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800_Rocks

Persistent RAM Cartridge?

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Persistent RAM

Intra-Tech Computer Products
 

Before I try this in my 800... Any idea what I have here?  What the two switches do?  Is it rare/valuable?

 

Edit:  Wait... I found this.  I should have searched first :-)  

 

Edited by 800_Rocks
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Interesting your label shows 1/2 instead of 8K/16K like mine, and the only other one previously pictured on the Internet.

 

I wonder if that means yours is a different or earlier version that switches between two 8K ROM "banks" instead of between a single 8K and 16K cartridge ROM space at once.

 

Care to share some hi-res pics of your internal PCB?

 

Do you know anything of it's previous ownership history, or where it came from geographically?

 

I believe my dad got the one in the linked thread you found from a friend (who was possibly the creator?) in the Vancouver BC (Canada) area, but haven't been able to contact the person he thinks he remembered from all those years ago...

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53F25D39-0E16-4233-B6B6-B44B0FE8FF69.thumb.jpeg.af41dd2e01b2bcd467dec651a4c25e04.jpeg799FB95F-6DCC-4830-A66A-64FF5771879C.thumb.jpeg.e74c62cef54ea16bbe59bf6ce0210599.jpeg1FAC16DC-28D8-4203-B015-5874B6708DF4.thumb.jpeg.b988dd23c195c0fe1516f3308c64c1bf.jpeg80038A2A-05C3-46E4-9CF3-755D51D0CDAE.thumb.jpeg.badee8761d6774370b3455dd0251a003.jpeg

 

I got this in an online auction of 27 carts.  This one caught my eye.  Sorry I have no history on it.

Edited by 800_Rocks
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17 minutes ago, 800_Rocks said:

Sorry I have no history on it.

Wonder if anything might be gleaned by asking the seller?

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image.thumb.png.5d32d61ee2d5cea36f1f41dc78face45.png

 

800_Rocks,

 

   I have a question to ask.  If you have the time......?

 

   On this side of the pcb.  The inside slide switch.  The trace coming from the end of the 74LS04 chip does it go to anyone of the 3 pins or is the trace cut?

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image.thumb.png.5e3441c6f153b225fcbc3f0e93590a77.png

 

Check the battery.  The lower left hand 'corner'.  Is that white residue?  If it is,  then the battery will need to be desoldered, the area cleaned and an new battery soldered in. 

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On 11/15/2019 at 7:05 AM, Dropcheck said:

image.thumb.png.5d32d61ee2d5cea36f1f41dc78face45.png

 

800_Rocks,

 

   I have a question to ask.  If you have the time......?

 

   On this side of the pcb.  The inside slide switch.  The trace coming from the end of the 74LS04 chip does it go to anyone of the 3 pins or is the trace cut?

Does this angle help?

 

B5670DF3-9AAC-42DD-91B7-F0B610244AC5.jpeg

Edited by 800_Rocks

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