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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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 Posted: Tue May 04, 2010 2:30 am Post subject: Memory for a Tandy 1500HD laptop |
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It is unusual in that it has 35 pins in a low-profile format (such as the 3-chip 30-pins)...
It only uses one for 1Mb but Id like to find one if possible.
ANY help/sources would be appreciated!
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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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| Posted: Tue May 04, 2010 5:11 pm Post subject: |
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I have many old 30-pin memory sticks, but I'd have to check to see if I have your special specs.
By chance, do you have a pic of it?
BTW, I posted about my Tandy 1500 on your blog recently! 
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Chiefish
Joined: 23 Sep 2007
Posts: 2153
Location: Northwest N.J. U.S.A
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| Posted: Tue May 04, 2010 6:21 pm Post subject: |
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I also have a large box of memory that I have laying around that has all sorts of old memory in it, if I saw a sample I would be more than happy to dig thru it and see if I have anything you could use. 
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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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| Posted: Wed May 05, 2010 12:23 am Post subject: |
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Unfortunately I do NOT have a pic as I dont have one... I only know that it has 35 pins as opposed to the standard 30 (because I counted them when the 30-pin simms I bought didnt fit!  ),
and
It is a 'low-profile' type like the 30-pin 3-chip pieces that have the chips lying end-2-end rather then 8 or 9 that are side-by-side.
I could get you a pic of the 30-pin low-profile type... if that would help! |
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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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| Posted: Wed May 05, 2010 12:40 am Post subject: |
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Darn- I have 2 dozen 30 pin 1 MB memory sticks, but no 34 or 35 pin ones 
These must be special or proprietary memory's.
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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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| Posted: Wed May 05, 2010 12:44 am Post subject: |
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Yeah... that' the truth!
IF you happen to have/find the service manual or schematics for that 1500, PLEASE OH PLEASE let me know!
made an entry in your HD thread too... |
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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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| Posted: Wed May 05, 2010 12:59 am Post subject: |
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| leeb wrote: | Yeah... that' the truth!
IF you happen to have/find the service manual or schematics for that 1500, PLEASE OH PLEASE let me know!
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I have the original "Owners Guide" for the 1500 and regarding memory adding, it says: "...Use only the specified EMS RAM card (cat. no. 25-3507) with your computer."
"Install the temm1500.sys file device driver. Use the MS-DOS Edlin command or some other text editor to place the following line in the config.sys file. <device=c:\dos\temm1500.sys>"
NO schematics included.
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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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| Posted: Wed May 05, 2010 1:01 am Post subject: |
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I dont have the temm1500.sys file, but I dont have the ram stick yet either...
At least the 1500 is up and running again! |
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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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| Posted: Wed May 05, 2010 1:13 am Post subject: |
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| leeb wrote: | I dont have the temm1500.sys file, but I dont have the ram stick yet either...
At least the 1500 is up and running again! |
Nice!
How did you get it running?? I thought you were stuck for a part. 
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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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| Posted: Wed May 05, 2010 1:15 am Post subject: |
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Havent checked the blog recently?
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Tetrium
Joined: 25 Apr 2010
Posts: 466
Location: The Netherlands
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| Posted: Wed May 05, 2010 4:56 am Post subject: |
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| You mean your blog on Vintage-Computer.com? Not everybody from here reads that |
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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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| Posted: Wed May 05, 2010 7:10 pm Post subject: |
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True... but I thought HE did/does...
my bad!  |
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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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| Posted: Wed May 05, 2010 7:21 pm Post subject: |
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| leeb wrote: | True... but I thought HE did/does...
my bad! |
I haven't checked the latest post, sorry. 
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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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| Posted: Mon May 17, 2010 2:32 am Post subject: Well, since nobody's got any... |
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I am attempting to 'build my own'.
The schematics I was able to get for the 2810hd show the same 35-pin arrangement (I am certain... kinda) as the 1500, BUT HAS the pinouts too!
I have already designed a board based on the 424260 DRAM ic, and if I havent made it too 'big/small/wrong/etc' I MIGHT have a prototype ready someday soon!
Will keep in touch! |
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leeb
Joined: 03 May 2010
Posts: 17
Location: Palm Springs CA
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| Posted: Thu May 20, 2010 2:38 pm Post subject: 42460 is OUT |
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Why? ... mainly because the board is too small to handle the pins!
Looking to work with the 4c4001s that are on the 30-pin board, but Im not sure I can work with the 9th address line without using only 1/2 of the chip(s)... putting 4 chips on the boards (which worked, btw).
Would like to go with the 3-chip setup... 2 memories and 1 quad XNOR...
Like I was gonna do originally. |
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