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Search: Posts Made By: Krashan
Forum: Hardware mods 27 January 2022, 18:40
Replies: 10
Views: 1,768
Posted By Krashan
As I'm the RastPort guy, I can confirm I have 8...

As I'm the RastPort guy, I can confirm I have 8 PCBs of KA71 left. Can give them away at cost of shipping. Blank boxes are available on AliExpress (SZOMK AK-C-C13). Most important components are...
Forum: News 14 January 2022, 15:21
Replies: 31
Views: 5,991
Posted By Krashan
160 EUR + 23% VAT (where applicable) + shipping...

160 EUR + 23% VAT (where applicable) + shipping (destination dependent). Current queue: 46 keyboards, estimated waiting time at end of queue is 8 months.
Forum: News 14 January 2022, 08:28
Replies: 31
Views: 5,991
Posted By Krashan
Sure. Keycaps are printed on demand and I support...

Sure. Keycaps are printed on demand and I support all the layouts sold by Commodore: US, UK, DE, FR, ES, IT, DK, SE/FI, NO, CH and IC. :-)
Please write to office@rastport.com.
"RP" keys are there...
Forum: News 09 January 2022, 10:10
Replies: 31
Views: 5,991
Posted By Krashan
I need to assemble more keyboards for photos, as...

I need to assemble more keyboards for photos, as I have send all out... Matter of two or three weeks.
Forum: News 02 January 2022, 22:07
Replies: 31
Views: 5,991
Posted By Krashan
I've set up a preliminary product page for KA59...

I've set up a preliminary product page for KA59 keyboard on rastport.com. At the moment it contains illustrated instalation guide. More informations and photos will follow.
...
Forum: support.Hardware 02 January 2022, 21:17
Replies: 21
Views: 1,763
Posted By Krashan
Leaving open source aside, note that Indivision...

Leaving open source aside, note that Indivision reads video digitally, directly from the chipset. For OSSC we have D/A conversion in Amiga, then A/D conversion (with pixel clock regeneration) in the...
Forum: Hardware mods 01 January 2022, 10:53
Replies: 10
Views: 1,768
Posted By Krashan
My solution was KA71 amplifier...

My solution was KA71 amplifier (https://rastport.com/products/KA71/) however it is discontinued now. On the other hand schematic diagrams may be helpful for building similar device.
Forum: support.Hardware 30 December 2021, 08:08
Replies: 7
Views: 479
Posted By Krashan
It is more about high speed signal integrity and...

It is more about high speed signal integrity and crosstalks. Extender introduces additional inductance and capacitance to the circuit, and bandwidth of signals going trhough the port is in range of...
Forum: Amiga scene 26 December 2021, 10:21
Replies: 51
Views: 5,592
Posted By Krashan
Nice Christmas reading. Thanks.

Nice Christmas reading. Thanks.
Forum: support.Hardware 06 December 2021, 22:26
Replies: 26
Views: 2,858
Posted By Krashan
Paula DACs have current outputs and the first...

Paula DACs have current outputs and the first stage op-amps work in usual current-to-voltage converter configuration.
Forum: support.Hardware 20 November 2021, 16:00
Replies: 12
Views: 1,118
Posted By Krashan
It depends on this keyboard you want to use. A PC...

It depends on this keyboard you want to use. A PC keyboard has its own controller chip, which scans the keyboard matrix, detects keydown and keyup events then sends PC compatible codes via USB or...
Forum: Amiga scene 23 October 2021, 20:35
Replies: 22
Views: 4,218
Posted By Krashan
At least possibility of importing them and...

At least possibility of importing them and sending for selected URL-s should be relatively easy, considering AmiSSL is a port of OpenSSL.
Forum: Amiga scene 23 October 2021, 16:17
Replies: 22
Views: 4,218
Posted By Krashan
Try the Station – gemini://station.martinrue.com....

Try the Station – gemini://station.martinrue.com. It has all the things needed for a forum and is 100% pure Gemini, without add-ons. Both user input and identities via self-signed client...
Forum: Amiga scene 17 October 2021, 17:33
Replies: 22
Views: 4,218
Posted By Krashan
If only AmiGemini supported user text input and...

If only AmiGemini supported user text input and client certificates (Gemini identities), we could have Gemini based Amiga forum :-).
Forum: support.Hardware 15 October 2021, 14:28
Replies: 9
Views: 769
Posted By Krashan
GND alone may be left connected. However leaving...

GND alone may be left connected. However leaving –12 V connected without providing also +12 V, may be harmful for audio op-amps, also damaging output audio capacitors by reverse polarization. Then,...
Forum: Hardware mods 10 October 2021, 19:13
Replies: 4
Views: 1,252
Posted By Krashan
Start with the main (current) circuit. ...

Start with the main (current) circuit.


PSU +5 V output goes straight to Amiga +5 V input.
Amiga ground goes to meter thick red cable.
Meter thick black cable goes to PSU ground.

Then...
Forum: News 29 September 2021, 09:59
Replies: 31
Views: 5,991
Posted By Krashan
No, the only option is to have them 3D printed,...

No, the only option is to have them 3D printed, probably in SLA technology (FDM will look afwul). However I doubt it will look consistent with the rest of keycaps. Custom length stabilizer will be...
Forum: News 17 September 2021, 07:51
Replies: 31
Views: 5,991
Posted By Krashan
Switches are non-standard, as Cherry MX...

Switches are non-standard, as Cherry MX compatibles are too high. So only one Kailh series with blue/brown/red flavors, with characteristics similar to Cherry.
Forum: News 17 September 2021, 07:48
Replies: 31
Views: 5,991
Posted By Krashan
Depends on switches, red ones are comparable to...

Depends on switches, red ones are comparable to original, brown are a bit louder, blue are intentionally noisy. In general – do not expect mech keyboard to be silent.
Forum: News 17 September 2021, 07:46
Replies: 31
Views: 5,991
Posted By Krashan
My keyboard uses DSA keycap profile, same as in...

My keyboard uses DSA keycap profile, same as in your project on GitHub. However I buy blanks and print them locally. Then I can follow original layout and look more strictly. It also allows me to...
Forum: News 16 September 2021, 19:11
Replies: 31
Views: 5,991
Posted By Krashan
Mechanical keyboards from RastPort

I'm the owner of one-man RastPort business. I've seen that my mechanical keyboard KA59 has been mentioned in some other thread. As I don't want to hijack thread of competing product, let's talk about...
Forum: support.Hardware 16 August 2021, 17:03
Replies: 7
Views: 933
Posted By Krashan
According to A600 schematics, bit A23 is on pin...

According to A600 schematics, bit A23 is on pin 53. Pin 63 is _KBRESET, the same as in A1200. A momentary button connecting _KBRESET to ground is, in my opinion, the best solution for a reset button.
Forum: Amiga scene 11 August 2021, 10:33
Replies: 4
Views: 746
Posted By Krashan
His last login on ppa.pl is Aug 9, so it seems he...

His last login on ppa.pl is Aug 9, so it seems he is alive. I've sent him a PM there.
Forum: Hardware mods 01 August 2021, 08:30
Replies: 5
Views: 1,142
Posted By Krashan
44

44
Forum: Hardware mods 31 July 2021, 18:20
Replies: 5
Views: 1,142
Posted By Krashan
Get SD to IDE next time... Saves a lot of...

Get SD to IDE next time... Saves a lot of headaches.
Forum: support.Hardware 16 July 2021, 11:35
Replies: 20
Views: 1,569
Posted By Krashan
This is fundamentally not true. ;) The transistor...

This is fundamentally not true. ;) The transistor on Amiga mobo is a PNP one, it turns on when its base is on low woltage, turns off with 5 V on the base. Your resistor limits the base current, so it...
Forum: support.Hardware 13 July 2021, 11:11
Replies: 20
Views: 1,569
Posted By Krashan
Not really. The problem is a bit different and is...

Not really. The problem is a bit different and is caused by the fact that SD2IDE uses 3.3 V logic levels. Pin 39 of the IDE bus signals drive activity and controls Amiga HDD LED. It is active low...
Forum: support.Hardware 11 July 2021, 09:47
Replies: 30
Views: 3,992
Posted By Krashan
Double scan screenmodes.

Double scan screenmodes.
Forum: support.Hardware 10 July 2021, 19:07
Replies: 25
Views: 2,363
Posted By Krashan
Well, you have mixed "oscilloscope" with...

Well, you have mixed "oscilloscope" with "oscillator", so I've got confused. :) Anyway, failed cristal (which is in fact a complete square wave generator) usually does not work at all, so there is no...
Forum: support.Hardware 10 July 2021, 13:52
Replies: 25
Views: 2,363
Posted By Krashan
I doubt C64 can be overclocked to 28 MHz...

I doubt C64 can be overclocked to 28 MHz...
Forum: support.Hardware 08 July 2021, 10:07
Replies: 25
Views: 2,363
Posted By Krashan
Crystal is connected to Budgie chip. Then it...

Crystal is connected to Budgie chip. Then it produces 14 MHz CPU clock on pin 90, CCK signal (for Alice, Gayle) on pin 36, also 7 MHz clock on pin 92.
Forum: support.Hardware 07 July 2021, 09:46
Replies: 25
Views: 2,363
Posted By Krashan
Weird. For PAL Amigas it should be 28.37516 MHz,...

Weird. For PAL Amigas it should be 28.37516 MHz, more or less square wave with TTL levels. The best place to test are lower pads of R100 and E131R, located to the left of the generator. Signal should...
Forum: support.Hardware 06 July 2021, 21:08
Replies: 25
Views: 2,363
Posted By Krashan
Check 28 MHz clock signal from quartz generator.

Check 28 MHz clock signal from quartz generator.
Forum: support.Hardware 02 July 2021, 20:56
Replies: 3
Views: 531
Posted By Krashan
Try this:...

Try this: https://rastport.com/techblog/removing-aga-display-trashes/
Forum: support.Hardware 20 June 2021, 19:26
Replies: 6
Views: 1,135
Posted By Krashan
I do, but as I am the author of the...

I do, but as I am the author of the aforementioned article, I probably do not count ;-) Anyway it still works great with my 1D4 mainboard.
Forum: Hardware mods 13 June 2021, 12:48
Replies: 61
Views: 15,576
Posted By Krashan
Because AHI has serious design flaws and...

Because AHI has serious design flaws and definitely should be replaced by something better.
Forum: support.Hardware 29 May 2021, 17:58
Replies: 5
Views: 660
Posted By Krashan
1280×1024 is possible as well.

1280×1024 is possible as well.
Forum: support.Hardware 24 May 2021, 17:50
Replies: 3
Views: 440
Posted By Krashan
I would run extensive chip RAM test on this...

I would run extensive chip RAM test on this machine.
Forum: support.Hardware 24 May 2021, 17:46
Replies: 2
Views: 547
Posted By Krashan
Without knowing the pin mapping on such adapter,...

Without knowing the pin mapping on such adapter, it is pure guessing. As it is meant to be used in a programmer, I believe pin mapping will match some popular PAL, CPLD or EEPROM chips.


CIA pin...
Forum: support.Hardware 24 May 2021, 17:33
Replies: 314
Views: 67,930
Posted By Krashan
So true. I've tried to source ubuquitous STM32F1x...

So true. I've tried to source ubuquitous STM32F1x and F0x microcontrollers, and stock is zero at most of usual places with restock dates unknown.
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