Hi,
I found a Micronik RA-501 to expand the A2000 chipram to 2MB, but I don't have the schematic to connect the two wires to Gary chip. If any of you have it, could you please provide it to me?
Regards
GianDO
Micronik RA-501
Moderators: terriblefire, Terriblefire Moderator
Micronik RA-501
A2000 - MC68000 - KS3.1 - WB 3.1 - 2MB ChipRAM - Impact A2000-HC+8 Series II - 8 MB FastRAM - SD2SCSI 16GB - Indivision ECS
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terriblefire
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Re: Micronik RA-501
Best chance is looking at
Which looks to me to connect to pins 38 and 37 below..
Which would make sense. It probably doesnt matter too much which order they are in. Or at least it will not do damage if the order is reversed since the extra ram would just be used in a different pattern. If you find its not happy try swapping them.
- 100_3011.jpg (224.54 KiB) Viewed 3290 times
- gary-pin-out-amiga.png (15.14 KiB) Viewed 3224 times
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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terriblefire
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Re: Micronik RA-501
Quick maths check...
To address 2Mb of RAM you need 22 bits A[21:0] so my guess would be those are connected to A21 (37) and A20 (36).
A similar product is also hooking wires to this chip.
https://pmsoft.nl/amiga/mega-chip-two.html
Like i say you will not cause damage by connecting to the wrong address pin (provided you stay on an address pin) but it may not function as expected.
To address 2Mb of RAM you need 22 bits A[21:0] so my guess would be those are connected to A21 (37) and A20 (36).
A similar product is also hooking wires to this chip.
https://pmsoft.nl/amiga/mega-chip-two.html
Like i say you will not cause damage by connecting to the wrong address pin (provided you stay on an address pin) but it may not function as expected.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
Re: Micronik RA-501
ok, thanks for the reply.
So do I have to unplug Gary's pin 32 as well as shown in the last photo?
So do I have to unplug Gary's pin 32 as well as shown in the last photo?
A2000 - MC68000 - KS3.1 - WB 3.1 - 2MB ChipRAM - Impact A2000-HC+8 Series II - 8 MB FastRAM - SD2SCSI 16GB - Indivision ECS
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terriblefire
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Re: Micronik RA-501
No that just happened to be in the image i found. You can ignore that.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
Re: Micronik RA-501
ok thanks I'll try to follow your instructions.
A2000 - MC68000 - KS3.1 - WB 3.1 - 2MB ChipRAM - Impact A2000-HC+8 Series II - 8 MB FastRAM - SD2SCSI 16GB - Indivision ECS
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terriblefire
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Re: Micronik RA-501
Please let us know how you got on and what worked/didnt.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
-
terriblefire
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- Posts: 5389
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Re: Micronik RA-501
Adding some more pictures i found of this board
- Mikronic RA-500 front.jpg (59.07 KiB) Viewed 3223 times
- Mikronic RA-500 Back.jpg (47.26 KiB) Viewed 3223 times
- 5.JPG (71.75 KiB) Viewed 3222 times
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
-
terriblefire
- Moderator Team
- Posts: 5389
- Joined: Mon Aug 28, 2017 10:56 pm
- Location: Glasgow, UK
Re: Micronik RA-501
Looking at the last image I count (please check me) the 12th and 13th pin from the top as the address pins...
That ties up to my theory of pins 36 and 37. (Again please check me).
That ties up to my theory of pins 36 and 37. (Again please check me).
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
Re: Micronik RA-501
terriblefire wrote: ↑Tue Oct 13, 2020 9:19 am Looking at the last image I count (please check me) the 12th and 13th pin from the top as the address pins...
That ties up to my theory of pins 36 and 37. (Again please check me).
You were right about everything. I made the connections as you suggested and everything worked fine. Thanks for the advice and suggestions.
Also I confirm that even if you reverse the connections Gary everything works fine.
Thank you very much
G
A2000 - MC68000 - KS3.1 - WB 3.1 - 2MB ChipRAM - Impact A2000-HC+8 Series II - 8 MB FastRAM - SD2SCSI 16GB - Indivision ECS