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daver2's latest activity
daver2
replied to the thread
Tektronix 4010 restoration
.
Can you get at the bridge rectifiers? If so, I suspect you can reform the majority of these capacitors without removing them if that is...
25 minutes ago
daver2
replied to the thread
Intermittent CBM 8032 Power on Issue
.
>>> You could always check the CPU is being reset, but even if it wasn't, there should still be H & V drive pulses sent to the VDU. The...
Today at 12:56 AM
daver2
replied to the thread
Repair vs Preservation
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My personal view is to get it working for posterity - providing it is 'sympathetic' to the era. The original builder/owner would (I am...
Yesterday at 6:25 PM
daver2
replied to the thread
Osborne 1 resets itself continuously, but only when the keyboard is plugged in!
.
>>> See the above comment - only this machine exhibits this behavior, even after I swap between keyboards, which I think indicates the...
Yesterday at 5:03 PM
daver2
replied to the thread
Osborne 1 resets itself continuously, but only when the keyboard is plugged in!
.
You can also check the key matrix with a multimeter. The most likely cause of your issue is a shorted switch contact - so you are going...
Yesterday at 10:58 AM
daver2
replied to the thread
Vectrex blows internal fuse after time
.
Well, not the true datasheet for the 240RB4 - but the manual for rejuvenating the CRT. It identifies the heater voltage and the type of...
Thursday at 3:13 PM
daver2
replied to the thread
Keyboard Concepts - how to encode the keys outside of the ASCII sequence. What are the best ideas for CP/M?
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Of course, the Ctrl+Letter keys (depending upon where the conversion is actually done) translates into codes in the range 01-1F. 00...
Thursday at 12:52 PM
daver2
reacted to
gslick's post
in the thread
I decided to take a few steps back and decided to create a 80188 CPU computer instead
with
Like
.
No idea of you can find 80C186EB/80C188EB or 80C186EC/80C188EC chips...
Thursday at 9:18 AM
daver2
replied to the thread
I decided to take a few steps back and decided to create a 80188 CPU computer instead
.
I also can't find a serial interface on the 80188. I forgot about the 'enhanced' product line. Good spot there... Dave
Thursday at 9:08 AM
daver2
replied to the thread
I decided to take a few steps back and decided to create a 80188 CPU computer instead
.
Thanks. I never like things like DRQn inputs floating. I think they can be disabled in software anyhow (so shouldn't affect the...
Wednesday at 3:57 PM
daver2
replied to the thread
I decided to take a few steps back and decided to create a 80188 CPU computer instead
.
>>> So I need Resistors on the Output sides on the inverters? Got it! Or use a 74LS04 inverter instead - this device is not open...
Wednesday at 3:09 PM
daver2
replied to the thread
Data on Plessey 256KB Qbus memory card 705035
.
This is the closest information we have found at all on any QBUS Plessey memory cards...
Wednesday at 9:44 AM
daver2
replied to the thread
HP C1537 SCSI DDS3 tape drive on PDP11/73?
.
The UC07 card can either emulate the MSCP disk interface ***OR*** the TMSCP tape interface - but not both simultaneously. Therefore...
Wednesday at 9:34 AM
daver2
reacted to
Eudimorphodon's post
in the thread
I decided to take a few steps back and decided to create a 80188 CPU computer instead
with
Like
.
Yeah. If I were doing this I'd probably do one of these two things to interface the memory and skip the 8288: A: If I were *sure* I...
Wednesday at 7:08 AM
daver2
replied to the thread
HP C1537 SCSI DDS3 tape drive on PDP11/73?
.
I will have a look tomorrow. My stupid phone will not let me open files from bitsavers... Dave
Wednesday at 12:44 AM
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