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Model 1 26-1001 "D" - What's the D?

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Hey all,

I picked up an early M1 designated as 26-1001 D. I have had no luck trying to figure out what the D suffix indicates? Anyone have a clue?

Cary
 
The revision of the board. The D revision is probably the most popular and incorporates many fixes learned by Tandy along the way.
 
Ah, ok. Thanks Pete. It looks like an official RS sticker was placed over the original catalog number designating a D board as pictured here. I am guessing this was done prior to leaving Fort Worth, unless users could bring their original computers in for an upgrade.
RS.jpg
 
D boards were sold from early 1978 to mid 79 and usually came with the keybounce keyboard as shown in the auction listing you are referring to.

The are the first large scale production after initial problems were solved though they do have a restriction that they will only support a Level II satellite board. Also on these D boards a modification (XRX-III) needs to be done so Level II cassette reads are easier.

For a short time they released a few thousand E boards, then the G board was the next big volume seller. In contrast to Pski I think they sold more G boards than D boards but there is no actual way to confirm this. G boards came with an ALPS keyboard, and Level II Basic now fitted on two Eproms so the satellite Level II board was no longer needed. They fixed some bugs in Level II Basic at this time so now the XRX-III mod was not needed for reliable cassette operation.

However to put all this into perspective, with regards to the motherboards, they are all the same save for a few different routings related to the Rom selection, the rest is exactly the same.

Just my 2c worth.
 
My 16k Level II machine with keypad is has a -1 suffix added to the catalog number with a separate little sticker. The board appears to be marked as rev. G, but the system has a daughterboard for the Level II.

IMG_1524.jpg IMG_1523.jpg IMG_1522.jpg IMG_1525.jpg IMG_1526.jpg IMG_1527.jpg IMG_1528.jpg IMG_1530.jpg
 
NF6X said:
My 16k Level II machine with keypad is has a -1 suffix added to the catalog number with a separate little sticker. The board appears to be marked as rev. G, but the system has a daughterboard for the Level II.
Click to expand...

That's interesting. From the different catalog numbers I gathered years ago I always thought the 26-1006-1 was for the 16k Level II without keypad
 
26-001/2/3/4/5/6/8 are the models and the D indicates a submodel. You can also see it's more complex model revs and features as they appeared in the catalogs.

The 1001 was the first one, not the most common. The rarest is the 26-1008.

http://oldcomputers.net/trs80i.html
http://www.cchaven.com/MODELI.HTML (CCHAVEN's site!)

I have the 26-1008 which is not listed on either of these sites.

I am kind of a closet Model 1 aficionado, I made a pretty nice exhibit for VCF East 4 about 12 years ago.
http://www.vintagecomputer.net/vcf4/trs80/TRS80_30th.jpg
and another at the University of Delaware:
http://www.vintagecomputer.net/UofDelaware/UofDelaware_CM_TRS80-2.JPG

I still use my stringy floppy drive, I restored the drive belt, the hardest part to getting them running after so many years. If anyone is interested I can fire up the 1008, it was never supposed to have been sold, that old story. Like the Commodore P500 a few got out. I think at this point the RF police was let this one live.
Bill
 
billdeg said:
26-001/2/3/4/5/6/8 are the models and the D indicates a submodel. You can also see it's more complex model revs and features as they appeared in the catalogs.

The 1001 was the first one, not the most common. The rarest is the 26-1008.

http://oldcomputers.net/trs80i.html
http://www.cchaven.com/MODELI.HTML (CCHAVEN's site!)

I have the 26-1008 which is not listed on either of these sites.

I am kind of a closet Model 1 aficionado, I made a pretty nice exhibit for VCF East 4 about 12 years ago.
http://www.vintagecomputer.net/vcf4/trs80/TRS80_30th.jpg
and another at the University of Delaware:
http://www.vintagecomputer.net/UofDelaware/UofDelaware_CM_TRS80-2.JPG

I still use my stringy floppy drive, I restored the drive belt, the hardest part to getting them running after so many years. If anyone is interested I can fire up the 1008, it was never supposed to have been sold, that old story. Like the Commodore P500 a few got out. I think at this point the RF police was let this one live.
Bill
Click to expand...

Do you have pictures of the board in the 26-1008?
 
As I understand it, the 26-1008 was the TRS 80 1 that the FCC pulled from stores due to RF interference problems, as they were no longer legally allowed to sell the Model 1 as it was, due to new regulations. Radio Shack put out the Model III as a result. A few 26-1008's got out as demo units or a pre-mass-production run, but they were never officially distributed as I understand it. Probably execs and a few store owners got them, like the Commodore P500. 26-1008 was never in the Radio Shack catalog, to my knowledge.

So, if you have one, consider it very rare. Aside from mine, which is serial number 38, there is someone here on this board who has/had one.

In my opinion the 26-1006D is the most common. 26-1007 was controller card I think.

http://www.vintagecomputer.net/browse_thread.cfm?id=727
thm_26-1008_sn000038.jpg


This unit has never been opened, so I have not checked the motherboard. I read somewhere that a 26-1008 had MOS chips. Unless there is a compelling reason I believe its best to preserve the seal, so I don't void the warranty.

Bill
 
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billdeg said:
As I understand it, the 26-1008 was the TRS 80 1 that the FCC pulled from stores due to RF interference problems, as they were no longer legally allowed to sell the Model 1 as it was, due to new regulations. Radio Shack put out the Model III as a result. A few 26-1008's got out as demo units or a pre-mass-production run, but they were never officially distributed as I understand it. Probably execs and a few store owners got them, like the Commodore P500. 26-1008 was never in the Radio Shack catalog, to my knowledge.

So, if you have one, consider it very rare. Aside from mine, which is serial number 38, there is someone here on this board who has/had one.

In my opinion the 26-1006D is the most common. 26-1007 was controller card I think.

http://www.vintagecomputer.net/browse_thread.cfm?id=727
thm_26-1008_sn000038.jpg


This unit has never been opened, so I have not checked the motherboard. I read somewhere that a 26-1008 had MOS chips. Unless there is a compelling reason I believe its best to preserve the seal, so I don't void the warranty.

Bill
Click to expand...

Interesting that it doesn't have the updated ROMs. Can you get a picture of the bottom to see if the ROM daughterboard cable can be seen?
 
There is no ROM daughterboard (or any visible flat cable) in the 26-1008. I have a 26-1006 that does have a visible cable for comparison. How can you tell that the ROM is not updated? Just from the printmem command? Would not the latest ROMs be installed just because it's the newer model? Maybe no add-on board would be needed. Please educate me on the subject..
 
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