Hi ChickenMan,
Thanks for your very helpful reply. Here are some answers to your questions:
#1: The 16k model has 8 x 6116P-3 RAM chips. It does not have a 50-way or 34-way cable. From what you have said, I don't think any of my machines will work with the twin disk drive unit. I have just seen that it has WBE and WBF EPROMS. I seem to recall using Wordbee with this computer.
#2: I have now opened. I can see that it has 32k or RAM (6116P-3 x 16). It has BASICA and BASICB ROMS v5.22 as expected, and a third ROM C v1.10. Does that confirm that it is an IC? The expansion port is 50-way. It does not have a 50-way or 34-way cable either.
#3: The B-ETI serial terminal does have its top-cover badge, but it has some deposit on it, possibly the remnants of a plastic cover that was not peeled off for a long time. I have cleaned it up a little for the purpose of photography. I won't go any further with that until I am confident in proceeding in manner that does not damage the lettering, which is totally OK at this stage. I have taken a couple of photos, but I haven't figured out how to embed them in this post - please let me know how to do that.
#4: The very old unit has a blue coreboard. I have also taken some photos of that. I'm looking forward to being able to tell you the BASIC version!
Cheers,
Lew.
Hi someone,
Thanks to you also for your helpful reply.
It's good to know that you are also a ham, and thanks for your offer of help. I will send you a PM.
#4: Unfortunately the metal-based unit does not have any version numbers on its 4 BASIC EPROMS, which are labelled A, B, C and 250, in pencil, whatever that means. From the logo, think they are Hitachi chips. They have a white layer sandwiched between the top and the bottom. I guess that means that they are ceramic. I wouldn't call them purple, but I think they have a bluish tinge. I will post some photos when I know how.
I had read some of your posts, and I was wondering whether this model was designed for an AC supply. I have only tried it with DC so far. Would that stop it from working, or would it just compromise the serial output? I will check the voltage at the input of the voltage regulators.
I do have an old Oscilloscope with divide-by-ten probes, but it's certainly not a 60-100 MHz model. It's OK at 10 -20 MHz on the x10 time-base setting.
Cheers,
Lew.
Thanks for your very helpful reply. Here are some answers to your questions:
#1: The 16k model has 8 x 6116P-3 RAM chips. It does not have a 50-way or 34-way cable. From what you have said, I don't think any of my machines will work with the twin disk drive unit. I have just seen that it has WBE and WBF EPROMS. I seem to recall using Wordbee with this computer.
#2: I have now opened. I can see that it has 32k or RAM (6116P-3 x 16). It has BASICA and BASICB ROMS v5.22 as expected, and a third ROM C v1.10. Does that confirm that it is an IC? The expansion port is 50-way. It does not have a 50-way or 34-way cable either.
#3: The B-ETI serial terminal does have its top-cover badge, but it has some deposit on it, possibly the remnants of a plastic cover that was not peeled off for a long time. I have cleaned it up a little for the purpose of photography. I won't go any further with that until I am confident in proceeding in manner that does not damage the lettering, which is totally OK at this stage. I have taken a couple of photos, but I haven't figured out how to embed them in this post - please let me know how to do that.
#4: The very old unit has a blue coreboard. I have also taken some photos of that. I'm looking forward to being able to tell you the BASIC version!
Cheers,
Lew.
Hi someone,
Thanks to you also for your helpful reply.
It's good to know that you are also a ham, and thanks for your offer of help. I will send you a PM.
#4: Unfortunately the metal-based unit does not have any version numbers on its 4 BASIC EPROMS, which are labelled A, B, C and 250, in pencil, whatever that means. From the logo, think they are Hitachi chips. They have a white layer sandwiched between the top and the bottom. I guess that means that they are ceramic. I wouldn't call them purple, but I think they have a bluish tinge. I will post some photos when I know how.
I had read some of your posts, and I was wondering whether this model was designed for an AC supply. I have only tried it with DC so far. Would that stop it from working, or would it just compromise the serial output? I will check the voltage at the input of the voltage regulators.
I do have an old Oscilloscope with divide-by-ten probes, but it's certainly not a 60-100 MHz model. It's OK at 10 -20 MHz on the x10 time-base setting.
Cheers,
Lew.