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Recent content by cwathen

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    AST Advantage 613e (similar to 610/611) POST codes / dead board

    Having waited the better part of 25 years to get another AST Advantage system after my original suddenly died with a motherboard fault, the 613e which I've owned for just under a month has done the same. When I first got it I tried to upgrade the 8MB of RAM (2x4MB 72 pin EDO SIMMs) to 16MB. I...
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    Wanted - 14" SVGA monitor with specific Orion M34KZM10XX61 CRT

    I've recently purchased a mid-90's AST Advantage PC with original AST Vision 4L monitor. Unfortunately the CRT was damaged in transit and has a crack on the back of the neck. I really want to try and repair the monitor, which means a tube swap (unless anyone can still do CRT rebuilds?) if I can...
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    AST Vision 4L to HV (Hermes and bad packaging strikes again)

    Having waited since 1998 to re-own an AST Advantage PC, my latest acquisition turned up today, complete with the original AST Vision 4L 14" CRT monitor. From another sale I have the original keyboard and mouse and original manuals and software pack to recreate a fully matched system. I cringed...
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    1541 won't work on VIC20

    Sorry for double post - left it too long to edit. This has now become a bit of a train wreck. Swapping the VIAs fixed the keyboard problem, looks like one of them is very slightly faulty but the other way around it worked fine. My piggybacked chip was working perfectly, so decided to make it...
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    Simplest way to convert TTL RGBI to Analogue RGB

    I'm trying to repurpose a PAL Analogue RGB monitor to work with my Nimbus PC. The Nimbus' output is CGA-ish - TTL RGBI with 16 colours but at 50Hz and with a slightly higher maximum resolution of 640x250. I'm after some advice on the simplest way to convert the TTL level output to something...
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    5150 motherboard ram

    If you're getting no 201 errors than the RAM test has passed so if you have 256KB and have set 256KB fitted then the system has tested for that amount and found it to be in order. As per the previous post, I would suggest your machine hasn't booted DOS but has actually fallen back to the built...
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    IBM 5150 won't run with 8087 fitted

    It's an 8087-1 which should be 10Mhz. The switch is set correctly (although makes no difference what position the switch is in - just having the chip installed stops the system from running in any way). Pics below, would welcome opinion on whether it's a fake or not. Certainly it looks real...
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    IBM 5150 won't run with 8087 fitted

    I picked up an 8087 for my IBM 5150 since it was going cheap. Supposedly this is a NOS part but I have my doubts. With the copro fitted the system doesn't run - not even any sync on the display. Once taken out it runs fine. I do have position 2 on SW1 set to off as per minuszerodegrees. The...
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    Nice acquisition - Citizen 120D with IEC interface

    Nice little pickup from eBay - a Citizen 120D printer with a Commodore IEC interface! Had no idea this even existed, I thought Citizen only offered parallel and (RS232) serial interfaces. I was planning to see if the seller would part with just the interface as already have a 120D+ in my...
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    1541 won't work on VIC20

    I have what I thought was a perfectly working VIC20. I've never tried connecting a disk drive to it until today (always been happy with a cassette drive on it) but it doesn't work, all attempts to access the disk drive gives a device not present error. The drive still does spin up when the...
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    Apple II / Spectrum + Hybrid on eBay

    I do think this Frankenstein creation is worth a look...a Spectrum+ with what looks like some sort of 'stringy floppy' tape cartridge system fudged into an Apple II case! Also adorned with all sorts of labels which seem to suggest it was used as a dedicated wordprocessor for someone, yet the...
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    Amstrad PC-CM Monitor White Screen

    I know there are some Amstrad PC lurkers on here! If anyone has seen my thread in the General forum, just over 5 years ago I acquired an Amstrad PC1512 with PC-CM monitor. It was free based on the monitor being faulty and arcing. An old TV repair engineer I knew inspected the monitor and...
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    Any good examples on discharging a CRT that is actually charged?

    About to do my first ever flyback transformer replacement. The monitor in question (an Amstrad PC-CM) was arcing like hell in 2014, and confirmed due to a dead flyback by an ex-TV engineer I knew. At the time no flyback could be sourced so I just sat on the monitor (complete Amstrad PC system in...
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    Updated Collection List

    It's been a couple of years, thought it was time to review where I am. I've pretty much got all the main systems that I wanted now, with the C128 just sneaking in at the end of 2019. I don't see me acquiring any more complete systems during 2020, this year I think will be more about...
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    C128 Intermittent boot problem

    So my newly acquired C128 has it's first intermittent problem. It has a sticky power switch which I've not yet got around to fixing which has caused it to rapidly pulse on and off before finding the sweet spot where the switch makes good contact (now I don't touch the switch but turn it off and...
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