DIY PS/2 keyboard to Amiga 500? - Page 2

danko · 14 August 2016, 12:42

Interested in this project year ago tested this pcb with usb ps2 adapter works fine!,is possible modify schematics with eagle cad and change the ps2 connector with USB Type A Connectors? in the eagle part number is PN87520-S,please let me know if have more times for this mod.

katarakt · 01 December 2018, 19:18

Can someone post a picture from this adapter please ?

arymanx · 02 December 2019, 18:38

What value of capacitor should I use? Is it really needed?

danko · 12 December 2019, 18:07

Quote:

Originally Posted by arymanx

What value of capacitor should I use? Is it really needed?

I seem to remember 100nf.
Sorry for the delay.............

danko · 12 December 2019, 18:08

Quote:

Originally Posted by katarakt

Can someone post a picture from this adapter please ?

Hi,see this render....

arymanx · 23 December 2019, 16:11

Actual picture of working item, if someone still interested. Just assembled and tested. Thank you Solo761.

danko · 29 December 2019, 17:15

Quote:

Originally Posted by arymanx

Actual picture of working item, if someone still interested. Just assembled and tested. Thank you Solo761.

Why didn't you solder ps/2 connector? have you connected a usb connector?

arymanx · 02 January 2020, 20:44

Quote:

Originally Posted by danko

Why didn't you solder ps/2 connector? have you connected a usb connector?

Hi danko, sorry for late reply, I was away. I used this adapter in custom made desktop case, I may send you more pictures if you provide me your email.

arymanx · 02 January 2020, 21:08

Quote:

Originally Posted by danko

Why didn't you solder ps/2 connector? have you connected a usb connector?

I just noticed that you asked in past about USB connector as well. USB connector can be attached, I can provide picture or diagram how to do this.
Please remember that only PS2 compatible keyboard will work in USB connector.

danko · 03 January 2020, 10:53

Quote:

Originally Posted by arymanx

I just noticed that you asked in past about USB connector as well. USB connector can be attached, I can provide picture or diagram how to do this.
Please remember that only PS2 compatible keyboard will work in USB connector.

No more pics are needed, but your opinion, if you put a USB connector and you connect a USB keyboard it works?

arymanx · 04 January 2020, 16:17

Quote:

Originally Posted by danko

No more pics are needed, but your opinion, if you put a USB connector and you connect a USB keyboard it works?

Yes it will work but as I stated earlier not with every one USB keyboard (won't work with USB HID protocol), but many older USB and some new one still support PS2 protocol. Actually I connected USB keyboard for tests via usb to ps2 adapter ( https://www.amazon.co.uk/StarTech-co...9ZNHXRYTRFSAMX ) which is just "passed through". Good luck with your project.

danko · 04 January 2020, 17:11

I intended to connect directly this https://ae01.alicdn.com/kf/H1ed0ce8f...df401e80fT.jpg

without ps/2 i wanted your opinion otherwise opt for another project.
Thanks

arymanx · 04 January 2020, 18:00

Quote:

Originally Posted by danko

I intended to connect directly this https://ae01.alicdn.com/kf/H1ed0ce8f...df401e80fT.jpg

without ps/2 i wanted your opinion otherwise opt for another project.
Thanks

Yes it will work (isn't better to use this cable https://www.aliexpress.com/item/3285...f-a483b854b146 , bit more cost maybe)

I have few spare PCB if you are interested in one. I can send you if you cover postage .

danko · 05 January 2020, 09:59

Quote:

Originally Posted by arymanx

Yes it will work (isn't better to use this cable https://www.aliexpress.com/item/3285...f-a483b854b146 , bit more cost maybe)

I have few spare PCB if you are interested in one. I can send you if you cover postage .

Send PM.

torsti76 · 27 January 2020, 19:55

Did anyone ever try to program the MMKeyboard firmware into an actual 12F629?

I ask because whatever I try, the programmer complains about the size of the hex file. And when I toggle the corresponding ignore switch the programmer complains with "out of addresses".

However, I'd really like to get that going, because the 12F629 in SMD package is so small and fits so snuggly behind a PS/2 PCB mount port...

dalek · 27 January 2020, 22:38

Not sure about a 12F629 but kipper2k has mmkeyboard hex and source asm files for the 16F628A which you can get in a SMD package so you could possibly work with that. See here:

http://eab.abime.net/showpost.php?p=...postcount=1721

torsti76 · 27 January 2020, 23:32

Thank you for pointing this out.

However, I already had PCBs made for the 12F629 (SOIC8). The 16F628, unfortunately, has 18 pins.

I contacted Guido Mersmann directly and hope he will reply. In fact, the first PIC he used, the 16F84(A), is very similar to the 12F629 in terms of available RAM and Flash. But maybe he's even still got the source code for the 12F629 variant and is willing to share it...

torsti76 · 28 January 2020, 19:24

Just to confirm it's working now with the original MMKeyboard 4.10 firmware.

The trick was to program the device with PicKit 2 via ICSP. Fortunately, in my adapter, I broke out the VPP/MCLR signal to an unused pin on the Mini-DIN Socket while usually pulling it to VCC via a resistor and a diode. (The diode prevents the high VPP voltage from feeding back to VCC/VDD during programming.)

Thus, it was just a matter of making a cable to connect to the programmer.

I'm not sure why only the ICSP method works. Programming the chip directly in my TL866 did not.

Edit: Attached a photo of the adapter just to show you how small the footprint is with the 12F629. :-)

dr.doc · 29 October 2020, 07:58

Quote:

Originally Posted by torsti76

Just to confirm it's working now with the original MMKeyboard 4.10 firmware.

Hi, do you have a schematic for the MMKeyboard adapter using the PIC12F629?

Thanks!
Doc

Evil_Ed · 10 December 2020, 11:25

Recently I built an interface for the Amiga 2000 and i have a really strange thing happening, perhaps someone knows what the issue can be ?

If i turn on the A2000 , the first key i press is misinterpreted , if for example i press an 'a' , there wil be a '2' shown, then a lot of 2's automatically follow.
Did not test all keys, but the keys that i tested all give a different character on screen than the one i pressed.

If i warm reboot the amiga everything goes well , so perhaps it is a timing issue of some sort, i really have no clue how to change / compile the disassembled code so i hope someone has an idea.

23 December 2019, 16:11	#26
arymanx Registered User Join Date: Nov 2019 Location: Luton/UK Posts: 7	Actual picture of working item, if someone still interested. Just assembled and tested. Thank you Solo761. Attached Thumbnails

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14 August 2016, 12:42	#21
danko Registered User Join Date: Oct 2009 Location: Italy Age: 45 Posts: 196	Interested in this project year ago tested this pcb with usb ps2 adapter works fine!,is possible modify schematics with eagle cad and change the ps2 connector with USB Type A Connectors? in the eagle part number is PN87520-S,please let me know if have more times for this mod.

01 December 2018, 19:18	#22
katarakt Registered User Join Date: Jul 2017 Location: Germany Posts: 205	Can someone post a picture from this adapter please ?

02 December 2019, 18:38	#23
arymanx Registered User Join Date: Nov 2019 Location: Luton/UK Posts: 7	What value of capacitor should I use? Is it really needed?

04 January 2020, 17:11	#32
danko Registered User Join Date: Oct 2009 Location: Italy Age: 45 Posts: 196	I intended to connect directly this https://ae01.alicdn.com/kf/H1ed0ce8f...df401e80fT.jpg without ps/2 i wanted your opinion otherwise opt for another project. Thanks

27 January 2020, 19:55	#35
torsti76 Registered User Join Date: May 2018 Location: Germany, Baden-Wuerttemberg Posts: 387	Did anyone ever try to program the MMKeyboard firmware into an actual 12F629? I ask because whatever I try, the programmer complains about the size of the hex file. And when I toggle the corresponding ignore switch the programmer complains with "out of addresses". However, I'd really like to get that going, because the 12F629 in SMD package is so small and fits so snuggly behind a PS/2 PCB mount port...

27 January 2020, 22:38	#36
dalek Registered User Join Date: Nov 2014 Location: NSW/Australia Posts: 462	Not sure about a 12F629 but kipper2k has mmkeyboard hex and source asm files for the 16F628A which you can get in a SMD package so you could possibly work with that. See here: http://eab.abime.net/showpost.php?p=...postcount=1721

27 January 2020, 23:32	#37
torsti76 Registered User Join Date: May 2018 Location: Germany, Baden-Wuerttemberg Posts: 387	Thank you for pointing this out. However, I already had PCBs made for the 12F629 (SOIC8). The 16F628, unfortunately, has 18 pins. I contacted Guido Mersmann directly and hope he will reply. In fact, the first PIC he used, the 16F84(A), is very similar to the 12F629 in terms of available RAM and Flash. But maybe he's even still got the source code for the 12F629 variant and is willing to share it...

28 January 2020, 19:24	#38
torsti76 Registered User Join Date: May 2018 Location: Germany, Baden-Wuerttemberg Posts: 387	Just to confirm it's working now with the original MMKeyboard 4.10 firmware. The trick was to program the device with PicKit 2 via ICSP. Fortunately, in my adapter, I broke out the VPP/MCLR signal to an unused pin on the Mini-DIN Socket while usually pulling it to VCC via a resistor and a diode. (The diode prevents the high VPP voltage from feeding back to VCC/VDD during programming.) Thus, it was just a matter of making a cable to connect to the programmer. I'm not sure why only the ICSP method works. Programming the chip directly in my TL866 did not. Edit: Attached a photo of the adapter just to show you how small the footprint is with the 12F629. :-)

10 December 2020, 11:25	#40
Evil_Ed Registered User Join Date: Jun 2020 Location: eindhoven Posts: 4	Recently I built an interface for the Amiga 2000 and i have a really strange thing happening, perhaps someone knows what the issue can be ? If i turn on the A2000 , the first key i press is misinterpreted , if for example i press an 'a' , there wil be a '2' shown, then a lot of 2's automatically follow. Did not test all keys, but the keys that i tested all give a different character on screen than the one i pressed. If i warm reboot the amiga everything goes well , so perhaps it is a timing issue of some sort, i really have no clue how to change / compile the disassembled code so i hope someone has an idea.

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