Megachip for A500, A2000, and CDTV (rj1307 project, Poland)

[DjCook]

User BigSupes has received his Megachip

Parcels sent to users optiguy & demolition

Payment received from user viserys23 for 1x Megachip WITHOUT Agnus IC

[optiguy]

Great news, will let you know when it arrives

Sent from my SM-G930P using Tapatalk

[hlide]

Declaring interest for 1 kit without Agnus.

[BigSupes]

..Do you have installation instructions available based on board revision number? Basically what do I do with the single wire that is included. I know it should run from the megachip to the motherboard but where on the motherboard?

Hi,
Glad to hear Your parcel arrived. Instructions are as follows:
1. Desolder old PLCC Agnus socket
2. Solder in a new one that was delivered with adapter
3. Insert new adapter (be careful and watch the correct position of Pin1
4. Connect A20 wire to A20 signal on the motherboard (grab a multimeter and find the nearest point to the Megachip)
5. Install new Agnus and run systest (scan memory)

Enjoy 2MB ChipRAM

Hi, what power output should I be looking for with the multimeter?

Sent from my SM-G950F using Tapatalk

[demolition]

A20 can be found on Gary (U5) pin 36 or the CPU (U1) pin 48 so you could choose to connect the wire against one of these two pins. It is also connected to one of the pads in JP5 on A500 Rev 6 boards, but this is where the multimeter comes in handy as you can use the continuity test to verify against the known point on U1 which is A20 on all revisions.

This is the schematic of A500 rev 6 and you can search for A20 to find the locations:
https://www.amigawiki.org/dnl/schematics/A500_R6.pdf

[demolition]

Package received - FB on the way.

[DjCook]

payment info sent to user radfoo



- - - - - Update - - - - -

Payment received from user radfoo for 2x megachip WITHOUT AGNUS
will update tracking info once parcel is sent
regards,


Viktor

[radfoo]

Payment sent for two boards, thanks.

[DjCook]

Payment info was sent to Overdoc & britlord hope you, guy's still want them

[britlord]

Payment info was sent to Overdoc & britlord hope you, guy's still want them

Payment sent for megachip....

[DjCook]

Payment received from Britlord (pending question)

[SukkoPera]

Parcels for BigSupes and SukkoPera was sent

Package received (it sat at the Post Office for a while), not installed yet, but all looks perfect. Feedback coming.

[DjCook]

Parcels sent to users:
radfoo ( 2× without Agnus)
britlord (1× Vomplete with Agnus chip)
Tracking info will follow with PM

- - - Updated - - -

Payment received from user Tbtorro for 2x Megachip without Agnus

[DjCook]

Has anyone confirmed this is working on NTSC CDTVs? I use the workbench quite a bit on mine and could use the extra chipmem.

have ordered some NTSC Agnus chips, will ba able to test soon

Still no answer from Overdoc

[britlord]

Interested in another one.. Built with a PAL Angus chip.....