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Search: Posts Made By: PR77
Forum: Hardware mods 02 April 2021, 11:07
Replies: 24
Views: 3,362
Posted By PR77
I've been thinking about how to go about doing a...

I've been thinking about how to go about doing a production run actually. Over at a1k there has been a good response to the design - this makes me happy. I've been testing in the background with...
Forum: support.Hardware 30 March 2021, 21:43
Replies: 25
Views: 3,260
Posted By PR77
I've seen a few of these boards pop up on eBay...

I've seen a few of these boards pop up on eBay and some classifieds here in Germany. I was pleasantly surprised to be honest. Interested to know if anyone here has made one and how they are finding...
Forum: Hardware mods 21 March 2021, 10:11
Replies: 24
Views: 3,362
Posted By PR77
I’ve been doing more testing with WHDload and so...

I’ve been doing more testing with WHDload and so far the only issue I’ve found are some glitches with some demos. I will try these without the accelerator and memory expansion when I get a chance. I...
Forum: Hardware mods 06 March 2021, 16:37
Replies: 258
Views: 39,233
Posted By PR77
I've not had a chance to catch up with all what...

I've not had a chance to catch up with all what is going on - is the TF1260 now available? Under specific terms and conditions?
Forum: Hardware mods 05 February 2021, 22:45
Replies: 24
Views: 3,362
Posted By PR77
If you have some suggestions I would love it give...

If you have some suggestions I would love it give it a go.
Forum: Hardware mods 05 February 2021, 20:57
Replies: 24
Views: 3,362
Posted By PR77
I spent a lot of time thinking about this and...

I spent a lot of time thinking about this and concluded it would not be a concern. In all my tests I have not come into any issues. What do you think the concern is here?

I found a lot of other...
Forum: Hardware mods 22 January 2021, 12:09
Replies: 24
Views: 3,362
Posted By PR77
I can imagine... :)

I can imagine... :)
Forum: Hardware mods 21 January 2021, 20:11
Replies: 24
Views: 3,362
Posted By PR77
Nice job on the upside down PLCC68 footprint......

Nice job on the upside down PLCC68 footprint... :bowdown
Forum: Hardware mods 21 January 2021, 17:35
Replies: 24
Views: 3,362
Posted By PR77
Programmable Crystal sounds interesting. Do you...

Programmable Crystal sounds interesting. Do you have any references? As for SlowRAM only, that cant be done without a PCB change as the XTAL clock directly to the CPLD and CPU. It would be possible...
Forum: Hardware mods 17 January 2021, 20:09
Replies: 24
Views: 3,362
Posted By PR77
Yes. S = Static, EC = Embedded version. Later...

Yes. S = Static, EC = Embedded version. Later model 68000 and manufactured with more modern processes. Even though the parts are rated for 20 MHz, they run upwards of 50 Mhz.
Forum: Hardware mods 17 January 2021, 10:26
Replies: 24
Views: 3,362
Posted By PR77
New Amiga 600 Accelerator

Hi All,

Check out my new Open Source Amiga 600 Accelerator here;

https://github.com/PR77/A600_ACCEL_RAM


MC68SEC000 @40MHz
1.5MB FastRAM
0.5MB MapROM
Forum: Hardware mods 22 November 2020, 13:27
Replies: 4
Views: 1,709
Posted By PR77
This is a very interesting idea ... Do you have...

This is a very interesting idea ... Do you have some benchmarks for comparison? With only Chip RAM present?

For newer accelerators which generate an E Clock (mine inclusive) based on the original...
Forum: Hardware mods 09 November 2020, 08:22
Replies: 466
Views: 62,960
Posted By PR77
I'm really impressed with how the design has come...

I'm really impressed with how the design has come along ... well done ... Just a couple of points I noticed and wanted to ask if they have been considered;

1. Thermal reliefs around TH pads -...
Forum: Hardware mods 09 July 2020, 11:17
Replies: 2
Views: 947
Posted By PR77
Here is another option. I've created Flash Based...

Here is another option. I've created Flash Based KS switcher where you can download an image with a small tool. Not as "comfortable" as others, but it works for my applications;
...
Forum: Hardware mods 24 June 2020, 21:31
Replies: 10
Views: 2,351
Posted By PR77
Nice one!

Nice one!
Forum: Hardware mods 14 February 2020, 16:31
Replies: 500
Views: 82,079
Posted By PR77
I have to agree. Please consider open sourcing. I...

I have to agree. Please consider open sourcing. I know this has been raised many times so I don't want to get into that again. I would donate to some $$$ just to have this open to the masses. :)

...
Forum: Hardware mods 08 February 2020, 19:12
Replies: 500
Views: 82,079
Posted By PR77
Great project! Well done. By default is TG68...

Great project! Well done. By default is TG68 implementing the EC020? Are you planning to open source?

Ps., I found this on EAB;

http://eab.abime.net/showthread.php?t=47989
Forum: support.Hardware 07 January 2020, 11:49
Replies: 25
Views: 2,279
Posted By PR77
Agreed. I also had an issue with the Photo...

Agreed. I also had an issue with the Photo resistors / interrupters.
Forum: Hardware mods 05 January 2020, 09:53
Replies: 100
Views: 22,221
Posted By PR77
For debugging purposes, simply feed CDAC and 7mhz...

For debugging purposes, simply feed CDAC and 7mhz into U4c and disconnect U4d output into U4c. This will then generated a synchronised 14mhz clock with solid edges. I think the original circuit had...
Forum: support.Hardware 03 January 2020, 16:38
Replies: 267
Views: 55,394
Posted By PR77
Great work guys... I really like the A600...

Great work guys... I really like the A600 option... Nice PCB layout too, from what I could see in the pictures... :)
Forum: Hardware mods 29 December 2019, 08:15
Replies: 258
Views: 39,233
Posted By PR77
Firmware = verilog in this case? Does it use a...

Firmware = verilog in this case? Does it use a counter for the entire ROM address space (which would use a lot of CPLD resource) or is there some other magic?
Forum: support.Hardware 13 August 2019, 11:44
Replies: 88
Views: 15,815
Posted By PR77
Thanks. I never really planned for the...

Thanks. I never really planned for the accelerator to be used with an RF Shield because I use it with a relocator (I have designed one with Flash ROMS...
Forum: Hardware pics 07 August 2019, 20:52
Replies: 14
Views: 6,922
Posted By PR77
Unfortunately I don't own an Amiga 1000 (was the...

Unfortunately I don't own an Amiga 1000 (was the first Amiga I ever saw and set me on the path), but I'm pretty sure my Flash Kickstart Relocator project might be interesting for those wanting the...
Forum: Coders. C/C++ 30 May 2019, 20:29
Replies: 7
Views: 1,527
Posted By PR77
Hey thanks... Just registered...

Hey thanks... Just registered...
Forum: Coders. C/C++ 29 May 2019, 12:26
Replies: 7
Views: 1,527
Posted By PR77
Thanks, it now works!

Thanks, it now works!
Forum: Coders. C/C++ 25 May 2019, 23:29
Replies: 12
Views: 2,568
Posted By PR77
Anyway know why VBCC throughs warning 214? Better...

Anyway know why VBCC throughs warning 214? Better still, what is wrong with the following printf(…)


printf("cd_BoardAddr = 0x%X\n", myCD->cd_BoardAddr);
Forum: Coders. C/C++ 25 May 2019, 23:20
Replies: 7
Views: 1,527
Posted By PR77
VBCC and pointer dereferencing

I'm trying to finalise the code for my 68000 CPU Relocator with FLASH kickstart support (https://github.com/PR77/68000_Relocator_FLASH_Kickstart) however I am stuck on some pointer arithmetic. Here...
Forum: support.Hardware 20 May 2019, 22:21
Replies: 25
Views: 3,260
Posted By PR77
I've made several updates and now have a final...

I've made several updates and now have a final PCB. Check out the GitHub for those interested.
Forum: Hardware mods 15 May 2019, 15:38
Replies: 6
Views: 1,394
Posted By PR77
Nice one!

Nice one!
Forum: support.Hardware 18 April 2019, 14:22
Replies: 9
Views: 1,552
Posted By PR77
I'm really excited to see more on the A314. Keep...

I'm really excited to see more on the A314. Keep up the great work.
Forum: support.Hardware 20 March 2019, 21:52
Replies: 10
Views: 737
Posted By PR77
I would then try DiagROM and run a memory test to...

I would then try DiagROM and run a memory test to exercise U34 and U35 for the ChipRAM ADDR and CTRL paths. If the issue is 100% occurring at the same point and the same part of the image is...
Forum: support.Hardware 20 March 2019, 21:36
Replies: 10
Views: 737
Posted By PR77
R3/5 have A17 pinned differently so that explains...

R3/5 have A17 pinned differently so that explains the pull ups (or pull downs- depending on where in the memory space you are addressing. R6 and up have the ROM socket routed for larger ROMs sizes...
Forum: support.Hardware 20 March 2019, 14:01
Replies: 10
Views: 737
Posted By PR77
Few things to check; 1. What timing is the...

Few things to check;

1. What timing is the Flash Chip? As you mentioned timing might be an issue but the original ROM was around 120ns (I think) and given other ROM images are OK I suspect this is...
Forum: support.Hardware 16 March 2019, 20:50
Replies: 88
Views: 15,815
Posted By PR77
Thanks for the offer... The design is in Github...

Thanks for the offer... The design is in Github (PR77) so feel free to grab a copy and post a design, I'm very interested to see how others bring their flair to the design.

While you're at it,...
Forum: Hardware mods 25 February 2019, 14:08
Replies: 139
Views: 25,157
Posted By PR77
Fancy helping me with a layout? I don't get so...

Fancy helping me with a layout? I don't get so much pleasure with laying out PCBs.
Forum: Hardware mods 19 February 2019, 10:19
Replies: 139
Views: 25,157
Posted By PR77
Wow! Anyone know if the PCB will fit in the...

Wow! Anyone know if the PCB will fit in the Checkmate 1500 case? I am waiting on 2 of those bad boys!
Forum: Hardware mods 03 February 2019, 13:15
Replies: 202
Views: 61,601
Posted By PR77
Check out this; ...

Check out this;

https://github.com/PR77/68000_Relocator_FLASH_Kickstart/blob/master/README.md
Forum: support.Hardware 10 January 2019, 21:47
Replies: 25
Views: 3,260
Posted By PR77
After a few months I finally got some time to...

After a few months I finally got some time to revisit this little project. Check out the latest here;

https://github.com/PR77/68000_Relocator_FLASH_Kickstart
Forum: Coders. Asm / Hardware 31 December 2018, 14:00
Replies: 18
Views: 2,760
Posted By PR77
I've put together a based C program (vbcc) to...

I've put together a based C program (vbcc) to exercise an IO Port on an accelerator card I've developed. Here is the code;
...
Forum: Hardware mods 30 November 2018, 21:19
Replies: 182
Views: 32,288
Posted By PR77
Those motherboard chip RAM adapters look...

Those motherboard chip RAM adapters look interesting...
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