hp110+ info

[Jay West]

Tony wrote....
>> Do you have any other ROMs in the 'H' sockets? If not, it's possible you
>> have a bad buffer chip or something.
I do, but it is only the two rom sets that use the H sockets that are not 
appearing in the PAM list. The roms that do appear, are only using the low 
sockets. I think that's not a coincidence.

> Specifically U5 (74HC245) on the ROM drawer PCB.
Octal Bus Transceiver... I guess there are two of them, one for the lower 8 
and the one at U5 must be for the upper 8? I am not familiar with that chip. 
Is there a relatively easy way to test it before just replacing it?

Unrelated: I wanted to try the H/L pair chips in a different socket. I chose 
to remove the BASIC chip and try that one. Upon removal, I noticed the BASIC 
chip had a bent pin. I figured whoever put it in must not have paid close 
attention. I put a H/L set (Lotus) in there to check it, and noticed that it 
bent the same pin on the L chip of the Lotus set. Argh! So I removed the 
chip and under inspection under a magnifier, I can see that the 
corresponding hole in the boards "socket" was fouled with something, causing 
any chip put in there to get that pin pushed up and bent. Yikes. Very 
careful work under the magnifier cleared the obstruction. I straightened the 
pin on the BASIC chip and put it back in and it went in fine (and works 
fine). However, soon as I touched the pin on the L Lotus chip, it broke off 
(right where the pin becomes narrow). So, I get to try and carefully 
reattach that pin leg to the chip. Can anyone share broken chip leg repair 
techniques? I can't attach a tiny segment of wire as a brace - the "socket" 
on the board is the type where each pin gets it's own socket so a thicker 
leg probably won't go in.

Jay West