Forum: support.Hardware
18 May 2022, 21:57
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Replies: 9
Views: 685
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...
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Forum: Hardware mods
12 May 2022, 00:41
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Replies: 524
Views: 110,092
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...
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Forum: support.Hardware
27 March 2022, 17:11
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Replies: 14
Views: 1,117
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...
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Forum: Hardware mods
06 March 2022, 19:21
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Replies: 5
Views: 1,216
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Forum: support.Hardware
13 February 2022, 14:40
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Replies: 15
Views: 1,152
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...
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Forum: support.Hardware
11 February 2022, 17:35
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Replies: 15
Views: 1,152
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Forum: Hardware mods
07 February 2022, 23:08
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Replies: 524
Views: 110,092
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...
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Forum: Hardware mods
06 January 2022, 16:50
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Replies: 524
Views: 110,092
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....
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Forum: support.Hardware
06 January 2022, 16:44
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Replies: 9
Views: 796
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...
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Forum: support.Hardware
05 January 2022, 16:34
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Replies: 9
Views: 796
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...
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Forum: Hardware mods
31 December 2021, 14:24
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Replies: 524
Views: 110,092
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...
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Forum: support.Hardware
27 December 2021, 00:18
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Replies: 26
Views: 2,969
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...
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Forum: support.Hardware
21 December 2021, 16:28
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Replies: 26
Views: 2,969
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Forum: Hardware mods
20 December 2021, 11:40
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Replies: 524
Views: 110,092
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Forum: support.Hardware
08 December 2021, 16:42
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Replies: 26
Views: 2,969
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...
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Forum: support.Hardware
07 December 2021, 00:17
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Replies: 26
Views: 2,969
: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...
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Forum: support.Hardware
06 December 2021, 22:18
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Replies: 26
Views: 2,969
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.
...
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Forum: support.Hardware
05 December 2021, 00:40
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Replies: 26
Views: 2,969
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Forum: support.Hardware
03 September 2021, 13:44
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Replies: 18
Views: 2,358
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Forum: support.Hardware
18 July 2021, 17:51
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Replies: 4
Views: 693
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...
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Forum: support.Hardware
13 July 2021, 21:58
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Replies: 4
Views: 693
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...
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Forum: support.Hardware
13 July 2021, 00:17
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Replies: 4
Views: 693
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Forum: Hardware mods
08 June 2021, 00:33
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Replies: 61
Views: 15,838
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...
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Forum: Hardware mods
07 June 2021, 19:24
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Replies: 524
Views: 110,092
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...
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Forum: support.Hardware
25 May 2021, 00:33
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Replies: 9
Views: 1,268
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...
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Forum: support.Hardware
21 May 2021, 22:49
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Replies: 15
Views: 1,431
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...
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Forum: support.Hardware
16 March 2021, 01:05
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Replies: 17
Views: 2,065
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...
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Forum: Hardware mods
27 February 2021, 16:09
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Replies: 524
Views: 110,092
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...
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Forum: Hardware mods
24 February 2021, 00:41
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Replies: 524
Views: 110,092
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Forum: Hardware mods
23 February 2021, 00:39
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Replies: 524
Views: 110,092
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...
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Forum: Hardware mods
22 February 2021, 23:14
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Replies: 524
Views: 110,092
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...
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Forum: Hardware mods
19 February 2021, 00:20
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Replies: 524
Views: 110,092
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Forum: Hardware mods
16 February 2021, 23:46
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Replies: 524
Views: 110,092
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...
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Forum: Hardware mods
07 February 2021, 21:31
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Replies: 524
Views: 110,092
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...
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Forum: support.Hardware
05 February 2021, 12:57
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Replies: 17
Views: 2,065
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...
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Forum: support.Hardware
03 February 2021, 22:54
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Replies: 17
Views: 2,065
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...
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Forum: support.Hardware
03 February 2021, 13:13
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Replies: 17
Views: 2,065
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.
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Forum: Hardware mods
30 January 2021, 16:03
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Replies: 524
Views: 110,092
@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...
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Forum: Hardware mods
13 January 2021, 00:14
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Replies: 524
Views: 110,092
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...
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Forum: Hardware mods
12 January 2021, 00:14
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Replies: 524
Views: 110,092
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