"ADDCARD" as advertised in PCM and 80-Micro by Discount Computer Supplies 
looks to be exactly what we original T1K(A)'ers need to expand our lowly three 
slot machines... 
    The board (costing $99 not $79 as advertised on one of the mentioned 
magazines) is a little over 3.5 x 8.5 inches and simply plugs into "the slot 
nearest the disk drives" once you have mounted all the 8" or shorter boards on 
the ADDCARD board. It also mentions in the instructions that you may, (read 
that have to) remove the metal tab mount from the card before inserting it into 
the ADDCARD board.  The slots on the board are spaced 0.75" inches apart, 
providing for a tight fit for some boards. 
    My first problem was trying to mount a stock Tandy RS232 card onto the ADD-
A-SLOT board. After removing the metal tab, plugging in the board, and 
"eyeballing" the fit into my stock 1000HD, i noted the metal cage around the 
fan and the power supply (something lacking from my early 1000) butted right up 
against the 25pin connector for the RS232 card eliminating the possibility of 
plugging a cable onto it.
    The second problem was the major one with me. After mounting the hard drive 
controller card onto the ADDCARD board, and plugging it in. My T1000HD failed 
to recognize the hard drive no matter the slot used on the ADDCARD board. 
Granted the controller card could be moved to the middle slot, but it would be 
necessary to make (or have made) special cables rerouting around the ADDCARD 
board which has to reside in the slot closest to the disk drive(s). 
    It was at this point that I packed up the ADDCARD board and am returning 
it to the distributor. 
    My impression of the board itself is it's pricey. For $99+ you're getting 
little more than a piece of circuit board with 4 female and 1 male connector, a 
metal tab (incidentally not compatible with the T1K's back mount), and a very 
simple trace pattern connecting the connectors.
    T1000HD owners also note the placement of your hard drive makes the lowest 
slot on the board unusable unless you have a VERY-short board to install. 
    The board probably performs quite well as long as you have cards to install 
on it that fit the parameters of the space you have available. I just gave up 
on both ADDCARD and this review when I found the my stock Tandy hard drive 
controller card would not work when installed in ADDCARD.