Problem assembling SDCARD version

fisu · Post by **fisu** » Tue Feb 17, 2009 11:29 pm

Hi,

I started assembling the board but I noticed that the PDF and JPG are different just above the 18F4525. For example, there is some component below U7 and right from C16 but placement layout does not show anything there. Please help

U10:
SD Memory Card Connector (With write-protect switch and card-detect function)
(farnell 1143953)

I bought that one but it actually does not have write-protect and card-detect so do I have to buy some other part or can I modify the board / software to make it work?

Post by **Jeff** » Wed Feb 18, 2009 12:20 am

fisu wrote:Hi,

I started assembling the board but I noticed that the PDF and JPG are different just above the 18F4525. For example, there is some component below U7 and right from C16 but placement layout does not show anything there. Please help

mhh i don't see the difference . can you show me on the jpg ?

fisu wrote: U10:
SD Memory Card Connector (With write-protect switch and card-detect function)
(farnell 1143953)

I bought that one but it actually does not have write-protect and card-detect so do I have to buy some other part or can I modify the board / software to make it work?

No, i finally don't use these signals, this will work without write-protect and card-detect switch.

fisu · Post by **fisu** » Wed Feb 18, 2009 11:40 am

Yes, I'm missing some holes but these 2 look like extra. Sorry for the large image...

fisu · Post by **fisu** » Wed Feb 18, 2009 11:42 am

and the example image

fisu · Post by **fisu** » Wed Feb 18, 2009 2:32 pm

I guess it is just a jump wire. Am I correct?

Post by **Jeff** » Thu Feb 19, 2009 12:10 am

fisu wrote:I guess it is just a jump wire. Am I correct?

yes that's it !

Pryanick · Post by **Pryanick** » Wed Mar 25, 2009 5:07 pm

fisu, I desided to build Emulator by myself too.
What PCB version You use?
And what schematic and firmware version You use?
I'm interesting becouse I found some differeces in schematic and PCB. I'm trying to understand - what schematic and PCB version are fit each other.
You can answer directly to my email:

Pryanick · Post by **Pryanick** » Tue Mar 31, 2009 7:19 am

TnX Jeff

shprivat · Post by **shprivat** » Wed Aug 19, 2009 10:27 am

Jeff,

Are you using this compiler for creating the firmware?

http://www.microchip.com/stellent/idcpl ... e=en010014

If so, the compiler seems to be quite expensive (~ 500 USD). Is the evaluation version also ok (runs for 60 days)? Or is there any other alternative? I would like to do some changes to the PIC firmware (e.g. automatically select the first HFE file without any user interaction when the system starts or a new SD card has been detected).

Thank you again for this great project !

Sven

shprivat · Post by **shprivat** » Wed Aug 19, 2009 1:11 pm

Thank you for your answer.

I want to use the your SD card version for a very old CP/M based computer. For this purpose I want to mount the first HFE file automatically (which contains the boot floppy).

I have now installed the trial version and was able to compile your project sucessfully. I do not have any hardware built until now, but I will be using Pyranick's PCB because it has the floppy power connector.

Thanks,
Sven

Post by **Jeff** » Wed Aug 19, 2009 1:59 pm

shprivat wrote:
Thank you for your answer.

I want to use the your SD card version for a very old CP/M based computer. For this purpose I want to mount the first HFE file automatically (which contains the boot floppy).

I have now installed the trial version and was able to compile your project sucessfully. I do not have any hardware built until now, but I will be using Pyranick's PCB because it has the floppy power connector.

Thanks,
Sven

ok but what is the context of your project ? professionnal or hobbyist? what is this cpm system ?

shprivat · Post by **shprivat** » Wed Aug 19, 2009 2:44 pm

Jeff wrote:
shprivat wrote:
Thank you for your answer.

I want to use the your SD card version for a very old CP/M based computer. For this purpose I want to mount the first HFE file automatically (which contains the boot floppy).

I have now installed the trial version and was able to compile your project sucessfully. I do not have any hardware built until now, but I will be using Pyranick's PCB because it has the floppy power connector.

Thanks,
Sven
ok but what is the context of your project ? professionnal or hobbyist? what is this cpm system ?

Purely hobbyist. The CP/M system is a Z80 based system I assembled about 20 years ago. I wrote the BIOS and produced most of the PCBs. For the BIOS code I also wrote the floppy disc routines, the system contains an INTEL 8272 floppy disc controller chip which (as far as I remember) was quite tricky to program.

Post by **Jeff** » Wed Aug 19, 2009 3:55 pm

shprivat wrote:Purely hobbyist. The CP/M system is a Z80 based system I assembled about 20 years ago. I wrote the BIOS and produced most of the PCBs. For the BIOS code I also wrote the floppy disc routines, the system contains an INTEL 8272 floppy disc controller chip which (as far as I remember) was quite tricky to program.

ok

. so your system used 1KB sector size ?

shprivat · Post by **shprivat** » Wed Aug 19, 2009 9:34 pm

Jeff wrote:
shprivat wrote:Purely hobbyist. The CP/M system is a Z80 based system I assembled about 20 years ago. I wrote the BIOS and produced most of the PCBs. For the BIOS code I also wrote the floppy disc routines, the system contains an INTEL 8272 floppy disc controller chip which (as far as I remember) was quite tricky to program.

ok . so your system used 1KB sector size ?

Yes, at least as far as I remember. I haven't used this system for at least 15 years, I found it in my cellar some weeks ago and thought I give it a try. Then I found out that now the floppy disk is very unreliable so I thought I replace it with your standalone SD card solution (I even ordered one HxC USB version from the latest batch from Peter Sieg in order to see if this works too). Since I do not have the BIOS assembler code anymore I have to stick with 1K sectors since I can't change the system. And even if I still had the sources I wouldn't change anything in the BIOS code because my Z80 assembler skills are very rusty after 20 years...

I just checked one of my old diskettes with ImageDisk and realized that my CP/M system uses a DD floppy, so the disk was formatted with 800K. I was very surprised that the disk is still readable after such a long time.

Sven

Pryanick · Post by **Pryanick** » Wed Aug 26, 2009 3:37 pm

1k/sec is very usefull for using HxCFE under ZX-Spectrum. There is an iS-DOS operating system. Some ZX-clones in ex-USSR use iS-DOS operating system. After publishing PCB HxCFE my version on my web site I had questions about using HxCFE under iS-DOS (iS-DOS uses 1ki/sec). But nothing can be done - 1k/sec not supported /yet/.
I think, Jeff, we have anough free memory in 4620 to make 1k/sec support. But I have no hardware to test it.

HxC Floppy Drive Emulator

Problem assembling SDCARD version

Problem assembling SDCARD version

Re: Problem assembling SDCARD version