dphirschler Posted November 11, 2023 Share Posted November 11, 2023 Found this at a vintage computer show. Any idea what it is and if there is some documentation for it? Not mine, but the owner would like to know. Darryl 2 Quote Link to comment Share on other sites More sharing options...
RickyDean Posted November 11, 2023 Share Posted November 11, 2023 Horizon Ram Disk, about a 2000 model maybe? 2 Quote Link to comment Share on other sites More sharing options...
+9640News Posted November 11, 2023 Share Posted November 11, 2023 Looks like a triple stacked, 256K Horizon Ramdisk from the mid 80's. 3 Quote Link to comment Share on other sites More sharing options...
GDMike Posted November 12, 2023 Share Posted November 12, 2023 Watch those diodes Quote Link to comment Share on other sites More sharing options...
RickyDean Posted November 12, 2023 Share Posted November 12, 2023 10 minutes ago, GDMike said: Watch those diodes Looks like they are tied in commonly, they all seem to be touching, like they're all feeding from the same source and taking the current to the various points on the board, but it does look scary! Quote Link to comment Share on other sites More sharing options...
+bent_pin Posted November 12, 2023 Share Posted November 12, 2023 14 minutes ago, GDMike said: Watch those diodes That's an or gate. 2 1 Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted November 12, 2023 Share Posted November 12, 2023 The serial number (#1035) tells me Horizon Ramdisk 1000 PS Some "serial" info that I gathered from Ksarul some years ago: (red means "not confirmed") 1 Quote Link to comment Share on other sites More sharing options...
globeron Posted November 12, 2023 Share Posted November 12, 2023 (edited) I use to have the manuals for different HRDs and I sold one before. my HRD3000 built in Geneve has 3x batteries. For TI Also there is software for it called ROS 8.14 F here is a video with my HRD3K Edited November 12, 2023 by globeron 1 Quote Link to comment Share on other sites More sharing options...
+InsaneMultitasker Posted November 12, 2023 Share Posted November 12, 2023 Current software here. 3 Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted November 12, 2023 Share Posted November 12, 2023 It is an HRD1000, as @Schmitzi noted and based on the serial number. One of these two manuals should match the specifics of the board, with the HRD+ manual being the most likely direct match. HRD Reference Manual - Booklet.pdf HRD+ Ramdisk.pdf 4 2 Quote Link to comment Share on other sites More sharing options...
+bent_pin Posted November 13, 2023 Share Posted November 13, 2023 21 hours ago, Ksarul said: It is an HRD1000, as @Schmitzi noted and based on the serial number. One of these two manuals should match the specifics of the board, with the HRD+ manual being the most likely direct match. HRD Reference Manual - Booklet.pdf 13.71 MB · 6 downloads HRD+ Ramdisk.pdf 10.01 MB · 7 downloads These are great. I'm building a 6502 PC from scratch and I'd like to use a RAM disk and an SD RAID as a hybrid storage system. I had a general idea, but reading up on the design of others will help solidify some issues that I'm on the fence about. Quote Link to comment Share on other sites More sharing options...
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