A600 4MB RAM upgrade board (was 8MB)

[DonAmiga]

^^^ yes one of those would be cool

[majsta]

@ Boboo_SK Yes I know that RAM added later but wanted to say that only CPLD can be used here for as,r/w,uds,lds and dtack and also for adding memory so GAL can be removed but as you started with GALs in your earlier projects I understand why you continued to use it, but now it is not needed and it is waste of space, time for programming and increase production cost. So it is hard to produce something like this because you need GALEP or some other programmer with expensive socket adapter. Instead this, on that place where is GAL you can add Altera Max or something and use simple JTAG chain to get everything working with just one logic device instead of two. But again I don't see the point because we are stuck with little memory. Start working with FPGA's and you will understand why I m telling that there is no point of building anything else because we can add to FPGA everything even wireless, usb etc... And drivers are already there for many things.

[SleepyMan]

Well i'm interested, if a production is possible sign me up for 1 4MB and a 8 MB version . Will be following this thread..

[cpiac64]

i have 24 ram for 12 expansion, i can create one past 20 maj for test on a600

if insert a socket for 68000 dip for use with a500, cdtv and a2000, i suppose increment of interest.

[Boboo_SK]

@ majsta
You still need to get a lot of experience, than you will understand that FPGA is not the recipe :-)

[majsta]

Hehe my friend I m in the mission to prove that you and everyone else is wrong If you could see my yesterdays testings you could understand why I m going this way

[kipper2k]

Originally Posted by majsta

Hehe my friend I m in the mission to prove that you and everyone else is wrong If you could see my yesterdays testings you could understand why I m going this way

So question is, how long before it is usable? i know you've been working on this for a while. I've seen a lot of projects start and for one reason or another just fizzle away. If this project is going to be completed soon and at a small cost then it would be worth buying instead of a straight forward memory expansion, if its going to be a while then people get impatient and look for other available options

[majsta]

Yes I understand that but but as you helped me be shore that I will never forget you I m honest person. So current status is working accelerator and now I m trying to take over the bus and disable old CPU. How much time, maybe few days maybe few years, with this things you ll never know as there is noone who wants to share information's with me. I only said on this topic that I don't see any point of building this mem upgrades when I already have board with SDRAM on it and it is easy to use my design to add that memory only without adding another emulated CPU which is my goal. But in the other hand every hardware for Amiga is treasure and even I ll build one A600 with just mem upgrade just to play games it is enough. Only thing I can promise I ll never give up I m not that kind of person.

[kipper2k]

Originally Posted by majsta

Yes I understand that but but as you helped me be shore that I will never forget you I m honest person. So current status is working accelerator and now I m trying to take over the bus and disable old CPU. How much time, maybe few days maybe few years, with this things you ll never know as there is noone who wants to share information's with me. I only said on this topic that I don't see any point of building this mem upgrades when I already have board with SDRAM on it and it is easy to use my design to add that memory only without adding another emulated CPU which is my goal. But in the other hand every hardware for Amiga is treasure and even I ll build one A600 with just mem upgrade just to play games it is enough. Only thing I can promise I ll never give up I m not that kind of person.

Sometimes its tough to get peoples interest to offer help. If i remember right, Shadowfire is pretty well versed on the Amiga Hardware so i am not sure if you can reach out to him. My knowledge is not that good in that area. I'm sure there are people that would help.

Posting questions is probably the best way to start in the Hardware threads, you'd be surprised hopefully of the knowledge of some people.

[kipper2k]

Hi All,

If i was to build this 4mb expansion board and if i was to create a layout, would the layout shown below work in an A600. I dont know of all the different addons etc that could be used in conjuction with this so here it is, would this layout interfere with any other addons ?




And yup, this board is pretty dead lol

[duga]

Originally Posted by kipper2k

Hi All,

If i was to build this 4mb expansion board and if i was to create a layout, would the layout shown below work in an A600. I dont know of all the different addons etc that could be used in conjuction with this so here it is, would this layout interfere with any other addons ?




And yup, this board is pretty dead lol

I think that's okay. Make sure it fits underneath the keyboard.

[majsta]

Yes this is ok. But you didn't think about JTAG header but it can be removed once device is programmed. But if you leave it it could cause problems so find place for it. And if you want to use that try hole socket you could get lot of problems there. You need to investigate lot of things there to understand that socket because it can't be used like you want it as shown on that image!!! PLCC-68 socket who can be mounted on surface is easy to use but this one is not!

[kipper2k]

Originally Posted by majsta

Yes this is ok. But you didn't think about JTAG header but it can be removed once device is programmed. But if you leave it it could cause problems so find place for it. And if you want to use that try hole socket you could get lot of problems there. You need to investigate lot of things there to understand that socket because it can't be used like you want it as shown on that image!!! PLCC-68 socket who can be mounted on surface is easy to use but this one is not!

The 68 pin plcc socket fits on the underside, and the jtag header is not really required as the chips can be programmed off my master board and the 7032 can be removed via a plcc socket which would be used. I would probably add a jtag header but that can be put pretty well anywhere, main thing is to get all data/address lines in

[duga]

Originally Posted by kipper2k

The 68 pin plcc socket fits on the underside, and the jtag header is not really required as the chips can be programmed off my master board and the 7032 can be removed via a plcc socket which would be used. I would probably add a jtag header but that can be put pretty well anywhere, main thing is to get all data/address lines in

Do you have a price ready, +/- $10?

[kipper2k]

Originally Posted by duga

Do you have a price ready, +/- $10?

I reckon about $30, dependent on shipping charges, i am trying to buy enough for a bulk order but at the same time trying not to buy too many so i don't get stuck with excess parts. I am thinking about 50 boards
but as always subject to change

edit, may have to change design as the way i have it would cause data and address lines to cross which is not good

[majsta]

The 68 pin plcc socket fits on the underside

I told you check 10 times before you start working with this socket. I build about 20 accelerator boards thinking that pins on those sockets are in correct order but they are not, and even socket doesn't fit to MC68K when you turn it like it should be, and when you find out that and turn it around pins does not match. I know what I m told you here because it took me more than 20 working hours to find out what's wrong with this socket.

[kipper2k]

Originally Posted by majsta

I told you check 10 times before you start working with this socket. I build about 20 accelerator boards thinking that pins on those sockets are in correct order but they are not, and even socket doesn't fit to MC68K when you turn it like it should be, and when you find out that and turn it around pins does not match. I know what I m told you here because it took me more than 20 working hours to find out what's wrong with this socket.

I mirrored the socket, I have put one of my 68 pin sockets over the cpu and checked clearance, if i have to create a daughter board then so be it. I have mapped the pins to allow for the socket being upside down/back to front. I can post a pic of the socket sitting nice and snug

[majsta]

Ok thats ok

[duga]

50 boards is good for the first batch.

[mutch]

Appears to clear the A603 in my bog-standard A600, which also has your excellent adapter board kipper! If its mainly aimed at un-accellerated machines a board around the template dimensions should be sweet, even with various IDE-flash adapters and cables. Rom switcher cards??? Height over the lower DRAM to keyboard clearance maybe an issue, otherwise, you've got the ball, run with it, and count me in for one!