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Home » RBC Forums » General Discussion » uTerm-S: a little low cost VT100-like terminal (VT100-like terminal with VGA out, PS/2 keyboard, RS232 and a "transparent" Serial-USB connector)
uTerm-S: a little low cost VT100-like terminal [message #6352] Mon, 27 May 2019 03:57 Go to next message
just4fun is currently offline  just4fun
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Because I need "some" VT100 terminals for new experiments, I've done the "stand-alone" version of the uTerm (the VT100 terminal board for the Z80-MBC2), the uTerm-S:

/forum/index.php?t=getfile&id=1408&private=0

Currently testing the RTS/CTS HW handshaking of the "transparent" serial-USB port of uTerm-S (it allows to use a terminal emulator on a PC i.e. to exchange files with XMODEM while the terminal is in use). Because both RTS/CTS signals are needed on the serial-USB adapter, I soldered a 2 pins connector on it...

/forum/index.php?t=getfile&id=1409&private=0
/forum/index.php?t=getfile&id=1410&private=0

I'll publish all the details after some testing.

[Updated on: Mon, 27 May 2019 04:02]

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Re: uTerm-S: a little low cost VT100-like terminal [message #6482 is a reply to message #6352] Mon, 26 August 2019 00:31 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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As currently I'm playing with other "things" and haven't the time to publish a decent article, I put here all the needed files to build it (including the FW).

uTerm-S is very similar to the uTerm board for the Z80-MBC2, so you can find here many useful info.

uTerm-S can run same FW of the uTerm, but here I've attached a new version that let you to select the serial speed @ 115200, 19200 or 9600.

Note about the MAX232: if you use a "chinese" MAX232 take into account that they generally "suffer" the "latch-up" syndrome (search on google for "burning MAX232"). Anyway you can use them if you know the trick...

For any question ask in this thread...

[Updated on: Tue, 27 August 2019 23:30]

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Re: uTerm-S: a little low cost VT100-like terminal [message #6485 is a reply to message #6482] Tue, 27 August 2019 01:39 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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ops... wrong post...

[Updated on: Tue, 27 August 2019 01:41]

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Re: uTerm-S: a little low cost VT100-like terminal [message #6487 is a reply to message #6485] Tue, 27 August 2019 04:26 Go to previous messageGo to next message
b1ackmai1er is currently offline  b1ackmai1er
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Hi,

No luck trying to upload the Gerbers to JLCPCB.

Any ideas?

Thanks
Re: uTerm-S: a little low cost VT100-like terminal [message #6488 is a reply to message #6487] Tue, 27 August 2019 05:21 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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Ahh.... JLCPCB is the only one who wants the X2 attribute set (Kicad):

/forum/index.php?t=getfile&id=1494&private=0

I've attached here the gerber they like...

BTW: the others services seem do not like this file with X2 enabled... Sad
Re: uTerm-S: a little low cost VT100-like terminal [message #6489 is a reply to message #6488] Tue, 27 August 2019 06:49 Go to previous messageGo to next message
b1ackmai1er is currently offline  b1ackmai1er
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Thanks that worked perfectly Smile ... spent a few hours on this ... would never have known that!

Regards Phil.
Re: uTerm-S: a little low cost VT100-like terminal [message #6513 is a reply to message #6489] Wed, 04 September 2019 01:05 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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I've done an "easy link" to order a small batch of PCB (min. 5pcs) here: https://www.pcbway.com/project/shareproject/uTerm_S_stamd_al one_RS232_VT100_terminal_with_VGA_PS2.html
Re: uTerm-S: a little low cost VT100-like terminal [message #6530 is a reply to message #6513] Wed, 11 September 2019 04:23 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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Here how to select the baud-rate using a jumper on J1 (AUX).
J1 is checked only after a power-on or a reset.
Please use only pin 1, 2 and 3 of J1 as in the following image:

/forum/index.php?t=getfile&id=1510&private=0

BTW: you can flash it in the uTerm (A071218-R290319) too...
  • Attachment: Jumpers.jpg
    (Size: 53.81KB, Downloaded 1351 times)

[Updated on: Wed, 11 September 2019 04:30]

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Re: uTerm-S: a little low cost VT100-like terminal [message #6532 is a reply to message #6530] Wed, 11 September 2019 07:11 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Waiting for PC boards to arrive...

Any notes on how to flash the CPU?

Thanks for what looks like a great project!

- Gary
Re: uTerm-S: a little low cost VT100-like terminal [message #6533 is a reply to message #6532] Wed, 11 September 2019 10:33 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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@gkaufman: Thanks!

You should use a "ST-LINK v2" programmer connected to J4 (SWD) and follow carefully the steps explained for the previous uTerm board in the paragraph "HOW TO FLASH THE STM32 WITH THE ST-LINK V2" here.


Anyway there is an other way that doesn't require any "programming dongle", but you can just use the serial RS232 port (J7) or a serial-USB adapter attached to J3 (SER-USB) and connect it to a RS232 or USB port on a PC . You have to jumper JP1 (BOOT0) to enable the serial bootloader inside the STM32 MCU (every STM32 has a factory serial bootloader) and use a STM serial flash utility like this one.
After the upload, you have to remove the jumper on JP1 for normal operations.
I haven't tested this way with this board (having a ST-LINK V2 programmer), but it should work too...
Re: uTerm-S: a little low cost VT100-like terminal [message #6534 is a reply to message #6533] Thu, 12 September 2019 08:59 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Thanks, the ST-Link V2 is quite inexpensive. I ordered one via AliExpress, hopefully it will arrive before xmas...

- Gary

Re: uTerm-S: a little low cost VT100-like terminal [message #6548 is a reply to message #6534] Tue, 17 September 2019 02:44 Go to previous messageGo to next message
b1ackmai1er is currently offline  b1ackmai1er
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Boards arrived Smile Waiting on Aliexpress now too :0
Re: uTerm-S: a little low cost VT100-like terminal [message #6558 is a reply to message #6352] Sat, 21 September 2019 02:15 Go to previous messageGo to next message
b1ackmai1er is currently offline  b1ackmai1er
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Hi J4F,

Great news... well first steps at least. I have soldered my first STM32 SMD component onto the board.

It did take quite a few attempts so I am concerned that I might have cooked it.

Are you able to suggest a way to test the stm32 is ok before fully building?

For example, can I install power supply, oscillator and connect to boot loader to verify that it is alive?

Thanks.
Re: uTerm-S: a little low cost VT100-like terminal [message #6561 is a reply to message #6558] Sat, 21 September 2019 08:29 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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b1ackmai1er wrote on Sat, 21 September 2019 11:15
Hi J4F,
Are you able to suggest a way to test the stm32 is ok before fully building?

Yes, you need only R9 and J4 (SWD) assembled (and U3 of course...) to download the FW using ST-LINK V2.

The power (3.3V) is provided by the ST-LINK V2 (check that you are using the 3.3V pin and not the 5V one!).

See the needed components in the photo inside the red line:

/forum/index.php?t=getfile&id=1515&private=0

If you can download (and verify) the FW into the STM32 there are very good chances that it works....


A second step could be the video output. If I remember well assembling C3, C4, C8, C9, Y1, R11, C11, R12, R13, Q3, R29, R14, R21, J6 you should see the blinking cursor (powering from the ST-LINK V2) on a VGA monitor.

Hope this will help...
Re: uTerm-S: a little low cost VT100-like terminal [message #6563 is a reply to message #6561] Sat, 21 September 2019 17:55 Go to previous messageGo to next message
b1ackmai1er is currently offline  b1ackmai1er
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Perfect. thank you Smile
Re: uTerm-S: a little low cost VT100-like terminal [message #6709 is a reply to message #6563] Fri, 25 October 2019 15:48 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Terminal went together easily. I'm not sure how it compares with Geoff Graham's Ascii Video Terminal yet.

I'm having a strange behavior entering a ^L (newline) from the PS-2 keyboard. If you use the left keyboard control key it acts as expected, if you use the right keyboard control key it leaves the terminal in a confused state which returns to normal when a ^L is again entered with the left control key.

I'm testing it as a terminal hooked to a laptop, and have used several terminal emulator software packages.

Is the source for the VT100 emulation easy to locate and recompile?

- Gary
Re: uTerm-S: a little low cost VT100-like terminal [message #6716 is a reply to message #6709] Sat, 26 October 2019 10:41 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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@gkaufman

Here the full source project (attached zip file).
To compile you need to install Keil uVision and open the project file:

STM32F030F4 VGA.uvproj

Because the flash is under the 32KB limit, the free version is ok.

The VT100 emulation is in the file ansi.c

May the Force be with you...
Re: uTerm-S: a little low cost VT100-like terminal [message #6718 is a reply to message #6716] Sun, 27 October 2019 13:51 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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I think the problem is in the keyboard handler.

Looking at the source it looks like ps2.c has

switch (c)
{
case LEFT_CONTROL_KEY:
Modifiers|=CONTROL_MODIFIER;
return;
...
}

but no case for "RIGHT_CONTROL_KEY support.

- Gary
Re: uTerm-S: a little low cost VT100-like terminal [message #6727 is a reply to message #6718] Tue, 05 November 2019 06:32 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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@just4fun -

I changed the ps2.c code to include this small change in both the Key_Up and Key_Down routines (you need to make the change in two places).

The right control key now functions correctly.

The right alt key also appears to be incorrectly coded, but as the ALT_MODIFIER doesn't appear to actually be used it's probably not an issue that's worth fixing.

The parity function appears "hard coded", probably not an issue for most intended uses.

Could you also distribute the code for the "dedicated" uTerm so I can make the changes in that firmware too?

Many thanks for a tremendous project!!

- Gary

In static void Key_Down(uint8_t key)...

switch (c)
{
case LEFT_CONTROL_KEY:
case RIGHT_CONTROL_KEY:
Modifiers|=CONTROL_MODIFIER;
return;
...
}

In static void Key_Up(uint8_t key)...

switch (c)
{
case LEFT_CONTROL_KEY:
case RIGHT_CONTROL_KEY:
Modifiers&=~CONTROL_MODIFIER;
return;
...
}


gkaufman wrote on Sun, 27 October 2019 13:51
I think the problem is in the keyboard handler.

Looking at the source it looks like ps2.c has

switch (c)
{
case LEFT_CONTROL_KEY:
Modifiers|=CONTROL_MODIFIER;
return;
...
}

but no case for "RIGHT_CONTROL_KEY support.

- Gary
[/b]
Re: uTerm-S: a little low cost VT100-like terminal [message #6728 is a reply to message #6727] Tue, 05 November 2019 10:10 Go to previous messageGo to next message
norwestrzh is currently offline  norwestrzh
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Hi Gary,
I've got one of those Geoff Graham ASCII terminals (v. 1.3) that you kindly made available. It's a great little terminal, but the font is kind of funky. I understand why that is so (limited space in the micro-controller). I wonder if you could compare the u-Term to it? Maybe I ought to get some PCBs and try to build a u-Term???

Thanks.

Roger
Re: uTerm-S: a little low cost VT100-like terminal [message #6729 is a reply to message #6727] Tue, 05 November 2019 10:58 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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gkaufman wrote on Tue, 05 November 2019 15:32

Could you also distribute the code for the "dedicated" uTerm so I can make the changes in that firmware too?

Hi, thanks so much for your help. Really very appreciated!! Cool

Here I've attached the sources for the uTerm (HW ref.: A071218-R290319).

Anyway you can just flash onto it (HW ref.: A071218-R290319) the same bin used for the uTerm-S (HW ref.: A200419) because they are 100% compatible for the FW.

Next days I'll post here the new bin file (v2) for the uTerm-S (HW ref.: A200419) so anyone can upgrade.


@norwestrzh

Here an image of the output (here is white but you can change the color) . I haven't the other terminal so I can't say more...

/forum/index.php?t=getfile&id=1560&private=0


Re: uTerm-S: a little low cost VT100-like terminal [message #6730 is a reply to message #6728] Tue, 05 November 2019 11:08 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Roger -

My initial impression is that the uTerm has a better font and crisper display. I've just started looking at the code and it seems very straight forward to modify. The single surface mount may deter some folks, but it's pretty easy to solder. The documentation is first rate (thanks Fabio!Wink

The Geoff Graham Ascii terminal is easier to build (less parts, no surface mount) but unfortunately does requires external TTL<-->RS232 conversion.
It also is much more flexible (baud, bits, parity) with on-screen setup.

I'd love to see someone come up with a good 3D printable case for both of these. Wish I had the time and skill to design one.

I do have a few spare PC boards for uTerm, uTerm-S and Geoff Graham's Ascii Terminal and can help with programming CPU's

- Gary
Re: uTerm-S: a little low cost VT100-like terminal [message #6731 is a reply to message #6730] Tue, 05 November 2019 11:20 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Thanks for the source file!

I didn't know if the uTerm and uTerm-S firmware were different because of the baud rate jumpering on the uTerm-S.

I can upload a corrected ps2.c and .bin this evening (I'm at work now).
Re: uTerm-S: a little low cost VT100-like terminal [message #6732 is a reply to message #6731] Tue, 05 November 2019 14:47 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Here is the revised ps2.c and compiled VGA_uTerm.bin files that seem to fix the right control issue.

It appears to work fine on both uTerm and uTerm-S now.

As a precaution to others, don't try and re-flash the uTerm while it is connected to the Z80-MBR2. My ST-Link programmer stopped working after I tried. Fortunately I had purchased a spare Smile

- Gary
  • Attachment: VGA_uTerm.bin
    (Size: 12.73KB, Downloaded 50 times)
  • Attachment: ps2.c
    (Size: 8.91KB, Downloaded 50 times)
Re: uTerm-S: a little low cost VT100-like terminal [message #6900 is a reply to message #6732] Mon, 30 December 2019 16:03 Go to previous messageGo to next message
norwestrzh is currently offline  norwestrzh
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I'm going to take a stab at trying to build a uTerm, but I'm puzzled about some components that are not listed in the BOM, nor can I find them on the schematic. Anybody know what Q4 is supposed to be? What about R24 and R25?? The capacitors around the MAX232 aren't listed, but I would guess maybe 1uf to 10 uf for the 4 connected to the charge pumps, and .1uf for the bypass cap (C17)???

Roger
Re: uTerm-S: a little low cost VT100-like terminal [message #6901 is a reply to message #6900] Mon, 30 December 2019 19:05 Go to previous messageGo to next message
jcoffman is currently offline  jcoffman
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The MAX232 charge pump caps should be 1uF, electrolytic or tantalum; the bypass cap is the same; it is just for power supply decoupling. I usually use about 10uF somewhere near the MAX232. 0.1uF bypass caps, monolithic or ceramic, should be liberally spread around a board.

Sorry, I can't speak for the other components you mention. I have not built this board.

--John
Re: uTerm-S: a little low cost VT100-like terminal [message #6902 is a reply to message #6900] Mon, 30 December 2019 19:58 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Roger -

Do you have the correct BOM from the .zip file? I see all of the values listed.

Q4 is listed alongside Q1 in the BOM, 2N7000
R24 is 220 ohm, R25 is 1K (they are also on the BOM, although you have to widen the columns to see R24)
Caps around the Max232 are all 1uf (C3, C14, C15, C16, C17, C18)

- Gary
Re: uTerm-S: a little low cost VT100-like terminal [message #6903 is a reply to message #6902] Mon, 30 December 2019 20:26 Go to previous messageGo to next message
norwestrzh is currently offline  norwestrzh
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Thanks, Gary --

I guess I don't have the correct BOM (A071218-R290319 BOM v3.ods). Those components are not included.

Roger
Re: uTerm-S: a little low cost VT100-like terminal [message #6904 is a reply to message #6903] Tue, 31 December 2019 01:15 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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Look at A200419 - Docs.zip in the second message from the top of this thread.

The BOM you're using is from the version of uTerm that attaches to the Z80-MBC2 directly, not the uTerm-S stand alone version. It doesn't have the MAX232 portion of the circuit so is missing the parts you're looking for!


Re: uTerm-S: a little low cost VT100-like terminal [message #6905 is a reply to message #6904] Tue, 31 December 2019 01:18 Go to previous messageGo to next message
gkaufman is currently offline  gkaufman
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BTW if you don't want to deal with programming the STM32 let me know. I have some spare STM32's and PC boards and can solder up/program one for you.

- Gary
Re: uTerm-S: a little low cost VT100-like terminal [message #6906 is a reply to message #6905] Tue, 31 December 2019 09:13 Go to previous messageGo to next message
norwestrzh is currently offline  norwestrzh
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Thanks for that great offer, Gary! If I'm going to continue working with electronics, I guess that I've got to learn how to do surface mount. I was thinking that the uTerm would make a good start? I've got some upgraded soldering equipment coming (slow boat from China), so I'm going to try to do this one myself (at least at first! *grin* Wink.

Roger
Re: uTerm-S: a little low cost VT100-like terminal [message #6907 is a reply to message #6906] Thu, 02 January 2020 06:11 Go to previous messageGo to next message
plasmo is currently offline  plasmo
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I've spent a lot of time on electronic assembly floors. Not to be sexist, but the assembly workers are almost always women and the best ones are older, in their 50's or even 60's. Regardless of age, everyone on the floor has a tool that most hobbyists don't have: a stereo inspection microscope. Get one, you'll find out immediately why assemblers can do amazing intricate works in their 60's.
Bill
Re: uTerm-S: a little low cost VT100-like terminal [message #6923 is a reply to message #6907] Wed, 15 January 2020 07:40 Go to previous messageGo to next message
djmartins is currently offline  djmartins
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Why not use a Raspberry Pi Zero (non W) as a terminal?
https://github.com/dhansel/pigfx
Hard to beat the price and you can use a HDMI or composite terminal.
Re: uTerm-S: a little low cost VT100-like terminal [message #6924 is a reply to message #6923] Wed, 15 January 2020 15:29 Go to previous messageGo to next message
mikesmith is currently offline  mikesmith
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djmartins wrote on Wed, 15 January 2020 07:40
Why not use a Raspberry Pi Zero (non W) as a terminal?
https://github.com/dhansel/pigfx
Hard to beat the price and you can use a HDMI or composite terminal.
RPi serial port is not 5V-tolerant...
Re: uTerm-S: a little low cost VT100-like terminal [message #6925 is a reply to message #6924] Wed, 15 January 2020 17:57 Go to previous messageGo to next message
djmartins is currently offline  djmartins
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mikesmith wrote on Wed, 15 January 2020 18:29
RPi serial port is not 5V-tolerant...

I have one of these:
https://www.ebay.com/itm/MAX3232-RS232-Serial-Port-To-TTL-Co nverter-Module-Female-DB9-COM-Serial-MAX232BE/223812307408?h ash=item341c40c9d0:g:1z4AAOSwyi1a2E9N
It has a MAX3232 IC and there are also cheap level converters out there too.
No PS2 or VGA port but USB keyboards and HDMI monitors work fine.
I was thinking of designing a 3d printed case with the serial port and composite connector built in as a tiny terminal box.
Re: uTerm-S: a little low cost VT100-like terminal [message #6947 is a reply to message #6925] Wed, 22 January 2020 18:52 Go to previous messageGo to next message
norwestrzh is currently offline  norwestrzh
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Just finished putting my first uTerm-S together. Worked right off. Excellent! I was able to solder the CPU OK -- but not the prettiest or most professional looking job. *grin* I'm still in the dark about what the little switch, marked "RTS-HS", actually does. Also, the jumper marked "boot0". Is that used if I want to re-program the CPU (not likely)? All in all, quite a nice terminal. Thanks Gary, and others, who offered advice. AND, a big thanks to just4fun for making it available!!

Roger
Re: uTerm-S: a little low cost VT100-like terminal [message #6948 is a reply to message #6947] Thu, 23 January 2020 09:54 Go to previous messageGo to next message
just4fun is currently offline  just4fun
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norwestrzh wrote on Thu, 23 January 2020 03:52
...I'm still in the dark about what the little switch, marked "RTS-HS", actually does. Also, the jumper marked "boot0"....

Hi,
the "RTS-HS" (RTS HandShaking) switch is to enable/disable the HW handshaking with RTS. Because usually only the HW handshaking with CTS is needed I've added this switch.

The BOOT0 jumper is normally not used if you have a ST-LINK v2 programmer, but if you want program the STM32 using the internal serial bootloader you must use this jumper.


Hope this can clarify... Smile
Re: uTerm-S: a little low cost VT100-like terminal [message #7011 is a reply to message #6948] Mon, 03 February 2020 09:39 Go to previous messageGo to next message
Yves-D. is currently offline  Yves-D.
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@just4fun
Kudos to you for developing the uTerm-S and making it available to the community. Works like a charm. Very crisp display on a VGA flatscreen.
I've got two of them up and running for my 68000 and Z80 SBC's

A pitfall I encountered during programming the STM32 via ST-LinkV2 :
I had to select Reset-Mode = "Software System Reset" under the Settings Tab, selecting "Hardware Reset" as indicated by your screenshots would run into a reset error.

I'd like to bring up a "feature request" for a future release of the firmware: support for different regional keyboard languages.
I know that we've quite a bit of different ones here in Europe. I luckily had an US keyboard around.

Kind regards,
Yves
Re: uTerm-S: a little low cost VT100-like terminal [message #7012 is a reply to message #7011] Mon, 03 February 2020 10:09 Go to previous message
Yves-D. is currently offline  Yves-D.
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By the way: I've 3 full kits of the uTerm-S leftover (PCB+parts). The minimum PCB order qty was 5 and I don't like having unpopulated PCB's around, so I ordered 5x the parts.
But I guess I've enough with my 2 running units and won't ever need the remaining 3.

So, if anyone's interested: I'd part with them for 35Eur per kit including shipping from Luxembourg/Europe to most parts in the world. Send me a PM.

PS: The 3 boards already have the STM32 microcontroller soldered and programmed/checked.
What you see on then picture is what you get, even the nowadays hard-to-get parts like PS/2 and VGA connector

Kind regards,
Yves

/forum/index.php?t=getfile&id=1623&private=0

[Updated on: Mon, 03 February 2020 10:15]

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