UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Computers

Notices

Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

Closed Thread
 
Thread Tools
Old 10th May 2020, 3:15 pm   #1
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default PIC 14 Karen

A new thread for those who want to realize this great training tool, the PCB is made with eagle.

I give the first version of KAREN for the programming of the PIC see its thread my 3d boxe
https://www.thingiverse.com/thing:4315778
I handed over this project for the containment box requires. version 2 is in progress the pcb is in manufacture at JLPCB
I would follow up after the test
Attached Thumbnails
Click image for larger version

Name:	pic14_7_pcb.png
Views:	228
Size:	68.9 KB
ID:	205419   Click image for larger version

Name:	pic14_1.jpg
Views:	225
Size:	76.1 KB
ID:	205420  
Attached Files
File Type: zip pic14_7.zip (46.1 KB, 111 views)
File Type: pdf pic14_7board.pdf (124.1 KB, 122 views)
File Type: pdf pic14_7sch.pdf (83.7 KB, 128 views)
philoupat83 is offline  
Old 10th May 2020, 3:39 pm   #2
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,471
Default Re: PIC 14 Karen

I have a question about the PIC14: As far as I remember, the PIC14 executes code at full speed from RAM, and at half speed from ROM.

The PIC18F452, 100% pin compatible with the 16F877, can use a 'PLL Mode' clock where the device can multiply a 10MHz clock 4 times to give an effective 40MHz clock.

If the PIC14 code was programmed into a PIC18F452 with the clock so configured, then I guess it would run ROM code at full speed and RAM code at double normal speed.

Would it then be possible to alter the PIC code a little to bring RAM code speed back down to normal speed? If so, the PIC14 would then run all code at the original speed, or at least original speed for a 4MHz clock.
SiriusHardware is offline  
Old 10th May 2020, 4:12 pm   #3
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

Maybe this is possible I am for the moment on the project with timbucus of the SCRUMPI but Karen could bring clarification the assembler code is open so modifiable to change from PIC the containment this ends for me back to work alternating for the moment
but I think in karen’s explanation she already gives the timing
the original program works clock etc. the PIC 16F runs with 20MHZ
philoupat83 is offline  
Old 10th May 2020, 4:27 pm   #4
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,471
Default Re: PIC 14 Karen

Indeed, my PIC14 has 16F877 +20MHz at the moment.

I have always wondered whether it would be possible to have full speed emulation from both RAM and ROM if the clock was 40MHz, but the 16F877 can not operate at that speed.
SiriusHardware is offline  
Old 13th May 2020, 12:53 am   #5
electroanorak
Hexode
 
electroanorak's Avatar
 
Join Date: Apr 2007
Location: Tonyrefail, Rhondda, South Wales, UK.
Posts: 336
Default Re: PIC 14 Karen

I can program any PIC FOC if you need it.

Daniel.
electroanorak is offline  
Old 13th May 2020, 1:01 am   #6
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,471
Default Re: PIC 14 Karen

Thanks Daniel, I have a Pickit2 and ICD3 here and I think philoupat83 is also sorted that way, but the thought was appreciated.
SiriusHardware is offline  
Old 13th May 2020, 9:49 pm   #7
electroanorak
Hexode
 
electroanorak's Avatar
 
Join Date: Apr 2007
Location: Tonyrefail, Rhondda, South Wales, UK.
Posts: 336
Default Re: PIC 14 Karen

Good luck, Let me know if you ever need help.

Daniel.
electroanorak is offline  
Old 14th May 2020, 8:04 pm   #8
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

Good evening
Yes, I have the equipment to program the PIC all.
I received today the pcbs of JLPCB as possible I would assemble to control (I cross the fingers)
I have an NSA 1588 display so I have to check if it’s compatible?
and I miss the 9 pin connector but nothing serious
philoupat83 is offline  
Old 14th May 2020, 8:05 pm   #9
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

pcb
Attached Thumbnails
Click image for larger version

Name:	pic14 v2.jpg
Views:	187
Size:	104.1 KB
ID:	205840  
philoupat83 is offline  
Old 14th May 2020, 8:24 pm   #10
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,471
Default Re: PIC 14 Karen

Superb looking PCB. We will let you try one out and then if it works, you may suddenly find that everyone wants to be your friend.

I see two modules there. One is obviously a USB-Serial to TTL-level converter for the serial download.

The other... a Lithium battery charger / power manager circuit?

Information about the connections of the original display in post #252 on this page:

https://vintage-radio.net/forum/show...145663&page=13

Some more useful information regarding compatible displays in post #261 on this page:

https://vintage-radio.net/forum/show...145663&page=14

You can usually use a DMM on its 'Diode Test' range to power and faintly illuminate each of the segments in the display so you can quickly work out all the connections on your display.

Although the original display was 9-digit, the first digit (on the left) is not used on the MK14 so you can use an 8-digit display.

The display which is in my PIC14 was tested in my MK14 first.
SiriusHardware is offline  
Old 15th May 2020, 8:39 pm   #11
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

Hello
thanks for it’s note I started assembling some photos for you
I love this project thanks Karen.
you would notice that I put his signature at the bottom of the pcb
Attached Thumbnails
Click image for larger version

Name:	P1130698.jpg
Views:	128
Size:	104.1 KB
ID:	205916   Click image for larger version

Name:	P1130699.jpg
Views:	127
Size:	89.5 KB
ID:	205917   Click image for larger version

Name:	P1130701.jpg
Views:	148
Size:	88.4 KB
ID:	205918  
philoupat83 is offline  
Old 16th May 2020, 10:29 pm   #12
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,471
Default Re: PIC 14 Karen

I notice you have included the digit-driver base resistor bypass capacitors - Karen said there was an issue with the digit driver transistors not switching quickly enough and offered those capacitors as the eventual solution.
SiriusHardware is offline  
Old 19th May 2020, 11:08 pm   #13
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

hello
yes but in version 1 j used BC547A and I did not put the capacitor on version 2 I preview them as prescribed Karen may still with BC547A
I would soon take pictures of the circuit
philoupat83 is offline  
Old 20th May 2020, 9:10 am   #14
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,471
Default Re: PIC 14 Karen

What is the white connector on the left hand side beside the PIC for?
SiriusHardware is offline  
Old 20th May 2020, 11:28 am   #15
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

Hello
the connector is used for output and input as Karen intended them in version 2
SIN SOUT F F1 F2 etc see karen projet
philoupat83 is offline  
Old 23rd May 2020, 9:25 pm   #16
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

see
https://vintage-radio.net/forum/showthread.php?t=149829
philoupat83 is offline  
Old 29th May 2020, 5:32 pm   #17
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

hello
then the pcb is almost assembled and the display is missing.
good errors but nothing serious
see pictures
Attached Thumbnails
Click image for larger version

Name:	v2_1.jpg
Views:	122
Size:	80.9 KB
ID:	207132   Click image for larger version

Name:	v2_2.jpg
Views:	135
Size:	87.4 KB
ID:	207133   Click image for larger version

Name:	v2_3.jpg
Views:	147
Size:	103.0 KB
ID:	207134  
philoupat83 is offline  
Old 30th May 2020, 8:59 am   #18
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,362
Default Re: PIC 14 Karen

Looking good - we are both playing with the MK14 while waiting then...
Timbucus is offline  
Old 3rd Jun 2020, 9:07 pm   #19
philoupat83
Pentode
 
Join Date: Jul 2017
Location: Toulon, France
Posts: 239
Default Re: PIC 14 Karen

Hello
I received the display
the pic14 v2 of karen works see the photo I left the boxed and the led interface
Attached Thumbnails
Click image for larger version

Name:	P1130711.jpg
Views:	156
Size:	80.8 KB
ID:	207582  
philoupat83 is offline  
Old 3rd Jun 2020, 9:12 pm   #20
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,471
Default Re: PIC 14 Karen

Slothie will be thinking he is a Rock Star by now. (Well, maybe he is?).

That's very good work Phil - is that now the final version?
SiriusHardware is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 7:34 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.