Project of Megachip for Amiga

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Tuxbar81

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Hi there!

First of all, please, understand that this project is done during my spare time. I'm not a businessman... Thanks a lot! :)

So, if you're really in a hurry because your life depends on the Megachip, the best way for you is to open a Wanted thread.


Here is the launching of the Megachip project for the A500. The particularity of this version is the connection method.
Habitually, the Megachip is plugged in the PLCC support of the AGNUS chip of the Amiga motherboard.
To connect this new version, the PLCC support of the motherboard must be desoldered.

To intall the Megachip, two solutions:
- The Megachip is soldered directly onto the motherboard. This solution allow you to install an accelerator board in your A500!
- The Megachip is plugged onto a 84 pin PGA socket which is soldered on the motherboard. With this solution, the Megachip isn't soldered on the motherboard.
But the use of an accelerator is not possible due to the height of the Megachip.

The use of the Megachip works fine in two of my A500 rev6. The installation of the Megachip onto older A500 is possible. The modifications of the motherboard is a little different.

Here, some pictures of the Megachip installed into an A500 rev6:

Megachip1.jpg Megachip2.jpg Megachip3.jpg


The Megachip plugged on a PGA socket:

IMG_20170525_193211_HDR_resultat.jpg IMG_20170525_193109_HDR_resultat.jpg

The Megachip used onto an A500 with Automatic Kickstart Switcher, CSA Mega Midget Racer Accelerator and A590HD:

IMG_20181227_145757_resultat.jpg IMG_20181227_150620_resultat.jpg IMG_20181227_183320_resultat.jpg IMG_20181227_183837_resultat.jpg


The amount (excluding shipping cost):

From now, I'm forced to accept payment only as GIFT. I'm sorry, but if you're from a country where paypal doesn't accept GIFT transfert, I will not able to accept your interest. I really sorry for the inconvenience.

- As kit: 30€. This will include the PCB, the components and the 84 pins without AGNUS chip
- Assembled (without FAT AGNUS): 40€. If you are not able to solder the FAT AGNUS chip, you will have the possibility to send it to me. I'll solder it for you. The megachip will be tested before the shipment.


Which AGNUS do you need?

The board is designed for the AGNUS 8375. It has been tested with the revision 390544-01 (PAL). As the pinout of all 8375 revisions are the same, the Megachip should run with all of them, except the one used onto the Amiga 3000. List below from a post of fordav1:

Agnus (2MB) 8375 R0 318069-18 A500+ (PAL), A600 (PAL) <- Not compatible. A3000 AGNUS. Pinout different.
Agnus (2MB) 8375 R2 318069-10 A500+ (PAL), A600 (PAL)
Agnus (2MB) 8375 318069-11 A500+(NTSC) and A600(NTSC)
Agnus (2MB) 8375 318069-19 A3000 (NTSC), A3000T (NTSC) <- Not compatible. A3000 AGNUS. Pinout different.
Agnus (2MB) 8375 390544-01 A500+ (PAL), A600 (PAL)
Agnus (2MB) 8375 390544-02 A500+ (NTSC), A600 (NTSC)


Onto which Amiga this board works?

The design has been made for the Amiga 500.
The electronic design works onto the A2000 but the geometry design is not adapted for this computer.
The routing for the A2000 version is done.


Shipping cost:

International with track number: (Max height of the package: 3 cm)
Weight up to:
100g250g
France
2.16€3.92€
Europe & World5.80€9.70€



International with track number & registered: (begin with 0 to 500g...)

Weight up to:250g500g
France4.95€6.25€
Europe (Zone A - European Union, Switzerland)-12.30€
World Zone B (Norway, Eastern Europe except Russia)-16.65€
World Zone C (Other destinations)-24.35€



Interested members:(First mini batch)

Interested members:AGNUS
include in the kit!
Ready for shippingPMPaidPosted!
piacc64 (Italy)YES (P)YESYES
mattsoft (USA)YES (P)YESYESYESYES
keith1 (UK)YES (P)YESYESYESYES
holzroller (Germany)YES (P)YESYESYESYES
Pgovotsos (USA)YES (P)Assembled


Reservation for second batch:


The production of the PCBs will be launched when I'll have received the RAM and GAL ICs I have ordered.


MembernumberkitAssembledAGNUS
provided by member
AGNUS
include in the kit!
PMPaidPosted
Pgovotsos (USA)5xYESYESYESYES
Gravislord (USA)1YES
Schuimpy (The Netherland)1xYES (P)YESYESYES
Kirk_m (USA)1xYES (P)YESYESYES
freaktmp (Greece)1xYESYES
fordav1 (Australia)2xYES
timtheloon (UK)1xYES (P)YESYESYES
bobymiller (Germany)3xYESYESYESYES
el_pasi (Finland)2xYES (P)YESYESYES
cktwo (Germany)1xYES (P)YESYESYES
dallyis (Ireland)1xYES (P)YESYESYES
Neraka (Denmark)1xYES (P)YESYESYES
raparici (Spain)1xYES
voyager_1701e (Australia)2xYES (P)
for one
YESYESYES
Miru (USA)1xYESYESYESYES
Juzz (Denmark)4xYES (P)YESYESYES
Surfer (Italy)1xYES (P)YESYESYES
Rupture (Austria)1xYES
viserys23 (Norway)1xYESYESYESYES
crazybob_br (Norway)1x
AMike (Austria)1x
Doda (Czech Republic)1xYESYESYES
ishe (Hungary)1xYESYESYES
Raybeez (Poland)1xYES
britlord (USA)1x
Acill (USA)1x
McTrinsic (Germany)3x
THW (Germany)3x
Calvacanti (Germany)1x
gebes (UK)1xYES
Total49

Reservation for third batch:

The production of the PCBs will be launched when the second batch will be closed.


MembernumberkitAssembledAGNUS
soldered by member
AGNUS
Provided by member
Bprepared (UK)1x
kgthomps (USA)1xx
timtheloon (UK)2 (CDTV)xx
CrazyBob (The Netherlands)1xx
likanen (Finland)1x
stefan_st (Germania)1x
Drewlio77 (Canada)1x
ramparts (Portugal)1x
tuf (UK)1 NTSCx
tgca (Italy)1xx
limboy777 (UK)2xx
Astor (Portugal)1
a500guy (Australia)1xor x
elfoam (Australia)1x
Dano (Australia)1xor x
valfac (Spain)1xxx
BigF (UK)1x
cmorley (UK)1x
jpa (Finland)1x
 
Last edited:
Declaring interest in 2 kits.

Can you clarify which 2MB Agnus chips can be used? There are quite a few (list from BBOAH)....

Agnus (2MB) 8372AB 318069-03 A3000 (PAL), A3000T (PAL)
Agnus (2MB) 8372B 318069-03 MegAChip (NTSC)
Agnus (2MB) 8375 R0 318069-18 A500+ (PAL), A600 (PAL)
Agnus (2MB) 8375 R2 318069-10 A500+ (PAL), A600 (PAL)
Agnus (2MB) 8375 318069-11 A500+(NTSC) and A600(NTSC)
Agnus (2MB) 8375 318069-19 A3000 (NTSC), A3000T (NTSC)
Agnus (2MB) 8375 390544-01 A500+ (PAL), A600 (PAL) <-- on your adapter
Agnus (2MB) 8375 390544-02 A500+ (NTSC), A600 (NTSC)

We really need someone to reverse-engineer and make 2MB Agnus chips because there is a shortage.
There's not much point pulling the chip from an A600 or A500+ to put in an A500, we need new chips (which are not available).
 
Last edited:
Interested in one too


Sent from my iPhone using Tapatalk
 
Finally, an affordable Megachip solution for those of us who can solder.. Well done! I would like to take 2x of them - I guess in the next batch.
 
Last edited:
Project of Megachip for Amiga

Finally, an affordable Megachip solution for those of us who can solder.. Well done! I would like to take 2x of them - I guess in the next batch.

The question is does Tbtorro still have the Angus chips I'm sure you use to sell them

Then again I might of dreamt this he he


Sent from my iPhone using Tapatalk
 
Last edited:
Before everything, thanks a lot to all of you for your comments and PMs.
I'll try to answer to all PM. Don't be hurry! :)

After reading all PMs, I have updated the first thread to answer to some questions.

If you have declared your interest for the second batch, please, let me know if you want the Megachip as kit or assembled.
If it's as assembled, let me know if you'll solder the AGNUS chip by yourself or if you want I solder it for you (you'll have to provide the AGNUS chip).

Best regards,
Franck
 
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