A500 Dual Kickstart 1.3-3.1

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@TC

Hi Bas,

Thanks buddy I will check my email. :thumbsup:

@djos

Thanks buddy, yeah! is the same diagram I have, my question with this one is if I need one 4K7 resistor in the 5v line. Some members told me is not required but desirable.

About pins, of course, pins 1 & 42 are out :lol: I have good quality 42pin sockets to do the soldering jobs (and to not touch the EPROMs) :)

:thanks:to all. I will try again this evening/night
 
merlinkv said:
@djos

Thanks buddy, yeah! is the same diagram I have, my question with this one is if I need one 4K7 resistor in the 5v line. Some members told me is not required but desirable.

About pins, of course, pins 1 & 42 are out :lol: I have good quality 42pin sockets to do the soldering jobs (and to not touch the EPROMs) :)

:thanks:to all. I will try again this evening/night
Click to expand...

Cool, enjoy. :cool:
 
Well... bad news :(

Without resistor between pin1 & pin22 cant boot.

With 4K7 resistor between pin1 & pin22 I can boot only one of the KSs.

I've used two variants:

SPST switch ON-OFF with two solder points/pins
swtich pin1 => EPROM pin1
switch pin2 => GND

and

SPST switch ON-OFF with three solder points/pins
swtich pin1 (left) => EPROM pin12 (GND)
switch pin2 (center) => EPROM pin1
switch pin3 (right) => EPROM pin22 (5v)

But no way :shrug:

My A500 is

mobo Rev6A
MiniMegi CHIP PAL (Made In @stachu100 :lol:)
Indivision ECS
1/2 MB RAM with clock

Any idea?

:coffee:
 
Hi mate

Did that file I send you not work :blink:

It's a proven design and file as its fitted to all my ecs systems including the a600

that resistor you are using is defnitely 4k7, ie 4700 ohms..

Please take voltage readings at pin 1 with the switch in both positions.

Wierd

TC :)
 
Hi Bas,

Yes, don't work... I don't know for what.

Resistor is a 4K7 one it's sure :)

Mobo is nice refurbished but OK, time to multimeter, I will check voltages.

More updates later....

Thanks again & Best wishes
 
Being following this tread a bit, and it all sounds really weird?!
What programmer are you using?
Are you sure that the EPROM is programmed correctly; type, Vcc, Vpp etc.
I assume that you've tried to actually read the EPROM after programming and compared with the file you've programmed...if not, try using romcmp.exe (that comes with MAME) with the '-d' option; it does a pretty good analysis of binary files.
Are you sure that the EPROM-IC is not knackered; have you tried an other one?
I find it really strange, that it just doesn't work?!
 
Why I'm under the impression that for A500 you need to do some mod?
In A600 we have 42pin kickstart socket while on A500 you have 40.
Since you're using an 27C800 1MB ROM you're using 42pins. I'm under the impression that I saw somewhere that you need to tie Pin1 and Pin42 to Gary.

P.S. Ok I found that in Cosmos blog here: http://leblogdecosmos.blogspot.gr/2010/03/kickstart-1mo-a500-i.html

Haven't done that in A500 but you can ask him just to be sure if others can't help here.
For A600 I can vouch it works (along with the Dual Kick that you must have from me :))
 
mfilos said:
Why I'm under the impression that for A500 you need to do some mod?
In A600 we have 42pin kickstart socket while on A500 you have 40.
Since you're using an 27C800 1MB ROM you're using 42pins. I'm under the impression that I saw somewhere that you need to tie Pin1 and Pin42 to Gary.

P.S. Ok I found that in Cosmos blog here: http://leblogdecosmos.blogspot.gr/2010/03/kickstart-1mo-a500-i.html

Haven't done that in A500 but you can ask him just to be sure if others can't help here.
For A600 I can vouch it works (along with the Dual Kick that you must have from me :))
Click to expand...

On my A500 it worked just by one wire 5V or nothing, it was a high revision, a plus board without rtc and chips fitted, I must admit.
 
Elgen said:
Being following this tread a bit, and it all sounds really weird?!
What programmer are you using?
Are you sure that the EPROM is programmed correctly; type, Vcc, Vpp etc.
I assume that you've tried to actually read the EPROM after programming and compared with the file you've programmed...if not, try using romcmp.exe (that comes with MAME) with the '-d' option; it does a pretty good analysis of binary files.
Are you sure that the EPROM-IC is not knackered; have you tried an other one?
I find it really strange, that it just doesn't work?!
Click to expand...

Hi mate,

Thanks for the info :)

Programmer & EPROMs are OK as I use in my A600's (27C800) and in my A4000D's/A1200s (27C400) without issues.

Images are, in some cases, extracted from my original ICs and, in other cases, are decrypted ROMs from my legit AmigaForever 2012.

All EPROMs I use are tested & verified before to be installed in my Amigas.

mfilos said:
Why I'm under the impression that for A500 you need to do some mod?
In A600 we have 42pin kickstart socket while on A500 you have 40.
Since you're using an 27C800 1MB ROM you're using 42pins. I'm under the impression that I saw somewhere that you need to tie Pin1 and Pin42 to Gary.

P.S. Ok I found that in Cosmos blog here: http://leblogdecosmos.blogspot.gr/2010/03/kickstart-1mo-a500-i.html

Haven't done that in A500 but you can ask him just to be sure if others can't help here.
For A600 I can vouch it works (along with the Dual Kick that you must have from me :))
Click to expand...

Hi Marios, my friend :)

I'm thinking here is the problem, maybe a compatibility issue with my setup as I'm using MiniMegi PAL with connection to the Gary IC, IndiECS, SuperDenise and a trapdoor 1/2 CHIP RAM expansion. I will try this weekend with a "plain" setup using the original Agnus, Gary & Denise.

For A600 I followed this setup http://stuger.net/index.php/amiga/88-dual-boot-kickstart and works great.

jvdbossc said:
On my A500 it worked just by one wire 5V or nothing, it was a high revision, a plus board without rtc and chips fitted, I must admit.
Click to expand...

Yeah! As I said, maybe is an incompatibility issue with my setup.

---------------

One last question....

Maybe I need to supply more power to the mobo? There is not problem if I use the floppy power connector in the mobo to supply more power to the system?

Thanks to all for your help :thumbsup:

More test to follow this weekend..... :)
 
Last edited:
I got this running using Marios' method a while ago, working stellar since too. I hope you get it running ok mate!
 
Hi again :)

Well this evening/night I want to try again :whistle:

I see in other sites (big thanks Marios :thumbsup:) the 27C800 pins 1&2 are connected to the Gary IC at 35 & 36 pins to make possible to work with KS 3.9.x.

Of course, I don't want 3.9.x but 1.3-31 in one 27C800, I'm not an engineer but I have one idea....

My MegaChip is also connected to the Gary 35&36 pins (need to check exactly I'm at work now). But, It's also possible to connect the EPROM at Gary at the same time? Nothing go to "Burn in Hell"?

Maybe, as Marios saids, EPROM pin1 & 42 to gary? But which Gary pins? 1 to 35 & 42 to 36?

Also If I don't remember bad, another of our great Masters (aka Mr. @Zetro0 :lol:) recommend to solder one SIL 4K7 resistor at RP110. I have now these resistors soldered at RP106 & RP107. Nothing wrong with one more (RP110)?

Thanks in advance :)
 
Hi again :)


Finally I've found the problem... a bad MegaChip contact. After cleaning carefully the Agnus socket & the MegaChip contacts....

Everything WORKS :thumbsup2: :bounceBoingBall: :thumbsup2:

The schema I've used is:

R106 => SIL resistor 4k7
R107 => SIL resistor 4k7
EPROM => pin1- 4k7 resistor -pin22

SPST switch ON-OFF with two solder points/pins
swtich pin1 => EPROM pin1
switch pin2 => GND

Thanks a lot to all for your help & support :thumbsup:
 
There you go you silly bugger, told you the wiring and firmware was correct :lol:

Enjoy
TC :thumbsup:
 
TheCorfiot said:
There you go you silly bugger, told you the wiring and firmware was correct :lol:

Enjoy
TC :thumbsup:
Click to expand...

Hi Bas, :)

Yeah the wiring was correct also I've burned two EPROMs to test, one with your file and other with my self-made. Both works great :thumbsup:

Thanks again my friend :thumbsup:
 
Hi again my friends :)

I've :Doh: to publish some pics :)

First the SIL 4K7 resistors:

DSC00846.jpg DSC00847.jpg

DSC00848.jpg DSC00849.jpg

The 42 pin socket with 4K7 resistor -isolated- from pin1 to pin22:

DSC00845.jpg

To be continued....... :)
 
More pics :)

Switch connections...

DSC00850.jpg DSC00851.jpg DSC00852.jpg

An external view of the switch

DSC00857.jpg DSC00858.jpg

And two screenshots:

DSC00853.jpg DSC00856.jpg

And that's all....for the moment.... :lol:
 
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