Great Hierophant
Veteran Member
If you take a look at all the Tandy 1000 models, you see that there are some model numbers very close to each other :
The differences between the 1000 and 1000A are entirely internal with some obvious ones, the latter has a socket for a math coprocessor, and some not so obvious, technical issues fixed and newer BIOS rom that scans for ROM extensions on expansion cards (bootable hard disks!). The 1000HD probably looks identical to the 1000/1000A on the front except that one of the bays has an LED instead of a filler faceplate. Tandy would increment hard drive models by 1 for the RL, RLX and RSX. The RLX has DOS 3.3 in ROM while the RLX "B" models have DOS 5.0 in ROM. For the SX, the 25-1051 designated a two drive floppy system while the 1052 designated a one drive floppy system.
As far as the 25-1054 goes, there does not seem to be anything specific to this model that would set it apart from the other 1000SXes. There is no indication that that a RAM or hard drive upgrade is part of this model, and it seems it has 2x360KB drives. Does anyone have more information? Could this be the mythical AX, a rebranded SX which was sold in non-Radio Shack stores (Wal-Mart I believe.)
Code:
Computer Catalog Number
1000 25-1000
1000A 25-1000A
1000HD 25-1001
1000EX 25-1050
1000HX 25-1053
1000RL 25-1450
1000RL-HD 25-1451
1000RLX 25-1452
1000RLX 25-1453B
1000RLX-HD 25-1453
1000RLX-HD 25-1453B
1000RSX 25-1455
1000RSX-HD 25-1454
1000SL 25-1401
1000SL/2 25-1402
1000SX 25-1051
1000SX 25-1052
1000SX 25-1054
1000TL 25-1601
1000TL/2 25-1602
1000TL/3 25-1603
1000TX 25-1600
The differences between the 1000 and 1000A are entirely internal with some obvious ones, the latter has a socket for a math coprocessor, and some not so obvious, technical issues fixed and newer BIOS rom that scans for ROM extensions on expansion cards (bootable hard disks!). The 1000HD probably looks identical to the 1000/1000A on the front except that one of the bays has an LED instead of a filler faceplate. Tandy would increment hard drive models by 1 for the RL, RLX and RSX. The RLX has DOS 3.3 in ROM while the RLX "B" models have DOS 5.0 in ROM. For the SX, the 25-1051 designated a two drive floppy system while the 1052 designated a one drive floppy system.
As far as the 25-1054 goes, there does not seem to be anything specific to this model that would set it apart from the other 1000SXes. There is no indication that that a RAM or hard drive upgrade is part of this model, and it seems it has 2x360KB drives. Does anyone have more information? Could this be the mythical AX, a rebranded SX which was sold in non-Radio Shack stores (Wal-Mart I believe.)
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