Roland I believe has the highest number of products to be covered here. And a very diverse array of them. The SH-1000 was their first synth product to appear near as I can tell. Here is a page which gives the Corporate History and from there various current product pages and pics of the president and so on are linked.
From a technical standpoint, the company has used fairly high reliability parts it seems over the years. Many of their oldest units are still working according to postings I see. I would say there might be slightly higher rates of problems than Yamaha gear of the 80's and perhaps visa versa for the 70's. But Roland has handled their service issues well and they stock parts for much longer than Yamaha (which is 5 years)! It's always a pleasure doing business with them in my experience.
While the company doesn't really stand out in terms of pioneering accomplishments like Sequential or Yamaha, they do stand out in making very musically useful instruments that have a good track record and LOTS of them! Always striving to improve interface and sound quality on previously existing ideas.
Here is a page with Roland Custom IC's Info. and Reset info.
Products:
SH-1000 SH-2000 SH-3(A) RS-101/202 SH-5 SH-1 SH-2 SH-7 JP-4 Pro Mars VP-330 RS-09 Saturn09 SH-09 JP-8 Juno-6 Juno-60 SH-101 JP-6 JX-3P / MKS-30 MKS-80 Juno-106 MKS-10 MKS-7 JX-8P JX-10 / MKS-70 Alpha Juno1 / Juno2 / MKS-50 MKS-20 S-Series D-50 / D-550 D-10 / D-110 D-20 U-20 / U-220 D-70 JD-800 / JD-990 JV-90/JV-80/JV-50/JV-35 XP-50/JV-1080 XP-60 / XP-80 JV-2080 JV-1010 Fantom
Roland SH 1000 SH 2000 SH 3 SH 3A SH3 SH-3 SH5 SH1 SH2 SH7 JP4 Jupiter-4 Compuphonic Promars Pro-Mars Compuphonic RS09 VP330 Saturn-09 SH09 JP8 Jupiter-8 Jupiter8 Juno6 Juno60 SH101 JP6 Jupiter-6 Jupiter6 JX3P MKS30 MKS80 Juno106 MKS10 MKS7 JX8P JX10 Super JX MKS70 Super JX module Alpha Juno-1 Alpha Juno-2 MKS50 MKS20 S50 S550 D10 D110 D20 U20 U220 D70 JD800 JD990 Super JD JV1080 Super JV XP50 XP60 XP80 JV2080 JV1010