Search found 102 matches

by eric
Sat Jan 12, 2019 9:18 am
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

3,3v 5v interfacing

Hi All, I have a question for all the FPGA experts in here...... I was going through my chippies stock and found large SRAM chips ( that i bought for the Atom many years ago. (D431000A NEC SRAM 128kx8) I would like to use them on my FPGA atom now but they are 5v TTL logic minimum 4,5v according to t...
by eric
Sat Sep 26, 2015 12:34 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi guys, I have been doing some vhdl in combi with the LCD display and the T65 core .. I tapped off the registers and can use the LCD display now in 2 different modes .. mode one : all characters write and readable from the atom via 2 Bxxx registers .. or .. mode two : real time debug mode displayin...
by eric
Mon Sep 21, 2015 12:48 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi all, @Kees and Dave --> new Erom with 16 box patched branq + mmc works ... after the 1st tests no errors reported ... it now finds boxes above 7 too right after reset without any manual actions to 1st switch high ..this is the way i like it to behave .. Thanks for the time to make this for me ......
by eric
Sat Sep 19, 2015 8:50 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi All, i was in hardware mode again the past day .. Soldered an LCD 4 lines x 20 chars to the FPGA and some I2C and SPI devices .. (nRF24L01 2,4Ghz transceiver, BMP085 barometric pressure sensor and temp sensor, and a Dallas DS3231 precision clock with battery and also a less accurate temp sensor ....
by eric
Sun Sep 13, 2015 1:11 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Kees,

Allthough my current setup is very ok this way ..
I would not mind using a branq that goes to 16 ..

So yes please ... !! if you can spare the time ...

Grx..

Eric
by eric
Sun Sep 13, 2015 12:11 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Kees, Understood ..! So the important boxes i must keep below 8 .. then all goes right . And if i want to make the upper ones also work do a manual switch and then all will work .. Grx.. Eric PS. The system that i have in front of me now works really well ... i am still impressed about the stabil...
by eric
Sun Sep 13, 2015 11:33 am
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi guys, It seems sometimes my bran is not working fully ... bran is now somewhere in #Exxxx with mmc2 .. it seems to only find boxes below #BFFF=8 .. and then when i switch to the box manually by doing ROM11 and UNLOCK it works OK. After that it sees all the boxes also the ones above #BFFF=7. In my...
by eric
Fri Sep 11, 2015 4:13 pm
Forum: introduce yourself
Topic: Best greetings from the Netherlands
Replies: 16
Views: 2271

Re: Best greetings from the Netherlands

Hi Frank, Welcome ... And greetings from the west side of the netherlands .. I joined this over one year ago .. and do not regret it for a minute .. i hope your experiences will be the same .. the knowledge about the atom in all its today shapes and sizes going around in this forum is extensive ... ...
by eric
Fri Sep 11, 2015 2:41 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Ok then ... So i must see it as a feature in stead of a bug ... as long as you know this behaviour then you can use it as an extra ... and this is an explanation to me why in the original dos they made *exec *run and *filename .. that sort of seemed all to do the same thing ... after 35 years i now ...
by eric
Thu Sep 10, 2015 10:32 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

To MMC BRAN experts .. i remember when compiling bran it needs to know what the box number is of the PCHARME .. in my old system that was #BFFF=2 .. so sort of automatically i put it back there without knowing if that is the right one .. in this MMC2 / branquart combined release .. where must the PC...
by eric
Thu Sep 10, 2015 10:19 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, Again improvements ... I did not get the disk protect error anymore ... I was trying repton .. it was mounted as drive 1 .. If i do *DR.1 and then *. i get a nice catalog .. when i run something it seems my current active drive switches back to drive 0 ... I have to do *L."runme" then run i...
by eric
Thu Sep 10, 2015 5:22 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, I tried it and it seems to work a better .. *ddisks now gives names back here too .. I did get still the disk prot error when mounting "POKER.DSK" into disk 3 then *dr.3 and * avr says : AVR CMD=0x41 when doing *. and get the error .. "DISK PROT ERROR 250" It seems to have improved though ....
by eric
Wed Sep 09, 2015 11:10 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave,

*DDISKS says "SD ERROR 4E"
avr says :
AVR CMD=0x42

AVR CMD=0x20

on a mounted disk *. says "DISK PROT ERROR 250"

avr says :
AVR CMD=0x41

Grx..

Eric
by eric
Wed Sep 09, 2015 10:58 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, This is the output : [2J[0;0Hstdio initialised compiled at 19:58:04 on Sep 9 2015 SerialPort0 AVR CMD=0xfe AVR CMD=0xfe AVR CMD=0xfe AVR CMD=0x80 mmc_initialize send_cmd cmd=0x40, arg=0x00000000 send_cmd ret=0x00 mmc_initialize set CardType to 0x00 AVR CMD=0xf0 a Grx.. Eric
by eric
Wed Sep 09, 2015 10:14 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

i did the excercise again .. starting from the last working backup ... I made sure working with the correct files ... (learned from last time when i went wrong in that) now the system runs again .. i inserted a card formatted FAT16 and put some *.dsk files on it ... if i type SDDOS i get no error an...
by eric
Wed Sep 09, 2015 9:11 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Thanks Kees,

got them ..

Hmm .. after compile with the new 3 files .. it does not start anymore .. no screen .. just a click in the speakers ...

I must find out what went wrong ..
Will come back on it ..
(@Dave ... use the normal or the debug prog_mem_init ?)

Grx...
Eric
by eric
Wed Sep 09, 2015 8:54 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave,

downloaded it and it is now compiling ... my turnover time is about 11 minutes between click on generate bitstream and seeing it running ..

Where can i get some of these *.dsk 100kb files to test it ?
I understood my sddos 2 cards cannot be read in this setup ..

Grx..

Eric
by eric
Wed Sep 09, 2015 5:21 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, I will wait for your findings with patience and interest .. I am a happy man with mmc2 ... but i did like sddos too .. if i can do both .. i have the maximum ... I was thinking of implementing the sddos E rom switchable with mmc .. and in vhdl make the sdcard wires also switchable between t...
by eric
Wed Sep 09, 2015 4:18 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

I was using SDDOS V2.3E with these cards ...
that was part of the old LX9 project i used ..

Grx...

Eric
by eric
Wed Sep 09, 2015 4:05 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Tried it .. still NO DISK at *. and when i do a *DIN 0,1 or *DCAT 0,10 i get SD ERROR 4D I took the file from github .. converted it so it holds the header that makes it loadable from mmc .. loaded it into a free Axxx slot ... when i type SDDOS .. it comes back to the prompt with no errors .. I used...
by eric
Wed Sep 09, 2015 2:59 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Kees, I tried it .. but got SD card error 4 and sometimes hangers .. What is the correct Axxx rom to work with the FPGA mmc2 hardware ? is it in the softrware archive ? I found 2 there .. sdrom 2 and sdrom 3... I also found a rom in my collection .. i could not find in the archives .. i added it ...
by eric
Tue Sep 08, 2015 8:01 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Kees, Helpful resource .. ! .. the box manuals come in handy ... i did forget one or two command over the years ... -;) .... So i can load an SDDOS Axxx box ... and still use my old sddos formatted cards ? and then switch to mmc2 and save it there ? or is there no quick way to switch between the ...
by eric
Tue Sep 08, 2015 5:31 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, I am glad too ... my experience in xilinx ise vhdl is still limited but growing .. I learned a lot the past 6 months .. i now dare to change things and add things and see where it will get me.. your work on the atom in FPGA (and the others that have been contributing too of course) was one ...
by eric
Tue Sep 08, 2015 4:24 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, I have it running too now .. i dropped the files in again .. and found also the wrong folder (other version next to it ) where i did the copy to after you updated the files on github .. I recompiled .. and all seems OK now ... now time to dive into the commands of atommmc .. i did not have ...
by eric
Mon Sep 07, 2015 11:13 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, after executing the test program i get PASS 0 0 3 0 3 PASS 1 3 3 0 3 So it seems the first 2 bits are high most of the time .. bit 3 never .. I have the option to cut the rx tx loose of the godil module and use these lines for the arduino uart .. on the saturn board is also an FTDI dual por...
by eric
Sun Sep 06, 2015 9:55 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, Compiled it .. and flashed it .. I now get ACORN ATOM [] without the > and [] is the cursor block .. no mmc text .. and it hangs there .. with ctrl break normal atom prompt and it seems that bran works (unlock gives no error, rom command works). I get a 0 when peeking at #B400 .. so it addr...
by eric
Sun Sep 06, 2015 7:57 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Ok ..

Time for me to get ise going for the next run ..

thanks for the support and suggestions i could not get this working without .. !

Here are some pics i made of the video out extra atom video out screen ..

Grx...

Eric
by eric
Sun Sep 06, 2015 7:30 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, I got the files .... thanks .. ! implementing them now .. I use the romset that you have in your papilio duo project for this .. correct ? 850 mS .. hmm .. getting close to a second .. it should be going further within that time .. Maybe something else is wrong ... I can tap it off to an ex...
by eric
Sun Sep 06, 2015 6:51 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, The other thing I could do is just patch the current version of the firmware into the AVR RAM file as initial data. Would you like me to do this? Yes Please ! ... that would be very helpful .. Allthough it is very nice to have the sources ... if it would just only be for insight in how it i...
by eric
Sun Sep 06, 2015 5:46 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 52521

Re: ATOM FPGA

Hi Dave, Take a look in the AtomFPGA/atommc2fw directory at the Makefile.duo. This compiles the firmware, then uses the Xilinx data2mem command to patch it into the .bit file. The process is a bit complicated, but it means you can iterate on the firmware without needing to recompile the FPGA. I use ...