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6,654 pages: 1,289 machines, 702 software, 460 companies, 64 history, 17 articles, 59 fun.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

content/museum/altos-computer-systems-acs-580.md

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+---
+title: Altos Computer Systems ACS-580
+categories:
+- Computers
+types:
+- Professional Computer
+origins:
+- U.S.A.
+years:
+- '1981'
+cpus:
+- Z80A
+params:
+  name: ACS-580
+  company: /companies/altos-computer-systems
+  company_name: Altos Computer Systems
+  specs:
+  - label: NAME
+    value: ACS-580
+  - label: MANUFACTURER
+    value: Altos Computer Systems
+  - label: TYPE
+    value: Professional Computer
+  - label: ORIGIN
+    value: U.S.A.
+  - label: YEAR
+    value: ? 1981
+  - label: KEYBOARD
+    value: Full-stroke keyboard with numeric and editing keypads, 16 function keys, 108 keys
+  - label: CPU
+    value: Z80A
+  - label: SPEED
+    value: 3,5 Mhz ?
+  - label: RAM
+    value: 192k (max. 256k)
+  - label: ROM
+    value: 4k
+  - label: TEXT MODES
+    value: 40 x 25, 80 x 25, 132 x 40
+  - label: GRAPHIC MODES
+    value: 800 x 325
+  - label: SOUND
+    value: Beeper
+  - label: I/O PORTS
+    value: Five, four or three RS232 ports (depending on models), RGB video out, Centronics, TV video output
+  - label: BUILT IN MEDIA
+    value: one or two 5''1/4 disk-drive (720k), and one hard-disk (10, 15, 20 or 40Mb)
+  - label: OS
+    value: CP/M 2.2, M/MP-80, OASIS
+  - label: POWER SUPPLY
+    value: Built-in PSU
+  - label: PERIPHERALS
+    value: Hard-disk, streamer, disk-drive, printer
+  tabs:
+  - adverts
+  adverts:
+  - title: OEMS WANTED
+    subtitle: ''
+    text: ''
+    image: null
+  oc_id: 516
+  source:
+    url: https://web.archive.org/web/20230603211506/http://www.old-computers.com/museum/computer.asp?c=516
+    date: '2023-06-03'
+---
+
+This was a multi-post system based on Z80 CPUs. It could handle up to 3 users, or more with optional cards. To connect the terminals, there are several RS232 ports at the back of the system, labeled JA, JB, JC, JD, JE, etc... The ports not used by the terminals could be used to connect a modem or a printer for example.
+
+This system was quite well designed with its squashed hexagon shaped box and its thin monitor. These are medium-sized desktop cases, usually beige but often came in custom colors.
+
+The 580 systems used a large custom single-board computer, with the drive controller being a separate half-card mounted on top of the SBC.
+
+It had a 5''1/4 disk-drive built-in on the right part of the front panel, and a 5''1/4 hard-disk on the left part.
+
+The **580-2** had two 5''1/4 disk-drives built-in instead of just one.\
+Altos also produced a 16-bit version of this system, called the [ACS-586](/museum/altos-computer-systems-acs-586-686/).
+
+**Bill** added this information :\
+Ours ran three user MP/M in a 16K common section and three 48K user sections of RAM. Neat thing to work with when there were no other uses because you could hit a key sequence on the terminal and switch it from one user space to another. So, I could use all three user spaces. I'd have an editor open in one, use another to compile and debug and the third to print or check files while debugging.
+
+*Picture courtesy of [Gaby's CP/M Homepage](http://www.gaby.de).*