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jonathanjo's latest activity
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jonathanjo reacted to peclark's post in the thread PDP11/23 Project Completed (at least for now) with
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I recently completed some long overdue upgrades to my Micro-PDP11/23, and thought I would share them here. I got this machine about 20... -
jonathanjo replied to the thread DEC units on ebay.Good-looking PDP11/34a CPU and control boards as a DEC Spares Set They're in the UK and ending today...
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jonathanjo reacted to AK6DN's post in the thread Memory failure modes and RAM test patterns with Like.
"Extended March C-" is what I based the test strategy of my MEMX memory diagnostic on. In the attached pdf, see pp. 48-53 for a...
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jonathanjo reacted to daver2's post in the thread Memory failure modes and RAM test patterns with Like.
The MARCH-C memory test is pretty good for detecting DRAM faults. There are various documents covering the failure modes for this test...
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The cooling fans on my Micro PDP11/23 were wearing out - the bearings in one were failing and the fan would no longer spin, and the...
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Hello Friends I've been reading about memory failure modes, especially for dynamic RAM, and wanted to hear from people about what...
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Some months back, someone on reddit needed assistance recovering data from an RT-11 RL02 cartridge they had accidentally clobbered. I...
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I use a simple TP-Link range expander on several of my rack-mounted rigs. Cheap, just connect with a patch cable.
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I don't know if Solaris 2.6 or 2.7 ever supported WiFi, but even if they did, you'd be out of luck with modern encryption standards...
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jonathanjo replied to the thread More storage treasure: KDJ11-D/S (PDP11/53?) in H9275A cage with analogue, async, SCSI, ether.I really don't want to take out 54 RAM chips and find actually it's something else, so while I'm waiting for some replacement RAM chips...
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jonathanjo reacted to Harm's post in the thread Who bought my VT-100 and is missing a key? with Like.
Hi all! I'm afraid I will be one of those post-once-never-return-users. But it's for a good cause, hear me out. A couple of months...
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jonathanjo replied to the thread DRAM refresh on KDJ11-DS.Answer appears to be: RAS-only. With system in memory error (or halted in ODT prompt) I'm seeing a 200 ns /RAS every 14.67 us, /CAS...
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Hi Friends For context: I'm working on getting a PDP11/53 running: starting with the basic KDJ11-DS CPU board (main thread). As I'm...
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jonathanjo replied to the thread More storage treasure: KDJ11-D/S (PDP11/53?) in H9275A cage with analogue, async, SCSI, ether.Update: I tried a few things without any change: Checked voltage at the board, was dropping almost 0.5V so changed PSU, good 5V...
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jonathanjo reacted to nadaveiron's post in the thread More storage treasure: KDJ11-D/S (PDP11/53?) in H9275A cage with analogue, async, SCSI, ether with Like.
11/53 doesn't have cache, so one less thing to worry about.
