Appearance: UsedFunctionality: Not Working
Description:============As pictured, a Commodore Amiga 500 Motherboard, Rev. 5. Board powers-on and video sync is received, but displays a black screen– sold as-is.
Warranty and Returns:=====================This product is being sold AS-IS without any warranty. Returns are not accepted. To ensure that this is the right product for your needs, we’re happy to answer any questions.
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VariantsA500A500 Plus
Just after the A2000 Commodore released its first affordable machine, the A500. It is basically an A2000 in a compact case with limited expansion capabilities, aimed at the low-end users.The A500 Plus is the same machine with more memory, more screen modes and upgraded Kickstart.
Processor68000 @ 7-28 MHz68020 @ 7-33 MHz68030 @ 16-50 MHz68040 @ 28-35 MHz
All A500 models has a socketed 68000 @ 7.14 MHz on their motherboard. Upgrading the processor requires the use of an accelerator board attached either to the 68000 socket or the side expansion connector.
Memoryup to 2 MB Chip RAMup to 32 MB Fast RAM on processor boardsup to 8 MB Fast RAM on side expansion cards
The A500 shipped with 512 kB Chip RAM which can be upgraded to 1 MB, while the A500 Plus has 1 MB Chip RAM soldered to its motherboard which can be expanded to 2 MB.24 bit Fast RAM can be added using trapdoor or side expansion cards up to 8 MB, and 32 bit Fast RAM using processor boards featuring a 68020 or better.
Custom chipsFat Agnus - OCS / ECS display controllerDenise / Super Denise - OCS / ECS display encoderPaula - audio and I/O controllerGary - system address decoder
The A500 (OCS chip set) and A500 Plus (ECS chip set) support the following screen modes:
A500 A500+ Low High Low High SuperPAL, non-interlacedPAL, interlacedNTSC, non-interlacedNTSC, interlaced 320×256320×512320×200320×400 640×256640×512640×200640×400 320×256320×512320×200320×400 640×256640×512640×200640×400 1280×2561280×5121280×2001280×400 50 Hz, 15.60 kHz50 Hz, 15.60 kHz60 Hz, 15.72 kHz60 Hz, 15.72 kHzEuro36A2024 320×200 - 1280×4001024×1024 73 Hz, 15.76 kHz15 Hz, 15.72 kHzMultiscanEuro72Super72 640×480 - 640×960640×400 - 640×800400×300 - 800×600 60 Hz, 31.44 kHz70 Hz, 31.43 kHz72 Hz, 24.62 kHzA500s using the OCS chip set support either PAL or NTSC screen modes, not both.Low resolution screen modes offer up to 32 colours from a palette of 4096, 64 in EHB mode or 4096 in HAM mode. High resolution screen modes offer 16 colours from 4096, super-high resolution and productivity modes offer 4 colours from a palette of 64.4 channel stereo 8 bit audio output with frequencies up to 28 kHz when using screen modes with 15 kHz, or up to 56 kHz when using screen modes with higher horizontal frequency.A500s with the OCS chip set shipped with Kickstart 1.2 first, later with 1.3. The A500 Plus shipped with 2.04 Kickstart ROM. All versions can be replaced with a 3.1 one.
Expansion slots1× trapdoor expansion slot1× side expansion connector
The trapdoor slot on the A500 is designed for memory expansion cards. The A500 supports 512 kB and the A500 Plus supports 1 MB RAM via this slot.The 86 pin side expansion connector can be used for Fast RAM expansions, hard disk controllers and even for processor boards.
The A500 has a vast array of upgrade options, including processor cards, SCSI or IDE controllers and many other types of expansion.
Interfaces1× serial DB25 male, RS2321× parallel DB25 female, Centronics1× video DB23 male, analog RGB1× composite, black & white2× mouse/game DB9 male2× stereo audio RCA jack1× external floppy DB23 female1× internal floppy 34 pin header
The floppy drive controller supports up to four devices - one attached to the internal floppy header and three connected to the external floppy port. Both double and high density disk drives are supported.A 880 kB double density floppy disk drive is built into the A500's compact case.
Motherboard revisionsrevision 3 (Photo)512 kB Chip RAM on motherboard as 16 chipsKickstart 1.2 ROMrevision 5 (Photo)Fat Agnus 8370 (NTSC) or 8371 (PAL)revision 6 (Photo)Fat Agnus 8372A (part of the ECS chip set) supports 1 MB Chip RAMAgnus is rotated 90° counter clockwise512 kB Chip RAM on motherboard as 4 chipsempty places for other 4 chips giving 1 MB RAM on the motherboardKickstart 1.3 ROMrevision 7-revision 8 (Photo)Kickstart 2.04 ROMs and ECS chip set: Fat Agnus (8375), Super Denise (8373)A500:512 kB Chip RAM on the motherboardbattery and clock circuit is missingA500 Plus:1 MB Chip RAM on the motherboardbattery backed up real time clock