2200 A/B scientific and 2200 VP Systems
Both of my Wangs have the same CPU: 2200-T, which was the last of the first generation 2200 family. The main thing that differentiated the -A, -B, -C, -S, and -T models was the microcode that shipped with them. It was a field upgrad to switch from one model to the other, which involved ucode board swaps. Actually the CPU underwent a redesign between the -A,-B,-C and the -S,-T CPUs. Some of the cards were the same and the backplane signals were nearly identical. I think that Wang probably had to redesign it because the earlier ones weren't cost effective anymore, so they took advantage of higher density components.
Your web site says you have a 2200-A CPU. In fact, it might have been an -A at one time, but the upgrade to the 2200VP was a complete CPU change. The IO bus is identical between the first generate and the VP family (-VP, LVP, SVP, etc), but the CPU is radically different. Internally the VP is really a very nice design, having good support for 8b and 16b operations. The first generation CPU operated on nibbles. In the interest of code density, subroutine calls were used everywhere to save a word or two of ucode whenver possible, even if it meant that the code was going to run at 1/2 the speed as a result.
For instance, the 16b memory address register, called PC in the Wang manuals, can be loaded in a single (600ns) microcycle in the VP. In the 2200-ABCST, it was four (1600ns) microcycles. However, it was often worse, due to the desire to save code. So instead of
PC3 = imm 0
zeropc: PC3 = imm 0
Also, subroutines took one cycle on the call and two cycles on the return, so in total that code would take 16 us on the -T instead of 600 ns on the VP.
The terminal part of it is a 64x16 display. It was manufactured in 1973. The CPU is for 1977 or so. The printer is a modified selectric; although it has a centronics-style connector, the interface isn't centronics. I suspect there used to be a box that converted protocol from centronics to selectric-speak. Wang made and I/O card that drove it directly, but this system doesn't have the card (and the system and printer came from the same guy, so that's why I think a piece is missing).
The Wang computer I have is the WSC/30 and was in a desk with the printer, as pictured. These three units were the components of the WSC/30, only my disk drive has 2 drives (A and B) and the printer and the desk are now gone. I worked on the 2.5MM hard drive to the right in the picture but very few companies could afford one, so I used Wang Laboratory's for system development. One other difference is that my CPU unit (2200A) was one of the first "VP" processors, which was the fastest 32K processor Wang made for the work stations. I have the 3 component part's documentation, some utility programs and books, and several new blank 7" disks. I not only have the marketing brochure for the equipment, but the 2" thick Wang Basic Programing manual. The desk that held the CRT, Disk drives and CPU (behind the knee well wall), was a very large, heavy-duty metal desk which took up a lot of room and I disposed of it long ago. It was 34" deep and 5' wide. It would have been cost-prohibitive to ship. These components were made sometime around 1978-79.
The Equipment description
Rhode Island Computer Museum's page on the Wang 2200VP
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