ROM 1.0 at last !
Congrats !
The other dumping way is unsoldering the ROM and connect it to an EPROM programmer.
I've already done this with a TI-80 using an LH5359 ROM.
Many TI-81 starting from version 1.1 also use that same ROM.
The problem is that this version 1.0 TI-81 ROM is currectly unindentified, as we can only see the "(c)1990 TI" sticker.
(same problem with the Datamath 1.0 TI-81)Can you check if something's written on the ROM chip under the sticker ?
If not, we could just pray that this ROM chip is pin-compatible with the LH5359 ROM... checking the PCB circuits and comparing them with PCB 1.1 may help us figuring it out.
And it would be wise to get a 2nd TI-81 1.0 before attempting such potentially destructive dumpings.