Thread
ROM_SIMM_Connector_Retrofittin' =8-D
Like the title says: retrofitting a ROM SIMM Slot Connector to thru-holes left unpopulated by Apple during manufacture will be the next big thing! :lol:
I was surprised to discover this (assumpion) early production MoBo in my more recently acquired Quadra 605, henceforth to be referred to as Q605x.
How many more of these boards do we have in the inventory, comrades?
I'll have to take MUCH better pics, locating where Apple placed a select/deselect option for the ROM SIMM is next on the list.
The header at J18 is for 605/475 Gestalt ID selection, correct?
"Stock" MoBo:
< more pics to come >
Methinks that my original Quadra 630 restoration project will be getting the first Connector_Refit.
I was surprised to discover this (assumpion) early production MoBo in my more recently acquired Quadra 605, henceforth to be referred to as Q605x.
How many more of these boards do we have in the inventory, comrades?
I'll have to take MUCH better pics, locating where Apple placed a select/deselect option for the ROM SIMM is next on the list.
The header at J18 is for 605/475 Gestalt ID selection, correct?
"Stock" MoBo:
< more pics to come >
Methinks that my original Quadra 630 restoration project will be getting the first Connector_Refit.
The Quadra 700 automatically detects whether ROM SIMM is installed or not. I would guess it uses one of the ground pins to detect it or something. It's possible that the newer Macs don't need the jumper.
The Quadra 840av has these ROM SIMM pads too. I have a Quadra 840av ROM SIMM and unfortunately its pinout is slightly different so it won't work with my SIMM -- the 840av's motherboard presumably supplies 5V on the ROM SIMM chip select pin which would deactivate it. (It must because 840av ROM SIMM has the chip select pin tied directly to 5V). Probably wouldn't hurt anything but the chips wouldn't respond correctly without a hack done to the SIMM.
The Quadra 840av has these ROM SIMM pads too. I have a Quadra 840av ROM SIMM and unfortunately its pinout is slightly different so it won't work with my SIMM -- the 840av's motherboard presumably supplies 5V on the ROM SIMM chip select pin which would deactivate it. (It must because 840av ROM SIMM has the chip select pin tied directly to 5V). Probably wouldn't hurt anything but the chips wouldn't respond correctly without a hack done to the SIMM.
That's good news, can't wait to give it a whirl to see if that's the way it works for the 605/475.
I've been reassembling and putting away someting on the order of 11.375 MicroQuadras, Duos, PowerBooks and the odd, eviscerated Mac Plus . . .
. . . very odd, I'll be posting pics of that one real soon now! [
] ]'>
Ahyhoot, it seems like the Q605x may actually have been an LC475x (note the missing jumper block on J-18) machs nix . . .
. . . it's now officially the Q605x . . . because it just sounds . . .
. . . and will be interposed between the RAM/Heat Sunk 68040 and bottom plastics of the the DOA MicroQuadraFeetsMac#1 before the week is out.
Heh!
)
edit: I just reassembled and tested the Q605x, everything is hunky-dory!
I've been reassembling and putting away someting on the order of 11.375 MicroQuadras, Duos, PowerBooks and the odd, eviscerated Mac Plus . . .
. . . very odd, I'll be posting pics of that one real soon now! [
] ]'>Ahyhoot, it seems like the Q605x may actually have been an LC475x (note the missing jumper block on J-18) machs nix . . .
. . . it's now officially the Q605x . . . because it just sounds
. . .. . . and will be interposed between the RAM/Heat Sunk 68040 and bottom plastics of the the DOA MicroQuadraFeetsMac#1 before the week is out.
Heh!
) edit: I just reassembled and tested the Q605x, everything is hunky-dory!
Mines got the pads on it-no socket. Also, you're right that the jumper's for the Q605/P475 selection. (I've always wondered what those pads were for-I thought it was so that you could add an extra RAM bank.) It's odd that yours as got the socket on it...
mcdermd is in the middle of scrounging around for dead boards with a ROM SIMM slot he can scavenge, He is looking to desolder this ROM SIMM and then Solder it on a LC475,
for some really cool testing!
So my question is:
Will a SE/30 Romm Simm Slot work on the LC475?
I would assume the Rom Simm slot was standardized?
Here is a picture of a q605 and IIsi together,looks like it should work...
for some really cool testing!
So my question is:
Will a SE/30 Romm Simm Slot work on the LC475?
I would assume the Rom Simm slot was standardized?
Here is a picture of a q605 and IIsi together,looks like it should work...
Same slot, same SIMM, but you'll need to tweak the Quadra's ROM image, AFAIK. Check the DevNotes for the signals/pinouts for confirmation.
Dunno about the drivers for accessing the additional ROMdisk space.
Dr. Braun is your man.
Dunno about the drivers for accessing the additional ROMdisk space.
Dr. Braun is your man.
I've got it fitted. Nothing to test with but it's available now.
you are the man!
That makes two ROM SIMM enhanced MicroQuadras available for flight testing.
How easy/hard was it to scavenge that connector off the DOA board?
DQ, do you need a MicroQuadra to borrow for to to give this a spin? :?:
olePigeon, is there any chance you might be able to round up some more of those SIMM Sockets?
How easy/hard was it to scavenge that connector off the DOA board?
DQ, do you need a MicroQuadra to borrow for to to give this a spin? :?:
olePigeon, is there any chance you might be able to round up some more of those SIMM Sockets?
Nice work guys!
Unfortunately, according to bbraun's testing, it's looking like 040 Macs won't support addressing ROM bigger than 1 MB in size -- at least in the Quadra 650 or the Quadra 700. It appears to be a limitation in the actual ASICs on the logic board :-( That pretty much eliminates the possibility of a ROM disk on these models. You could still use a custom ROM to change the startup chime though...
Unfortunately, according to bbraun's testing, it's looking like 040 Macs won't support addressing ROM bigger than 1 MB in size -- at least in the Quadra 650 or the Quadra 700. It appears to be a limitation in the actual ASICs on the logic board :-( That pretty much eliminates the possibility of a ROM disk on these models. You could still use a custom ROM to change the startup chime though...
Quick and easy with this:
It must have been under 5 minutes to get it out. I cleared the unpopulated holes on the 475 board with a traditional sucker, though. That took a while longer.
That is a *great* tool. Same thing I used to initially add sockets for my IIci's DIP ROMs Well worth the cost especially if you do a lot of soldering.
Well worth the cost especially if you do a lot of soldering.
That makes sense, FDD only was a thing of the distant past and HDDs were plenty big enough that ROM Disk was silly by that time.
Custom chimes and imagesw for startup on the small ROM SIMMS would be a good way to chew through your small ROM SIMM inventory though! :approve:
Custom chimes and imagesw for startup on the small ROM SIMMS would be a good way to chew through your small ROM SIMM inventory though! :approve:
Been looking for one of those vacuum desoldering irons for a looong time. Never found one.
I have an El-Cheapo version.
It mostly works
It mostly works
Couldn't you take the rubber bulb off that and attach a dust-buster size vacuum?
those bulb irons SUCK.
They really really do, even if you attached a vacuum pump they just dont have enough heating power....
They really really do, even if you attached a vacuum pump they just dont have enough heating power....
Agreed. they have driven me nuts.
I love the play on words. 
I've got one that looks similar to this.
IIRC, mine cost something like $30 or $40 from Jameco back in 1989-90. I need to put a new tip on it again, but it has worked fairly well for a long time.
That snazzy continuous duty vacuum pump unit looks like it'd be a lot better, especially for removing EuroDin PDS Connectors.
edit: Yep, Jameco is listing it as a new product.
I've got one that looks similar to this.
IIRC, mine cost something like $30 or $40 from Jameco back in 1989-90. I need to put a new tip on it again, but it has worked fairly well for a long time.
That snazzy continuous duty vacuum pump unit looks like it'd be a lot better, especially for removing EuroDin PDS Connectors.
edit: Yep, Jameco is listing it as a new product.
i could see how attaching a vacuum pump would cause it to no get hot enough,
maybe a vacuum pump with a mechanical push button valve...
I bought it when i was replacing laptop power plugs, i used it about 8 times, it worked fine for that purpose.
I also replaced a bad usb port on my friends motherboard, it worked fine for that as well.
Its got plenty of heat, you do have to flux, you flux right?
My beef with is is cleaning it, kinda annoying.
Would i do a rom simm with this? na, nor would I use this as a production tool.
non of my tools are production tools.
heck techknight, you even have a hot air station, and the ability to get various masks to re bga chips...
again something i will never attempt to own, why would i when i can just pay you 30 bucks, for an occasional re-work.
it all depends on what you are doing.
maybe a vacuum pump with a mechanical push button valve...
I bought it when i was replacing laptop power plugs, i used it about 8 times, it worked fine for that purpose.
I also replaced a bad usb port on my friends motherboard, it worked fine for that as well.
Its got plenty of heat, you do have to flux, you flux right?
My beef with is is cleaning it, kinda annoying.
Would i do a rom simm with this? na, nor would I use this as a production tool.
non of my tools are production tools.
heck techknight, you even have a hot air station, and the ability to get various masks to re bga chips...
again something i will never attempt to own, why would i when i can just pay you 30 bucks, for an occasional re-work.
it all depends on what you are doing.
When the time comes, after I've chopped down the three wire wrap connectors for the IIsi PDS, how about I send the MoBo to you for removal of the soldertail connector PDS slot and you install the modded wire wrap jobs for me?
Maybe I'll have you recap it at the same time . . . I'm lazy and just terrible at soldering . . . :I
Sure. PM me.
I have a Hakko 808 just like that one. Prior to getting it I used one of those suction bulb irons for years. I thought the suction bulb iron worked fine, but after using the 808 I could never go back. The difference is night and day, it's a beat up moped vs a Rolls-Royce. I cringed a bit when I dropped the 200 bucks on the 808 but I never regretted it for a moment.
I can just get by with mine and the nail nippers! }
xx(
Well, tell me if you'd like someone to move the iron for you. I rather enjoy it at times.
Eek! You know, careful application of a heat gun combined with some aluminum foil shielding to protect areas you don't wish to heat can do a nice job of removing a big connector like that intact. Just practice on some junk boards first so you can get the hang of melting the solder without warping, blistering or burning the board.
Works well to salvage parts quickly from junk PCBs too. Heat up the board until the solder starts to melt, then give it a good whack and most of the parts will just fall right off.
Yup, bake-n-shake works. That board cost me something like $5 and I was practicing to do meatball surgery on $7 boards. }
With the vast majority of the pins loose from the solder sucker, the nail nipper's pressure across the width of the connector didn't put much tension on the recalcitrant Pin-PCB Solder Joints. I'd never use the nipper parallel to the board, only perpendicular to it for crushing the connector from the sides . . .
. . . unless it really aggravated me! }
With the vast majority of the pins loose from the solder sucker, the nail nipper's pressure across the width of the connector didn't put much tension on the recalcitrant Pin-PCB Solder Joints. I'd never use the nipper parallel to the board, only perpendicular to it for crushing the connector from the sides . . .
. . . unless it really aggravated me! }