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Hi Alison,Hi Nicola -- That looks FANTASTIC! woohoo!
I took a quick look on ebay -- 18 pin dip 1m dram looks to be pretty rare -- mostly one-offs. If you find a listing you think good (what speed are you looking for -- slowest I saw in a quick scan was 100ns) I'm happy to contribute funds to the project in order to purchase -- I can send to you via paypal. Going forward, if the 1mbit dips prove to be unobtainable, what do you think? SMT chips?
Best, Alison
Hi Nicola -- OK sounds good! I see them on UTSource.Hi Alison,
thanks but funding is not necessary
No worry, UTsource have a huge stock of misc brand of 1Mbit mem.
I found the Hitachi HM511000AP-8 at $0.96 for each. You just need a little patience for shipping from China
I will publish everything for free under CC license when I have tested the board.looks incredible. I have got to build one of these. If anyone is buying Pcbs can they sell me one?
Also https://github.com/na103/rambow unless I am typing it incorrectly its not working for me
It good to get a small status update about the on going development progress on this board.
YA, I could use a couple as well.looks incredible. I have got to build one of these. If anyone is buying Pcbs can they sell me one?
Also https://github.com/na103/rambow unless I am typing it incorrectly its not working for me
Ya, I also tried the above web link on May 28 at 3:30 pm and had no luck with it either.I will publish everything for free under CC license when I have tested the board.
I've already seen that there are things on the pcb that I need to fix.
Anyway, thanks for your interest and fingers crossed
yes i used the HM511000 DRAM buy from utsource.WOOOOO HOOOOO!!! You're a genius! That's so fabulous!
Did you end up using the 1mbit chips from UTSource? If so, I will go ahead and order some in preparation
Would it be worth investigating the procedure to update the 100A to be able to use 100B roms? (yet another daughterboard I think, can't recall offhand)? would that be an approach? Or do you think we're either a) fine, or b) we'll want to tweak the ROM code?
Best, A
I correct myself, the message of incorrect size of memory is given with the original rainbow diagnostic software.any suggestion to test the whole memory area? the rainbow diagnostic software seems not to work correctly.
maybe a bios A limitation that does not recognize the memory correctly ?
See NA 103 message from Today at 7:36 AMgood news!
it seems to works
any suggestion to test the whole memory area? the rainbow diagnostic software seems not to work correctly.
maybe a bios A limitation that does not recognize the memory correctly ?
View attachment 1281586View attachment 1281587
Ya it is not really a problem, unless you get some bad chips. Then it could be a issue to diagnose the faulty chip (or chips).yes i used the HM511000 DRAM buy from utsource.
i don't know of a mod that allows to use the roms (different in size and number) of the model B on A, probably a patch would be a auspicable solution.
at startup the 100A doesn't give any error, the bios system test is ok.
the only problem seems to be with the t. Is not possible to do 8088 memory test because it reports anrainbow diagnostic software.
in fact the 100A supports a maximum of 256kb with the option memory for 100A or 832kb with the adapter and option memory B.
in this case the RAMbow reaches 896kb.
anyway I think this is a non-problem if the operating system recognizes all the memory.