:
http://8times8.eeems.me:81/project/software/visicom/#h8
I don't think it is proprietary.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 18, 2014, 07:11:54 pm
Wow, if you already reversed this much then it's amazing. O.O
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on November 18, 2014, 10:13:29 pm
Quote from: aeTIos on November 18, 2014, 12:22:53 pm
Only €10 gives you a bunch of fun~ :D
It depends where you live nowadays, though. If you are unable to get your parts from the same seller and combine shipping, then you're in for $10-50 shipping per part. If you need to buy from 15 different international sellers, especially from America, and you live in Canada then you're in for between $150 and $700 worth of shipping fees, in addition to possible custom clearance fees if the post office figures out that the package is not a gift.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 19, 2014, 06:25:26 pm
Quote from: DJ Omnimaga on November 18, 2014, 10:13:29 pm
Quote from: aeTIos on November 18, 2014, 12:22:53 pm
Only €10 gives you a bunch of fun~ :D
It depends where you live nowadays, though. If you are unable to get your parts from the same seller and combine shipping, then you're in for $10-50 shipping per part. If you need to buy from 15 different international sellers, especially from America, and you live in Canada then you're in for between $150 and $700 worth of shipping fees, in addition to possible custom clearance fees if the post office figures out that the package is not a gift.
I know right. Shipping and custom fees are awful. <_<
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on November 19, 2014, 11:38:01 pm
This is why sometimes I prefer to use local brick and mortal stores, since I will not only get the stuff immediately if I find it, but also no shipping. On the other hand, their prices are way higher since they have to cover extra costs (employee paychecks, the rent, equipment, etc) so you might still be in for over $100 worth of parts. Also, you have taxes, while if you are lucky online, you might not pay them, plus some stores check Ebay prices to fix theirs, so if an item on Ebay is $5 + $25 shipping then the store will charge $28  >.<
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 19, 2014, 11:44:23 pm
Hmmm that does suck but again, Keoni's stuff is all makeshift hacks from salvaged hardware. Well, a lot of it. :P
Title: Re: Visicom Textphone Reverse-engineering
Post by: aeTIos on November 20, 2014, 11:16:01 am
Mostly, yes :P
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on November 25, 2014, 10:02:18 am
I'd like to be able to hack things like you do... Shame that my school classes have never leant me electronics... Your thing could be a neat tty for devices like calcs or RaspberryPi!
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 25, 2014, 07:48:30 pm
They did not teach me electronics in high-school. My profile-essay got me interested in electronics especially digital systems. (TI-nterface, remember?)
Ever since I have been into hobby electronics and reverse-engineering. If I manage to write a firmware for this thing I am sure I can use the internal modem to connect it and perhaps attached devices to the internet! They teach us Datacommunication at school this semester, so soon I will be an internet guru :P
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on November 25, 2014, 07:53:17 pm
Sadfully I don't have a lot of dexterity and electricity is kind of magic for me : I know the circuit basis but not so much when plugging things into said circuit.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 26, 2014, 10:28:09 am
There is this awesome thing called VHDL. It's hardware descriptive language. It allows you to create digital systems by typing in words on a keyboard. You can synthesize your designs and upload them to a configurable chip. The endresult is a chip that does exactly what you want. It's not software that's generated from your code, but hardware!
You could try that :D
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on November 26, 2014, 10:57:20 am
I know chip like PIC are programmable. That's not a problem. I meant plugging chips, lamps or any thing that needs current without setting the house on fire or destroying the circuit with an error.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 26, 2014, 11:05:10 am
That's a different kind of programmable chip. Those chips have a cpu in them that runs software. You don't design the inner circuitry in order to make it do things.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 26, 2014, 01:55:07 pm
Wow if you manage to run an IP stack on this thing it would be awesome. Telnet anyone ? :D
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 26, 2014, 03:06:21 pm
I believe it already has telnet in the firmware :)
I just need to somehow hook it up to the phone line.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on November 26, 2014, 03:36:35 pm
'Should bring a BBS back here. Telnet codewalr.us ! :3
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 28, 2014, 11:12:11 pm
I believe Juju was working on something like that for Omnimaga.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 28, 2014, 11:33:48 pm
Yeah, it should work with CodeWalrus too since we use the same forum software.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on November 28, 2014, 11:38:13 pm
Is the Omni one still up?
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on November 28, 2014, 11:38:38 pm
No it is not. Juju shut it down for unknown reasons.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on November 29, 2014, 03:23:20 am
Ah ok, I wasn't sure who hosted it, but since it's him then I'm not surprised, considering he can't even afford internet at home althogether. >.<
Title: Re: Visicom Textphone Reverse-engineering
Post by: Streetwalrus on November 30, 2014, 08:33:50 am
Yeah that, plus I don't think it was fully functional anyway.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on November 30, 2014, 05:03:06 pm
Yeah IIRC we could just login or something. Then I never heard about progress again.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on November 30, 2014, 07:10:13 pm
Yeah, that's sad that project died before a full featured version. :/ This could have been a fun way to acces Omni whil still under low speed Internet access...
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on December 04, 2014, 09:25:59 pm
I took a closer look at the disassembly of the ISR for interrupt 1 and added some comments. I found out that there are two rx buffers: One for the modem and one for something hooked up to PIA1. I don't think it is the video chip.

isr1:
fae5  b8            PUSH A               --
fae6  c8            PUSH B               --
fae7  a7  01 80 13  BTJZP %>1,P128,@>fafe -- ACIA: If a byte was received
faeb  80  81        MOVP P129,A          -- ACIA: Read received byte
faed  76  40 3c 35  BTJO %>64,R60,@>fb26 -- ? Discard byte if receive buffer is full
faf1  32  3d        MOV R61,B            -- ? Calculate offset in buffer
faf3  53  3f        AND %63,B            -- ? (Buffer size: 64 bytes)
faf5  ab  46 b2     STA @>46b2(B)        -- ? Save byte to receive buffer
faf8  d3  3d        INC R61              -- ? Increment byte counter
fafa  d3  3c        INC R60              -- ?
fafc  e0  28        JMP @>fb26           -- ? Return from isr
label:
fafe  a7  80 b1 29  BTJZP %>128,P177,@>fb2b -- ? If PIA2 triggered an IRQA1
fb02  80  b0        MOVP P176,A          -- PIA2: Read data from PORTA
fb04  80  a0        MOVP P160,A          -- PIA1: Read data from PORTA (? is value from PIA2 discarted? why?)
fb06  23  0f        AND %15,A            -- Get lowest 4 bits
fb08  76  20 3e 1a  BTJO %>32,R62,@>fb26 -- ? Return if something happens
fb0c  32  3f        MOV R63,B            -- ? Calculate offset in buffer
fb0e  53  1f        AND %31,B            -- ? (Buffer size: 32 bytes)
fb10  ab  46 f2     STA @>46f2(B)        -- ? Save byte to receive buffer
fb13  d3  3f        INC R63              -- ? Increment byte counter
fb15  d3  3e        INC R62              -- ?
fb17  73  bf 26     AND %191,R38         -- ?
fb1a  88  00 00 38  MOVD %>0000,R56      -- ?
fb1e  88  00 00 36  MOVD %>0000,R54      -- ?
fb22  88  00 00 41  MOVD %>0000,R65      -- ?
isr1_end1:
fb26  c9            POP B                --
fb27  b9            POP A                --
fb28  d5  46        CLR R70              -- ?
fb2a  0b            RETI                 -- return from interrupt
label:
fb2b  a7  80 b3 f7  BTJZP %>128,P179,@>fb26 -- ? If PIA2 triggered an IRQB1
fb2f  80  b2        MOVP P178,A          -- PIA2: Read byte from PORTB
fb31  a2  04 b3     MOVP %4,P179         -- PIA2: PORTB output register is selected
fb34  e0  f0        JMP @>fb26           -- Return from isr
fb36  76  ff 2f 01  BTJO %>255,R47,@>fb3b --
fb3a  0b            RETI                 -- return from interrupt
label:
fb3b  d2  2f        DEC R47              -- ? Decrement while R47 is not zero
fb3d  dd  2d        RRC R45              -- ? Get carry bit from DEC operation and rotate
fb3f  dd  2e        RRC R46              -- ? Rotate right R45/46
fb41  e3  04        JHS @>fb47           --
fb43  a3  f7 06     ANDP %247,P6         -- ? PORTB[3] = Carry flag
fb46  0b            RETI                 -- return from interrupt
fb47  a4  08 06     ORP %8,P6
fb4a  0b            RETI                 -- return from interrupt
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on December 06, 2014, 04:32:27 pm
Wait, those phones used assembly too? O.O

Not that I can dechiper it but it's interesting nonetheless. Sometimes, we don't realize that almost everything is a computer. >.<
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on December 06, 2014, 04:52:01 pm
Yeah this thing is almost a microcomputer. The only thing that is missing is a basic interpreter :P
I want to get my own software on it somehow. I was working on a pin adapter for my atari2600 cartridge which allows it to be used with the visicom.

For a demo I need to:
- Initialize the cpu,
- Initialize the PIA's
- Initialize the video chip
- Write to the video chip's character generator ram
- Write characters to the display
- Actually learn how to write TMS70xx assembly :P

That's right: I have been disassembling and reverse engineering w/o any knowledge of TMS70xx assembly. I learned a lot about it by looking at the disassembly though! I have not written a single line of TMS70xx assembly yet, but once I know how to do the first 5 things I will write code for it.

I know how to do most things in that list at this point. I have to look at the disassembly a bit more to make sure that I know how to do it. (Perhaps there are some hardware bugs that need to be fixed in software.)
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on December 06, 2014, 06:07:32 pm
So what's the CPU and its speed, as well as the RAM, in this thing?
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on December 06, 2014, 08:10:18 pm
Edit: The TMS70xx is rated at 5MHz, but it is clocked at 3,579545 MHz in the visicom. This is probably for timing reasons.
More specs can be found here:
http://8times8.eeems.me:81/project/software/visicom/#h1

Edit: I started probing around the board again. It appears that the ACIA is not hooked up to the modem. Instead it is used for serial communication. It is wired up to the DB25 connector at the back. I might be able to use this simple interface for debugging while I can't get video on the screen yet. It's quite easy to set the ACIA up for serial communications.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on December 07, 2014, 03:43:17 am
Ok thanks for the info :)
Title: Re: Visicom Textphone Reverse-engineering
Post by: TIfanx1999 on January 03, 2015, 02:03:57 am
Pretty neat stuff!
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 05, 2015, 09:05:04 pm
Found out that there are even more bugs in the tms7000 disassembler. So far this is the list:

Disassembler bugs:
1. Relative jump addresses are not calculated properly
Status: fixed
Relative jump offset values are added to the PC after the instruction is fetched. When an instruction is 4 bytes long the total sum is:
> PC + 4 + offset (relative to the beginning of the instruction)
offset is a value ranging from -128 to 127

2. Something wrong with opcode a8. Disassembler output:
Status: unresolved
> f749  a8  d8 9a 12  MOVD %!>(uint16=55450)0012(B),R%!d(MISSING) --
> f6f3  a8  d8 c2 12  MOVD %!>(uint16=55490)0012(B),R%!d(MISSING) --

3. Unknown vectors at the end of the rom are actually trap vectors
Status: fixed
4. Interrupt handler labels are placed incorrectly.
Status: temporary fix: got rid of it altogether
5. Trap instructions are reversed
Status: fixed
6. Several missing opcodes
Status: unresolved
7. Wrong mnemonics with certain opcodes.
Status: unresolved
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 06, 2015, 12:16:39 am
Ouch, sorry to hear. I hope this doesn't compromise your plans if you had projects with this Textphone. D:
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 06, 2015, 08:49:54 am
Most of these are easy fixes, but I just have not got around to fix them all yet. Most of these bugs indicate a lack of understanding of the cpu. I don't think the creator of the disassembler new much about the tms7000 or he was just coding very sloppy and did not check if the disassembled code would result in the same code as before it was assembled.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 10, 2015, 12:00:53 am
I wrote a quick and dirty test to see if I can get my own code to work on the visicom. It will blink an LED if all goes well. Now I have to build a pin adapter for my atari2600 backup cartridge that fits in the rom socket.
The next thing I am planning to write is a simple monitor program. It will allow me to peek and poke around in various memory locations using a terminal program on my pc.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 10, 2015, 06:12:24 am
I am curious: Why an Atari 2600 cart in particular? Is it for compatibility reasons or is it just easier to work with for this particular hardware?
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 10, 2015, 12:18:55 pm
Just because it's the fastest way to get a rom onto this device with the hardware I have at my disposal.

Edit: Just finished building the pin adapter. The blinking light program works!
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 11, 2015, 04:56:51 pm
I have been busy figuring out how to use all the peripherals of the visicom. So far I can:
- Set up the serial clock generator.
- Control the MCU's internal I/O port.
- Use interrupts
- Read and write data over serial (using the ACIA)
- Read keystrokes from the keyboard

I solved some interrupt problems by looking at the disassembly. It seems like the people who designed this thing ran into the same problems as I did :P
Next I want to output characters on the screen.

(https://codewalr.us/proxy.php?request=http%3A%2F%2F8times8.eeems.me%3A81%2Fproject%2Fsoftware%2Fvisicom%2Fmedia%2Ftest.jpg&hash=16260701a8166bf96afebb67bab65182)
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 11, 2015, 06:36:38 pm
You ruined a $700 Atari game?? O.O just kidding, good job so far.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 11, 2015, 06:54:44 pm
Here is a sample of what the serial output looks like. After this boot message you can type text in the terminal and it will echo every character back. It does not process the input yet.
(https://codewalr.us/proxy.php?request=http%3A%2F%2F8times8.eeems.me%3A81%2Fproject%2Fsoftware%2Fvisicom%2Fmedia%2Fterminal.png&hash=8c81451277fa3ff391c07baff838afa8)
I am going to write a simple monitor program that allows me to read/write from/to memory locations. This way I can find out how certain aspects of the device work such as the video chip.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 11, 2015, 07:07:22 pm
It would be cool if you ported Illusiat 81 to this :P

Also this needs an ASCII :walrii: 
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 11, 2015, 08:06:24 pm
Started working on the monitor program. The source can be found here:  https://github.com/keoni29/visicom
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 11, 2015, 10:14:33 pm
Wow this is progressing fast! O.O
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 11, 2015, 11:26:40 pm
RX buffer
User text input is now buffered. You can read bytes from the buffer sequentially as a stream. The buffer is 64 bytes long.
Serial and keyboard use the same input buffer, so the main program does not see the difference between my computer controlling it or the build-in keyboard. This makes things a bit easier.

TX
Serial output is still unbuffered, but I want to make a text output buffer as well. This could be useful if I want to print text to both the screen and serial without slowing down the main program.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 12, 2015, 03:51:38 am
How fast is text displayed?
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 12, 2015, 07:38:00 am
Right now serial speed is 1200 baud for stability, but I might be able to crank it up to 19200.
1200 baud means about 110 characters per second.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on January 12, 2015, 07:40:20 am
Aw yess. Could set it to the 9600 bauds standard?
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 12, 2015, 04:59:32 pm
The crystal frequency used to drive the clock generator is slightly off, so the closest thing to 9600 is 9560 baud. It might be fine. I am gonna test this in a bit.

Edit: Sending data with this slight difference in baud rate works fine, but receiving it results in some errors. I should get a crystal with the right frequency.
The frequency it runs on at the moment is 4,4336MHz and what I need is 4,4544MHz. I bet they used this crystal frequency because it was used a lot in television equipment, so it was cheap and close enough.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 12, 2015, 10:22:37 pm
I just pushed todays commits to the monitor program. It can now detect bad user input and it will respond adequately :trollface:

Monitor syntax
- Valid characters are 0-9 and A-F and spaces as separator characters.
- Valid hexadecimal needs to be a multiple of two characters long.

Example of good input:
4000 12 3456 AB CD EF

12AB65cd33 6692aB

Example of bad input & punishment:
Hello
?
help
?
h
?
:q!
?
001 55 Ab
?
0001 55 Ab C
?
???????
?
MAKE IT STOP
?
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 13, 2015, 01:12:49 am
You should make it so that you lose THE GAME :trollface:
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on January 13, 2015, 09:04:12 am
Too many characters. Only got 4k to work with at the moment.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on January 13, 2015, 07:58:31 pm
How does THE GAME doesn't fit in 4K? <_< (no I didn't mean to include the trollface :P)
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on January 14, 2015, 09:38:16 am
"YOU LOST\n" 10 bytes. Sold. (edit because I forgot the null character)
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on April 11, 2015, 09:47:14 pm
I have plans of porting the operating system I have on my cbs6000 and z820 to the visicom. Because these three machines have different cpu architectures the OS has to be written from scratch every time.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on April 12, 2015, 04:42:59 am
Hey @Keoni29 nice to see you again. I was wondering if school and stuff would allow you to come back. Glad you plan to port the cbs6000/z820 OS to the visicom, but it sucks that you have to do it >.<. Good luck!
Title: Re: Visicom Textphone Reverse-engineering
Post by: Keoni29 on April 12, 2015, 10:55:21 am
I still have plenty of school stuff to do, but much less than before, so I am taking on some projects again.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on April 12, 2015, 11:08:23 am
Good luck Keoni having your way with projects and school! ;)
Title: Re: Visicom Textphone Reverse-engineering
Post by: Snektron on April 12, 2015, 11:28:56 am
It _is_ the time of the year for school things, i've noticed .-.
Title: Re: Visicom Textphone Reverse-engineering
Post by: Duke "Tape" Eiyeron on April 12, 2015, 12:14:46 pm
Yeah, that's the end of line for our projects and the start of the lesson hell for the exams to come.
Title: Re: Visicom Textphone Reverse-engineering
Post by: DJ Omnimaga on April 14, 2015, 07:00:06 am
Quote from: Cumred_Snektron on April 12, 2015, 11:28:56 am
It _is_ the time of the year for school things, i've noticed .-.
September as well, especially in USA where people take the ACT and SAT IIRC. Most calc help forums get fairly busy during the second half of August and early September, then again in October, while project-oriented forums gets busy in November and March (and sometimes July as well if one year in particular a forum has many users that don't go out as much :P)

I'm glad I'm out of school now. I was really tired of all the work I had to do outside school. At least with a job you usually work hard at work, then once your work shift has ended, it's over. On the other hand, some jobs are much more demanding physically.