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Tiny030, yet another 68k SBC in 100mm x 100mm format
http://www.easy68k.com/EASy68Kforum/viewtopic.php?f=10&t=1590
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Author:  neilbradley [ Thu Feb 28, 2019 9:10 pm ]
Post subject:  Re: Tiny030, yet another 68k SBC in 100mm x 100mm format

Plasmo wrote:
I'm working on a series of projects using Tiny030 pc board. I want to show how to build the board up in baby steps so it can be powered up and tested at each step. This way errors are easier to discover and fix. I have finished documenting stage 3. The project blog is here:
https://hackaday.io/project/164041-buil ... n-5-stages


Thanks very much for this! Off to order parts....

Author:  Plasmo [ Mon Mar 04, 2019 1:09 pm ]
Post subject:  Re: Tiny030, yet another 68k SBC in 100mm x 100mm format

You may want to take a look at the Instruction section of the Tiny030 project:
https://hackaday.io/project/164041/instructions

There are lots of manual wires in stage 2. It is meant to help me design a revised pc board. You are better off with stage 1 construction and testing, then jump to stage 3 assembly as described in the Instruction.
Bill

Author:  legacy [ Fri Aug 02, 2019 12:10 pm ]
Post subject:  Re: Tiny030, yet another 68k SBC in 100mm x 100mm format

sim30's are simple, you have { ras, cas }, while sim72-fp's looks more complex and I am a bit confused because in your schematic the module has { { RAS0 RAS1 RAS2 RAS3 } { CAS0 CAS1 CAS2 CAS3 } } but only { ras0 ras2 } are used, and connected together, while { ras1 ras3} are simply unconnected.

is there a clear and neat document about this?

Author:  legacy [ Fri Aug 02, 2019 1:13 pm ]
Post subject:  Re: Tiny030, yet another 68k SBC in 100mm x 100mm format

p.s.
which electronic CAD are you using for designing the PCB?

Author:  Plasmo [ Sat Aug 03, 2019 4:52 pm ]
Post subject:  Re: Tiny030, yet another 68k SBC in 100mm x 100mm format

There are documents on 72SIMM on Wikipedia. The assignment of RASx and CASx are unclear, so I just traced them out. If SIMM is singled-sided, only RAS0 (lower 16 bits) and RAS2 (upper 16 bits) are used. RAS1 and RAS3 are for the 2nd side of the doubled-sided SIMM card.

My schematic and pc board tools are obsolete, made by IVEX which was out of business in 2002-3. I used it for 20 years and familiar with most of their bugs and workarounds, so I keep on using them.
Bill

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