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#1 |
Registered User
Join Date: Dec 2005
Location: Brisbsne / Australia
Age: 76
Posts: 23
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![]() ![]() What advantage would it be to install a Super Agnus 8375 2MB ChipRam in a A2000? |
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#2 |
Miggy Man
Join Date: Nov 2004
Location: Cornwall, United Kingdom
Age: 40
Posts: 831
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Umm.. It gives you 1MB more chipram...
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#3 |
Registered User
Join Date: Aug 2001
Location: Germany
Age: 51
Posts: 3,704
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No, the install of a 8375 Agnus will NOT give you more Chipram, it only makes the A2000 capable of Adressing 2MB ChipRam but you will need to Hack the Board to do so !!!
I dont even know it that is possible to an A2000 Board ... better get a Mini-Megi Chip for your A2000, theres the 8375 on it and 1MB Chip to expand the A2000 ... |
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#4 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,624
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The 3875 comes in two flavours, PAL and NTSC. Make sure if you buy one or a Mini-Mega that you get the right one for you.
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#5 |
Registered User
Join Date: Jun 2005
Location: US / A
Age: 49
Posts: 134
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It did come in two flavors, but couldn't you short two pins on the PAL version to fool it into thinking it was NTSC? Or maybe the other way around. I seem to remember something about that but those brain cells are swimming in the darkness right now.
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#6 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,624
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That was the previous version, the 8372, where there was one ASIC for both PAL and NTSC
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#7 |
Registered User
Join Date: Jun 2005
Location: US / A
Age: 49
Posts: 134
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Ah, thanks! I do have the 1MB version in my A2000.
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#8 |
Registered User
![]() Join Date: Jan 2020
Location: Wisconsin, USA
Posts: 200
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Since this has not been answered in forever, figured I would ask again... What is the final step to access 2 meg chip ram with the 8375 Agnus on the A2000?
j101 has been switched, j500 has had the jumper removed (rev 6 mainboard, NTSC) It works fine at 1 meg chip ram with just that, but I would like to also access the other 1 meg this Agnus can address if possible. I have checked for Mini Megi kits and am unable to find any for sale which leaves me with altering the board myself. Since I restore systems, A1000 and on up, this is not an issue if I can find the procedure to complete the upgrade for the A2000 now. |
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#9 |
Registered User
Join Date: Jan 2016
Location: Germany
Posts: 382
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Should work like this : https://blitterwolf.blogspot.com/201...for-a2000.html
Never did this myself so be warned .... ![]() |
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#10 | |
Registered User
![]() Join Date: Jan 2020
Location: Wisconsin, USA
Posts: 200
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Quote:
My only concern.. that hack is for the 8372B chip.. I have an 8375... |
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#11 | |
Registered User
Join Date: Jun 2018
Location: Stockholm
Age: 48
Posts: 278
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Quote:
https://github.com/LIV2/A500-2Meg-Chip-ram/tree/PLCC Note that it uses the DRAM chip onboard the adapter for the 2MB chip. The motherboard DRAM is not used. |
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#12 | |
Registered User
![]() Join Date: Jan 2020
Location: Wisconsin, USA
Posts: 200
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Quote:
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