More Hardware for Zetro - A600 8mb fast ram ! (with love from Russia)

[Zetr0]

@Lord Vader

the LUCAS project provides an 020 PGA and 68881 fpu for an A1000 / A500 socket, the project is based around 4 PAL's ( 3x PAL16R4B & 1x PAL16L8 ) and 4 74x logic chips ( 3x 74F74 and 1x 74F04)also the obligatory handful of caps / resistors

there is provision to run the 020 async upto 20mhz and have a separate OSc. for the FPU ie. 33/40mhz.

there is no provision for a memory add-on other than in the form of a pin array that the basic schematic has, so with a little timing math and a lot of luck it should be possible to add a simple memory controller.

i have attached both the Frances and LUCAS projects

[Zetr0]

@Alexh

I have to admit Jens got the right idea there!!! it shouldn't be too difficult to implement screw holes into the design, i think just getting the design up and running would be a bonus at this stage....

personally i think one should be able to make an 020@20mhz + 8mb ram upgrade for under $20. and with a little mass production this would drop much lower.

the A600 design would be easily reworked for for an A500, arguably slap on an IDE interface and whoop...

[alexh]

The only alternative is to superglue the accelerator/ram card to the 68k which isnt nice.

[Zetr0]

HOT GLUE

naa thats pretty nasty in its own right...

I was thinking of using the HD mounting holes but in a subtly different way, by using a small plastic mount into the hole and the a screw from the top face of the card into the mount for a secure fit.

[Photon]

If there are no moving parts, I don't see why you can't simply cut out a block of isolating material and glue that to the lid of the A600. Will keep the board from popping out of the socket very well, as long as it's firm enough and isn't extremely heat sensitive.

Only Intel type CPUs get super hot, so shouldn't be a problem. Drilling holes in PCBs... superglue... ugh :P

You can make the internal height of the block required by putting objects of varying height (whatever, playing cards :P) until it fits nicely, then measure the height of whatever you put on there.

[alexh]

Originally Posted by Photon

Drilling holes in PCBs... ugh :P

My point is that if they were made to use the holes that already exist like Jen's design....

[lvd]

Originally Posted by Zetr0

i have 6 at the moment, i am more than happy to donate a couple for you projects as long as you promise to post hardware pics and hardware pron

Well, thank you, I think this will be useless. I'm not planning any 020-based devices to do for amiga =) But who knows...

[lvd]

Originally Posted by Zetr0

the LUCAS project provides an 020 PGA and 68881 fpu for an A1000 / A500 socket, the project is based around 4 PAL's ( 3x PAL16R4B & 1x PAL16L8 ) and 4 74x logic chips ( 3x 74F74 and 1x 74F04)also the obligatory handful of caps / resistors

I'd better use one epm7128 or even ep1k10 =)

there is no provision for a memory add-on other than in the form of a pin array that the basic schematic has, so with a little timing math and a lot of luck it should be possible to add a simple memory controller.

There should be no problems, I hope, to add DRAM controller. Most problematic in my design was that only CPU 7Mhz clock is available, forcing me to have semi-asynchronous design (a lot of flip-flops with asynchronous clears, final /RAS'es and /CAS'es are not synchronous as well).

[Zetr0]

@lvd

indeed an epm7128 would reduce the foot print of the board and obviously only having to program one chip as opposed to 4 is definitely a bonus!.

I haven't checked but i believe there are tight propagation delays on the LUCAS project i think the emp7x series should be okay thought.

I have to admit that damn 7Mhz clock is a pain. I did have a look at feeding another clock but still one has to XOR at 0.7 (CDAC) so i think most designs plumb for async, However saying this i think the Frances project allows for a synchronous design at 16 / 20mhz (ish lol) i really need to sit down and absorb it all

[Dizzy]

http://www.heise.de/ct/machflott/projekte/55771

[Zetr0]

@Dreamcast Dizzy

from that pic my friend, i have decided that there are some poeple out there that do not deserve computers.

[Dizzy]

it's one of Retro-nerds friends

[Retro-Nerd]

Originally Posted by Dizzy

it's one of Retro-nerds friends

Looks like they found the Amiga stuff in bulk rubbish. A nice mod, can you beat this Zetty?

[Zetr0]

I donno.... they show some serious skills with the sellotape!!!

mind you our forum chummy Mick_AKA built this one lonely night..

[Dizzy]

She looks kind of sticky

[Magno Boots]

This is a great breakthrough.

I'm sure there would be a commercial market for a finished product (although limited).

I would definately buy one.

Keep up the good work!

[Methanoid]

Originally Posted by Zetr0

personally i think one should be able to make an 020@20mhz + 8mb ram upgrade for under $20. and with a little mass production this would drop much lower.

NOW you are talking...

[ohforf]

Originally Posted by Zetr0

personally i think one should be able to make an 020@20mhz + 8mb ram upgrade for under $20. and with a little mass production this would drop much lower.
the A600 design would be easily reworked for for an A500, arguably slap on an IDE interface and whoop...

$20 would be very cheap. If you offer this for the A500, you will get lots of Customers.
If you manage to add autoconfig-IDE, its a must-have for every A500 User.

[Smiley]

Right basically, Zetr0, make a small batch of these and sell one to me. That will get me back into using Amigas.

(I would also need a new A600)

[Amiga-Digital]

Originally Posted by Zetr0

@Chain

Thank you for the hardware pron... indeed its delicious!!!!

the funny thing is that the pcb electronic prototype i made is actually about that size LOL.. not sure on the physical proto in the pic, but all mine could do was upto 4mb. and to be honest, i am not sure there would be enough juice to power it LOL. I have been looking into replacing those 30pin simms with one 72pin sim, as well as possibly small factor 72pin sim (similar to old laptops) it all comes down to available memory, clearly 72pin is in abundance.

@Lord Vader

Most of the PGA 020's that i found are on ebay, and there over priced IMHO, so i decided to get a small cache' of these ic-china
i have 6 at the moment, i am more than happy to donate a couple for you projects as long as you promise to post hardware pics and hardware pron

Hello Zetro

if you locking for the 68020/16mhz cpu's that are use on the amoga 1200 i have plente of then new here at home got 660 pcs. buy from along time back on ebay so if you wil build a 020/16mhz board let me no i can help you with the cpu's

cheers