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| ====Specifications==== | ====Specifications==== | ||
| + | * A2000 Motherboard [[rw: | ||
| **Chips** | **Chips** | ||
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| * the name Paula is contrived contraction of Ports, Audio, UART and Logic, and coincidentally the chip designer' | * the name Paula is contrived contraction of Ports, Audio, UART and Logic, and coincidentally the chip designer' | ||
| - | | + | ====Case==== |
| + | |||
| + | **Size** | ||
| + | |||
| + | While not exact, these should be close enough for most . | ||
| + | |||
| + | * motherboard | ||
| + | * 360mm deep x 414mm wide x 25mm high, overall or | ||
| + | * 14 3/8" deep x 16 1/2" wide x 1" high, overall | ||
| + | * depth is from the front db9 shroud to the back of the db23 shroud(s) | ||
| + | * the highest component is the keyboard connector | ||
| + | * the bottom mobo RF shielding flexes so the height is close but not always exact | ||
| + | * slot cut-out, by the rear slots | ||
| + | * 15mm deep x 150mm wide or | ||
| + | * 5/8" deep x 5 15/16" wide | ||
| + | |||
| + | Next we have some odd collected data. To me, the important info is Part Number. The Rough Date is literally that. I look at most of the custom chips and pull the date code off of them. I then add a month or two (production of chips + shipping + build time) to get the Rough Date. | ||
| + | |||
| + | ^Rough Date^Mobo Ver^Part^Part Number^Reference Machine^ | ||
| + | |1987 end|4.3|FDD tray|15A060-001|RN2303014| | ||
| + | |1987 end|4.3|drive and power supply tray|15A059-001|RN2303014| | ||
| + | |||
| + | |||
| + | |||
| + | ====Storage==== | ||
| + | |||
| + | * Floppy Disk Drives ([[rw: | ||
| + | * Hard Disk Drives([[rw: | ||
| + | |||
| + | |||
| + | ====Servicing==== | ||
| + | |||
| + | * [[rw: | ||
| + | * [[rw: | ||
| ====Troubles==== | ====Troubles==== | ||
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| |LIGHT GREEN|CIA (U7/U300) problem| | | |LIGHT GREEN|CIA (U7/U300) problem| | | ||
| |BLACK|CIA (U7/U300) problem|If not booting| | |BLACK|CIA (U7/U300) problem|If not booting| | ||
| - | |DARK GRAY|Hardware tested OK|| | + | |DARK GRAY|Hardware tested OK| | |
| - | |LIGHT GRAY|Software tested OK|| | + | |LIGHT GRAY|Software tested OK| | |
| |LIGHT GRAY|CIA (U8/U301) problem|Stops at gray, CIA defective| | |LIGHT GRAY|CIA (U8/U301) problem|Stops at gray, CIA defective| | ||
| - | |BLACK/ | + | |BLACK/ |
| - | |No video|R406 or R215 open R406=1 ohm R215=4.7 ohm|| | + | |No video|R406 or R215 open R406=1 ohm R215=4.7 ohm| | |
| - | |Video scrambled|Agnus or Denise defective|| | + | |Video scrambled|Agnus or Denise defective| | |
| + | CIA 8520 common failure symptoms are: | ||
| + | * dead or flakey floppy drive. DF0:???, icons for nonexistent drives showing up, motor always on, head step problems, etc. | ||
| + | * dead or flakey parallel port | ||
| + | * no mouse/ | ||
| + | * TOD clock not advancing, or only advances a few seconds and resets. | ||
| + | * CLI works okay, but double-clicking on WB icons hangs WB. | ||
| + | * keyboard problems about 30% of the time. Usually it's a bad 6570 micro in the keyboard. | ||
| + | * data errors on the floppy or serial ports are not necessarily 8520 failures. The data from these devices goes to Paula, and in owning and tinkering with Amigas since 1986, I've never seen a bad Paula. | ||
| + | * joystick or mouse directional failure is NOT 8520 related. This is a common misconception. Probably the fuse that looks like a resistor | ||
| + | * CIA at U8 is responsible for the floppy select, motor enable and head step functions | ||
| + | * CIA at U7 is for disk change, track 0 selection, the ready signal and write protect | ||
| + | * C64's 6526 and Amiga 8250 are basically compatible and swappable - one difference is 4 byte BCD time of day counter being replaced with (much more useful) 3 byte binary counter | ||
| + | Real Time Clock not working | ||
| + | * you set the DATE then try to SAVE it only to have a ' | ||
| + | * 1> DATE 07-May-2023 | ||
| + | * 1> SETCLOCK SAVE | ||
| ====Hacks==== | ====Hacks==== | ||
Last modified: le 2021/08/13 02:01