First post, by Indrid Cold
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I think it's an interesting configuration, especially regarding to the cause of the problems I encountered while reconfigure and cleaning up everything, as well as guessing correct identification of the CPU.
The case is a nice full tower, vintage but also very robust - the thing that immediately (as I have already shown in another section of the forum) intrigued me was the presence of a tape drive for backup, but not the tapes that I've seen before, but apparently common cassette tapes, with its proprietary controller board. The motherboard is a PC Chips M919, with PCI bus, ISA, VLB, 16MB SIMM RAM, and processor with active heatsink, which immediately made me think of a fairly-high-clocked 486. The CPU then has proved to be an AMD AM486DX4-100 v3.3 - a CPU with good performance and very competitive at the times, able to overcome in the performance the very first Pentium CPUs - in contrast to common DX4 486, the multiplier for this CPU is x3, so with FSB @33MHz, although versions released after had FSB jumped to 40MHZ. The strange thing is that POST signaled the CPU as DX2-100 o_o
After careful investigation and monitoring of the jumpers about configuration of CPU/FSB clock, I found that who has mounted originally this computer had incorrectly configured CPU with FSB @50MHZ, setting x2 as multiplier -___-
So, for all the time of its use (accounting backup - installed operating system: ScoUnix), this PC was used with CPU set with higher FSB (50 instead of 33 MHz) to that for which it was created.
Other present drives are a 5 1/2 floppy drive, 1.44MB floppy, 1.2GB Seagate hard disk (replaced with IDE2CF adapter and 2GB CF with MS-DOS 6.22) to which I later added a Philips DVD, with yellow bezel which seems to be comfortable with the rest. The video card that was present when I was given the computer was REALTEK Quadtel 87-90 RTG 3105 IEH, that I replaced with a common but compatible S3 Virge DX. The audio board was not present, so I chose one of my SoundBlaster 16 models, the CT2890.
