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Re: General Stuff(tm)
Posted: 06 Jan 2024 17:42
by rubber_jonnie
stephen_usher wrote: 06 Jan 2024 17:15
One shift key has an issue with its dome. Good to know that ST ones work, not that I have any spare.
P.S. Just bought one from eBay.
I presume you mean a keyboard dome?
If you need any more I have a few, let me know and I'll post you some.
Re: General Stuff(tm)
Posted: 06 Jan 2024 20:24
by stephen_usher
rubber_jonnie wrote: 06 Jan 2024 17:42
I presume you mean a keyboard dome?
If you need any more I have a few, let me know and I'll post you some.
Yeah. I've ordered one from eBay for a fiver (along with a keycap). More would be useful though if you're offering, just in case. :-)
Re: General Stuff(tm)
Posted: 06 Jan 2024 20:27
by stephen_usher
Finally got around to opening up the Mega 2 ST I obtained a while ago.
From the date codes it looks like a relatively late mid-1990 machine and someone has already been inside and replaced one of the RAM chips. It'll just need sockets, decoupling caps and chips to bring it up to the full 4MB. No solder in the holes so it'd be easy.
Re: General Stuff(tm)
Posted: 06 Jan 2024 20:51
by rubber_jonnie
stephen_usher wrote: 06 Jan 2024 20:24
rubber_jonnie wrote: 06 Jan 2024 17:42
I presume you mean a keyboard dome?
If you need any more I have a few, let me know and I'll post you some.
Yeah. I've ordered one from eBay for a fiver (along with a keycap). More would be useful though if you're offering, just in case. :-)
Let me know how many you need, I have quite a few and key caps too if needed, just PM me.
Re: General Stuff(tm)
Posted: 09 Jan 2024 10:23
by stephen_usher
So, on to the next project, upgrading the Mega 2 ST to 4MB.
The 18 pin sockets arrive today, the RAM chips have been ordered from Exxos and I printed out a resistor leg bender tool last night so as to bend the legs of the decoupling caps to the right length. I should be able to get the soldering out of the way tonight and then just plug the chips in when they arrive.
Re: General Stuff(tm)
Posted: 09 Jan 2024 10:48
by HigashiJun
stephen_usher wrote: 09 Jan 2024 10:23
So, on to the next project, upgrading the Mega 2 ST to 4MB.
The 18 pin sockets arrive today, the RAM chips have been ordered from Exxos and I printed out a resistor leg bender tool last night so as to bend the legs of the decoupling caps to the right length. I should be able to get the soldering out of the way tonight and then just plug the chips in when they arrive.
That was a good upgrade to my Mega ST.
Really worth it.
Re: General Stuff(tm)
Posted: 09 Jan 2024 20:43
by stephen_usher
Sockets and decoupling caps installed and...
IMG_3531.jpeg
Nothing's broken! Yay! :-)
Re: General Stuff(tm)
Posted: 09 Jan 2024 21:58
by rubber_jonnie
stephen_usher wrote: 09 Jan 2024 20:43
Sockets and decoupling caps installed and...
IMG_3531.jpeg
Nothing's broken! Yay! :-)
Splendid :)
Re: General Stuff(tm)
Posted: 10 Jan 2024 12:12
by stephen_usher
Woo-hoo!
I now have the OPD disk interface ROM images!
Interestingly the image is a full 32K but the ROM socket in the schematic is only set up for 16K.
Re: General Stuff(tm)
Posted: 10 Jan 2024 19:06
by stephen_usher
Got home and quickly wrote the ROM image to an EEPROM, put it into the board, put the board into the ROM slot, connected a Gotek, switched on and...
IMG_3532.jpeg
IMG_3533.jpeg
It only goes and flippin' work first time!