Shadow Lord
Veteran Member
Hello All,
Please indulge me as I start another long winded post on a restoration effort of mine. The last time I got into this much detail was with my Everex Step Megacube restoration oh so many years ago. That is not to say I have not been playing with/restoring old systems. I just haven’t had the time to take photos, gather my thoughts and post. However, the quarantine has changed that, at least temporarily.
Initially I had planned on posting about the restoration of a Systempro/XL that I had acquired. I finished restoring that system (well as much as any restoration is ever finished – there is always little tweaks that need to be made or parts that need to be acquired that don’t make it in time/can’t be found) earlier this year. It is now up and running 24/7 serving files to all of my “vintage” PCs. The NT 4.0 OS on it is time perfect for interfacing with DOS, OS/2, and windows all the way up to XP/2K3. Unfortunately, that posting will have to wait. Right around the time I finished with the Compaq I came across another system I had been keeping an eye out for: an [URL="https://www.stason.org/TULARC/pc/motherboards/A/AMERICAN-MEGATRENDS-INC-486-SERIES-68-ENTERPRISE-I.html”]AMI Enterprise III[/URL] motherboard.
For those of you not familiar with the Enterprise III here are some specs:
AMI Enterprise III Series 68
Due to limitations of the forum I am going to break the thread into sections with each post being focused on one aspect /subsystem of the system restoration effort. I have tried to make the full size images behind the thumbnails manageable in size so even if you are bandwidth limited it should be okay.
Planned sections:
As always all questions, discussions, constructive criticism, and comments are welcome.
Please indulge me as I start another long winded post on a restoration effort of mine. The last time I got into this much detail was with my Everex Step Megacube restoration oh so many years ago. That is not to say I have not been playing with/restoring old systems. I just haven’t had the time to take photos, gather my thoughts and post. However, the quarantine has changed that, at least temporarily.
Initially I had planned on posting about the restoration of a Systempro/XL that I had acquired. I finished restoring that system (well as much as any restoration is ever finished – there is always little tweaks that need to be made or parts that need to be acquired that don’t make it in time/can’t be found) earlier this year. It is now up and running 24/7 serving files to all of my “vintage” PCs. The NT 4.0 OS on it is time perfect for interfacing with DOS, OS/2, and windows all the way up to XP/2K3. Unfortunately, that posting will have to wait. Right around the time I finished with the Compaq I came across another system I had been keeping an eye out for: an [URL="https://www.stason.org/TULARC/pc/motherboards/A/AMERICAN-MEGATRENDS-INC-486-SERIES-68-ENTERPRISE-I.html”]AMI Enterprise III[/URL] motherboard.
For those of you not familiar with the Enterprise III here are some specs:
AMI Enterprise III Series 68
- 80486 EISA/VLB Mother Board with support for 80484SX, DX, and DX2 based processors. A 80487SX (in case of an 80486SX CPU) and Intel OverDrive Processors via a NON ZIF upgrade socket are supported as well.
- Eight Total Slots: Six Bus Mastering EISA only slots and two Fully Buffered VL-Bus Mastering slots
a. While the VL-Bus slots on the Enterprise III can accept EISA cards (as well as ISA ones) they will only provide Bus Mastering on the VL-Bus and not the EISA bus.
b. Benefits of buffering of the VL-Bus slots according to the manual:
Because VL-Bus Adapter Cards sit directly on the CPU bus, the additional loading on the CPU signals can cause unreliable CPU operation. At 33 MHz, most CPU signals have Setup/Hold times in the order of 10-9 seconds. It is easy to see how timing can be thrown off by the additional load from devices on the VL-Bus. The American Megatrends VL-Bus design includes full buffering for all VL-Bus expansion slots. Each VL-Bus expansion slot always appears as a fixed non-capacitive load on the CPU bus. Therefore, the end user can install any type of VL-Bus compatible Adapter Card on the system and still be certain of totally reliable operation. - Total of 256MB of RAM via 16 30pin SIMM Slots (setup in four banks) with support for Parity and FPM.
- 256KB of L2 Cache
- A non-socketed DS1488 RTC with CMOS support. This also provides the extended CMOS static RAM for the EISA Configuration Utility (ECU).
- “Flash” upgradeable BIOS. I put this in quotes because this is the early flash years which still required you to open the computer case. Updating your BIOS involved setting jumpers on the motherboard and arcane booting instructions. However, it still beats needing a new EPROM.
- Support for PS/2 Mouse
- Support for AT Keyboard (5pin DIN). I am not sure why AMI chose to mix and match standards here. Could just be the time period as the transition was still occurring from AT to the PS/2 standard. Many people would have had AT keyboards on hand.
Due to limitations of the forum I am going to break the thread into sections with each post being focused on one aspect /subsystem of the system restoration effort. I have tried to make the full size images behind the thumbnails manageable in size so even if you are bandwidth limited it should be okay.
Planned sections:
- Introduction (this post)
- Original System and Delivery
- Original Equipment
- Initial Testing
- Restoration, Clean Up, Prep of Case
- Case Painted, Repaired, and Missing Equipment Replaced
- Updates – Motherboard
- Updates – Video and Audio Subsystems
- Updates – Storage and I/O Subsystem
- Installation and Testing of Components Part 1
- Installation and Testing of Components Part 2
- Future Plans
As always all questions, discussions, constructive criticism, and comments are welcome.