English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 726
Search took 0.06 seconds.
Search: Posts Made By: Stedy
Forum: support.Hardware 18 May 2022, 21:57
Replies: 9
Views: 517
Posted By Stedy
Hi, the original, mechanical floppy drive will...

Hi, the original, mechanical floppy drive will only respond as DF0: due to the MTR0 signal (PIN 16 of floppy cable) only working for DF0:. You've connected to the right places, just the mod won't...
Forum: Hardware mods 12 May 2022, 00:41
Replies: 517
Views: 106,025
Posted By Stedy
Complexity and cost. Although there appears...

Complexity and cost.

Although there appears to be space around the custom chips, it is not available to squish more parts in as that is where the tracks are routed.

To fit more in, you would...
Forum: support.Hardware 27 March 2022, 17:11
Replies: 14
Views: 1,041
Posted By Stedy
Hi, Inside the 23/25 way backshell for the...

Hi,

Inside the 23/25 way backshell for the Amiga, are there any resistors?
On pins 10, 22 & 23 of the Amiga end there should be some resistors, to set the correct sync level and RGB mode. They...
Forum: Hardware mods 06 March 2022, 19:21
Replies: 5
Views: 1,113
Posted By Stedy
Hi, https://www.snapeda.com/parts/add/ will...

Hi,

https://www.snapeda.com/parts/add/ will convert Eagle libraries.
The A600 is already in Kicad, https://github.com/istedman/A600Reborn
Forum: support.Hardware 13 February 2022, 14:40
Replies: 15
Views: 1,069
Posted By Stedy
Hi, Retropassion...

Hi,

Retropassion (https://www.retropassion.co.uk/) will be stocking these adaptors. They should be on the website in a week.

I used the PIC Microcontroller and Tag-Connect adaptor as they are...
Forum: support.Hardware 11 February 2022, 17:35
Replies: 15
Views: 1,069
Posted By Stedy
Hi, I got your message. The Github archive...

Hi,

I got your message. The Github archive include the Gerber images I used to get the PCBs fabricated, look for Multipurpose-ATX-gerbers.zip (Original/Big box) and...
Forum: Hardware mods 07 February 2022, 23:08
Replies: 517
Views: 106,025
Posted By Stedy
Hi, I have a working bandpass filter for the...

Hi,

I have a working bandpass filter for the CXA1145 now, just seeing if I can shrink it and make it less complex, to get a smaller solution.
The Delay line will follow shortly. I had to build...
Forum: Hardware mods 06 January 2022, 16:50
Replies: 517
Views: 106,025
Posted By Stedy
It is. It can use the original CXA1145 or...

It is.

It can use the original CXA1145 or the newer CXA2075 encoder which does not need the bandpass filter or delay line.

I am still playing with the bandpass filter/delay line replacement....
Forum: support.Hardware 06 January 2022, 16:44
Replies: 9
Views: 763
Posted By Stedy
Hi, You could cut pin 14 and see if it...

Hi,

You could cut pin 14 and see if it works. Perhaps the less drastic fix is to cut pin 14 on the floppy drive cable where it plugs into the Amiga. Most drives do not use the INUSE signals, I...
Forum: support.Hardware 05 January 2022, 16:34
Replies: 9
Views: 763
Posted By Stedy
Hi, I can see the problem, not 100% on the...

Hi,

I can see the problem, not 100% on the fix.

The A1500, A2000 and A3000 have the INUSE1 signal driven on pin 14 of the 34 way FDD connector. This is uncommon and they are the only Amiga...
Forum: Hardware mods 31 December 2021, 14:24
Replies: 517
Views: 106,025
Posted By Stedy
Hi, I cleaned out an older Gerbers directory...

Hi,

I cleaned out an older Gerbers directory on Github, if you go straight to https://github.com/istedman/A600Reborn/tree/master/A600_Svideo_Working, you will have the files you need.

I'll play...
Forum: support.Hardware 27 December 2021, 00:18
Replies: 26
Views: 2,832
Posted By Stedy
Hi, My apologies, I've treated this circuit...

Hi,

My apologies, I've treated this circuit like a typical precision op-amp circuit when I did not need to. To boost the output change R325 and R335 from 390R to either 470R or 510R. This will get...
Forum: support.Hardware 21 December 2021, 16:28
Replies: 26
Views: 2,832
Posted By Stedy
I wouldn't fiddle with R335/R325 if I were you. A...

I wouldn't fiddle with R335/R325 if I were you. A typical measurement accuracy of an oscilloscope is +/- 2.5% +0.2 division, your readings are within the margin of error. If you have a true RMS 5.5...
Forum: Hardware mods 20 December 2021, 11:40
Replies: 517
Views: 106,025
Posted By Stedy
I have a V1 board, it does not boot. I know what...

I have a V1 board, it does not boot. I know what is not working but not why? :confused

Mick has a V1.1 board, the one that is on Github and it works.

There is also the Junebug A600 clone, I saw...
Forum: support.Hardware 08 December 2021, 16:42
Replies: 26
Views: 2,832
Posted By Stedy
Me again. 74022 This should explain the...

Me again.

74022
This should explain the differences in audio circuits. To adjust the signal level, you need to change the parts highlighted. If it is built with the values shown in the schematics...
Forum: support.Hardware 07 December 2021, 00:17
Replies: 26
Views: 2,832
Posted By Stedy
:banghead I should have spotted the...

:banghead I should have spotted the Transimpedance amplifier!

I modelled it as an 8mA current source and the simulation has a nice sinewave output with 360 ohms for R331/R321.
Change to 1.5K and...
Forum: support.Hardware 06 December 2021, 22:18
Replies: 26
Views: 2,832
Posted By Stedy
Hi, This topic intrigued me and I had a bit...

Hi,

This topic intrigued me and I had a bit of a slow day.
The schematics on Amigawiki.org do not match the original printed versions from Commodore, I should know, I have paper copies of them.
...
Forum: support.Hardware 05 December 2021, 00:40
Replies: 26
Views: 2,832
Posted By Stedy
The attached file is a measured output from a rev...

The attached file is a measured output from a rev 2 A600.
73995
The peak to peak is 1.69V, the RMS is 0.596V.
Doing the sums, it equates to -2.25dB below Pro reference level.

The second...
Forum: support.Hardware 03 September 2021, 13:44
Replies: 18
Views: 2,117
Posted By Stedy
Try some aluminium foil/bacofoil inside the case....

Try some aluminium foil/bacofoil inside the case. Earth the foil to the chassis and it should reduce the magnetic field enough.
I did some EMC testing, at an accredited site earlier this year, for a...
Forum: support.Hardware 18 July 2021, 17:51
Replies: 4
Views: 679
Posted By Stedy
It would be swappable via a physical switch. I...

It would be swappable via a physical switch. I did look at a keyboard option on reset but with the myriad configurations, discounted it. You can get micro miniature toggle switches.

Likely to just...
Forum: support.Hardware 13 July 2021, 21:58
Replies: 4
Views: 679
Posted By Stedy
Hi, The adaptor can support HD mode but I...

Hi,

The adaptor can support HD mode but I won't release the design with that support. As any HD mode requires a floppy drive to be modified and there are a myriad right and wrong ways, the support...
Forum: support.Hardware 13 July 2021, 00:17
Replies: 4
Views: 679
Posted By Stedy
Interested in a plug 'n' play Gotek/Floppy switcher?

Hi,

I have something in development, that may be of interest. I've adapted one of my old PC to Amiga floppy drive adaptors to allow you to easily swap between a real floppy drive (Amiga or PC) and...
Forum: Hardware mods 08 June 2021, 00:33
Replies: 61
Views: 15,548
Posted By Stedy
Top Man Mick, you asked the hard question. ...

Top Man Mick, you asked the hard question.

Consider the A600, you'd need to replicate Agnus, Denise, Gayle, Paula and the VIAs/CIAs. A ballpark number for the hours per device, for a proof of...
Forum: Hardware mods 07 June 2021, 19:24
Replies: 517
Views: 106,025
Posted By Stedy
Hi, Sorry for lack of updates, new job and a...

Hi,

Sorry for lack of updates, new job and a few other changes, anyway. The bandpass filter did not work, I was 3dB down (1/2 power) at the pass band. Have not had the time to go back to it, to...
Forum: support.Hardware 25 May 2021, 00:33
Replies: 9
Views: 1,257
Posted By Stedy
Hi, It's likely caused bye either the Amiga...

Hi,

It's likely caused bye either the Amiga 28.37516MHz oscillator drifting, as mentioned by mark_k or the OSSC master 27 MHz oscillator drifting.
Neither the Amiga or OSSC appear to have tight...
Forum: support.Hardware 21 May 2021, 22:49
Replies: 15
Views: 1,395
Posted By Stedy
Hi, Looking at the PCB from Github,...

Hi,

Looking at the PCB from Github, https://github.com/solarmon/RGBtoHDMI/tree/main/RGBtoHDMI%20Amiga%20Denise%20-%20solarmon%20-%20Rev%202%20-%20SOIC

I can see why you have issues.
1) You...
Forum: support.Hardware 16 March 2021, 01:05
Replies: 17
Views: 2,056
Posted By Stedy
Hi, Assuming I've byte reversed correctly,...

Hi,

Assuming I've byte reversed correctly, the status registers indicated that the graphics card had a parity error on a transfer and the processor detected it and set a master abort.

Looking...
Forum: Hardware mods 27 February 2021, 16:09
Replies: 517
Views: 106,025
Posted By Stedy
I removed the original design from Github. The...

I removed the original design from Github. The design on Github is 100% working.

The confusion about the serial port came from myself. On my board, I have no working serial port as the CPU cannot...
Forum: Hardware mods 24 February 2021, 00:41
Replies: 517
Views: 106,025
Posted By Stedy
I plan to try the BPF at the weekend. Not sure if...

I plan to try the BPF at the weekend. Not sure if I could make them retrofit existing PCBs, will see how small I can make it.

The original board is not working due to U26/U27 not passing the data...
Forum: Hardware mods 23 February 2021, 00:39
Replies: 517
Views: 106,025
Posted By Stedy
Mick, Send me the files for the board you...

Mick,

Send me the files for the board you have working, I'll upload them to github and I'll start the support Wiki, I have a few entries to add. From here, other users can take the designs, create...
Forum: Hardware mods 22 February 2021, 23:14
Replies: 517
Views: 106,025
Posted By Stedy
Hi, C7, C8, C28 were all 10nF. Have not had...

Hi,

C7, C8, C28 were all 10nF. Have not had a chance to trial the delay line or bandpass filter design with real hardware.

Mick, you've done a 1:1 board, that's one of the boards I've been...
Forum: Hardware mods 19 February 2021, 00:20
Replies: 517
Views: 106,025
Posted By Stedy
Thanks, that came in handy. I designed a Bandpass...

Thanks, that came in handy. I designed a Bandpass filter today, something to do in my lunch break. I ran it through LTSpice, it appeared to work Ok. The delay line was also designed but the simulator...
Forum: Hardware mods 16 February 2021, 23:46
Replies: 517
Views: 106,025
Posted By Stedy
Hi, Mick, I'll check those capacitors in the...

Hi,

Mick, I'll check those capacitors in the next day or two and confirm the results. I could design a delay line for the video circuit quite easily, for the bandpass filter, I need to know how...
Forum: Hardware mods 07 February 2021, 21:31
Replies: 517
Views: 106,025
Posted By Stedy
Hi, I made some more progress with the board...

Hi,

I made some more progress with the board this weekend, it now reads from the Kickstart ROM! I ended u doing a continuity check of every pin of the CPU to a point somewhere on the PCB. When I...
Forum: support.Hardware 05 February 2021, 12:57
Replies: 17
Views: 2,056
Posted By Stedy
Hi, From what you describe, the PowerPC...

Hi,

From what you describe, the PowerPC processor has had a critical fault, on some PPC devices, this is a machine check exception. Have seen this in my day job, the CPU core would hand up but...
Forum: support.Hardware 03 February 2021, 22:54
Replies: 17
Views: 2,056
Posted By Stedy
Hi, Interested in the PCI Command and Status...

Hi,

Interested in the PCI Command and Status registers, latency timer, cache line, interrupt line/pin, MIN grant, MAX LAT and the base address registers.
It's also useful to know what memory...
Forum: support.Hardware 03 February 2021, 13:13
Replies: 17
Views: 2,056
Posted By Stedy
Hi, I'll try my best. Do you have something...

Hi,

I'll try my best. Do you have something equivalent to "lspci" on the Amiga?
This is useful as itprettifies and prints the PCI config registers of every device and is a good starting point.
Forum: Hardware mods 30 January 2021, 16:03
Replies: 517
Views: 106,025
Posted By Stedy
@Mick, Still no luck with my board. One more...

@Mick,

Still no luck with my board. One more trick to try to see if the processor will boot, then I'll check all connections from CPU to ROM in case I damaged something by having the ROM...
Forum: Hardware mods 13 January 2021, 00:14
Replies: 517
Views: 106,025
Posted By Stedy
Hi Mick, Let's start with the soldering...

Hi Mick,

Let's start with the soldering first.
Sometimes, adding fresh solder makes removal easier as the flux from the fresh solder helps to melt the joint, which has potentially oxidised. I...
Forum: Hardware mods 12 January 2021, 00:14
Replies: 517
Views: 106,025
Posted By Stedy
Damn, you've got further than me! Kickstart 3.1...

Damn, you've got further than me!
Kickstart 3.1 has up to 20 second delay for floppy drive before the kickstart screen shows?
The A600 does not have a DAC, that's the A1200. It uses a resistor...
Showing results 1 to 40 of 726

 
Forum Jump

All times are GMT +2. The time now is 04:12.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Page generated in 0.11605 seconds with 10 queries