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Re: Hermes status
Posted: Sun Sep 19, 2021 5:47 pm
by Pr0f
so is it ok to post dissassembly (partial) on here now then?
Re: Hermes status
Posted: Sun Sep 19, 2021 6:09 pm
by Nasta
Pr0f wrote:so is it ok to post dissassembly (partial) on here now then?
I would think yes since Lau was ready to give out the source, when he manages to find it...
Re: Hermes status
Posted: Sun Sep 19, 2021 6:26 pm
by Pr0f
Nasta wrote:Pr0f wrote:so is it ok to post dissassembly (partial) on here now then?
I would think yes since Lau was ready to give out the source, when he manages to find it...
ok - so this is incomplete - and may have inaccuricies in it - the idea would be to build upon it...
Re: Hermes status
Posted: Mon Sep 20, 2021 8:35 am
by Derek_Stewart
HI,
Assuming Hermes is now GPL, here is the Hermes distribution, with the Hermes v2.2 rom image, only 2K in size.
- Hermes22.zip
- Hermes Distribtion Disc & ROM
- (16.51 KiB) Downloaded 240 times
Here is the Intel Data sheet:
Re: Hermes status
Posted: Mon Sep 20, 2021 11:52 am
by mselkin
Could anyone recommend an entry level programmer that could program the 8749?
Re: Hermes status
Posted: Mon Sep 20, 2021 12:05 pm
by Pr0f
The problem with a lot of the entry level programmers is they do not generate the larger voltages required to program some of the older chips - and that is going to be your biggest problem
All I can suggest is check the device list (usually a downloadable text document or pdf) for the programmer that lists the devices supported.
Re: Hermes status
Posted: Mon Sep 20, 2021 12:13 pm
by Pr0f
Also - by the time you've spent money out on a programmer and finding a source of unused or windowed chips you can erase, you may as well buy the Hermes with it's printed manual - at just over £20 it's well worth it - although it looks like RWAP have no stock at present.
Re: Hermes status
Posted: Mon Sep 20, 2021 1:26 pm
by mk79
mselkin wrote:Could anyone recommend an entry level programmer that could program the 8749?
No, there is none. I linked to a DIY one somewhere here, but that's a quite a lot of work and money, too, of course.
Re: Hermes status
Posted: Mon Sep 20, 2021 2:01 pm
by Pr0f
The HiLO systems programmers from a generation or 2 ago can program these chips - but the software doesn't even run on Windows 7 - so you'd need XP or earlier to run them - it seems to run in a VM - as long as your machine can pass through the serial port or USB port and not drop data. Otherwise you may have to go hunting around for an old PC too.
I've used ALL-11P2 from HiLo Systems - that can read / write these chips - but finding a working one is hard now.
You might try here if adventurous :
https://laughtonelectronics.com/oldsite ... mcs48.html
https://www.eevblog.com/forum/repair/in ... h-arduino/
I think this is the one Marcel found:
http://www.mattmillman.com/projects/hve ... er-reader/
Rumours are that one of the Wilhelm programmer boards might be able to program these chips - not confirmed this.
None of the cheaper "universal" Chinese programmers can handle this chip - I have TSOP2005, TSOP48 and the TL866CII and it's XGECU successor.
Re: Hermes status
Posted: Mon Sep 20, 2021 3:22 pm
by martyn_hill
Hi Silvester
I can confirm from my own experience what has been written below - namely that you'll need a legacy device, such as the Willem LPT-based programmer - and with a suitable IC adapter - to read and (if you have a windowed IC variant) re-programme the 8x49.
It is costly to find these programmers online and you need a host PC with an LPT port and power the programmer with an external 12V PSU. Then you need to find software that will run on your chosen host PC - I was able to run the software I found in Windows 7 - eventually...
All in all, a chore that, unless you actually intend to further develop the Hermes firmware, means its probably wiser to buy from RWAP (when his stock is replenished...)
Good luck!