First impression

caTTerror V.1 expansion card for TTs
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Re: First impression

Postby Administrator » Mon Jul 25, 2016 3:42 pm

1. Fully populated except SIMMs. Soldering TQFPs by hand is a more "advanced manufacturing technology".
2. Yes. Two cables need to be soldered to the Interrupt line (same as ACSI and FDD) and /DSACK1. Otherwise IDE won't work.
But I will write a documentation with photos where to solder the two cables to the mainboard. I'd say it's pretty easy.
3. Yes.
4. Depends. Have a look at the DRAM ICs. In general: all SIMMs that work with a MagnumTT will work with caTTerror V.1:
http://dev-docs.atariforge.org/files/Ma ... ish%29.pdf table on the left hand side.
When the project is in its final stage then I will publish a list of DRAMs I tested myself successfully. 4MB/8MB SIMMs seem to be
non-critical. I used these with either 8 or 16 ICs and 2 or 4 ICs respectively without a problem. Access time is non-critical either.
TT's 16MHz bus is pretty slow. Even 100ns should work - if you can get such slow PS/2 SIMMs anywhere.
5. Yes. You can either buy an already patched TOS 3.06 (US/UK/GER/FR) in my shop or you can apply the patch yourself and
program/burn the EPROMs yourself.
The patches are textfiles based on the syntax of Markus Heiden's incredible TOSPatch program:
http://download.markusheiden.de/atari/tp306v20.lzh
But I have to check the patches for US/UK/FR TOS before publishing them.
Four patched 3.06 EPROMs will be available for 12EUR.
6. Shipping: somewhere in the 10-15EUR range. Board cost: somewhere between 80-120EUR.
7. When it's done ;)
Honestly: I haven't put any progress in the project lately. It's summer and OTOH noone seemed to be interested in the project at all.
As I wrote earlier in this thread: I'm not gonna spend hundreds of Euros on 4-layer PCBs if just one, two people show interest.
It's easier to burn the banknotes immediately.
EmpireAndrew
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Re: First impression

Postby EmpireAndrew » Mon Jul 25, 2016 4:22 pm

Well, let me know if you decide to ahead and sell them as I'd like one.

If you decide not to risk the money making them are you going to release the plans for someone else to take the risk and do so instead?
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Re: First impression

Postby Administrator » Mon Jul 25, 2016 5:04 pm

EmpireAndrew wrote: If you decide not to risk the money making them are you going to release the plans for someone else to take the risk and do so instead?
NO! Definitely not. Why? I call it life experience.
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Re: First impression

Postby EmpireAndrew » Mon Jul 25, 2016 5:32 pm

I'm not sure what you gain with that philosophy, in fact everyone loses really, but that's your right to choose.
I'm more... community spirited.
I'll pay someone for their work if they want to try and make a business, but I prefer open source.

Anyway... if you decide to sell let me know.
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Re: First impression

Postby vhenares » Mon Sep 19, 2016 7:28 pm

I am interested in this project. I would like to know price and availability.

Thank you for you job, is very interesant.

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Re: First impression

Postby Administrator » Sat Jan 14, 2017 11:30 am

Till christmas I started working on caTTerror again. Little progress:

Image

I have taken a screenshot with my scope showing you a read-burst access.

Image

As you can see there is a pretty large gap between two read-burst transfers when the CPU is busy internally. So increasing read-burst speed more won't make a large difference - IMHO. Just increase cost (by factor 4) for a faster CPLD.

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