From hedley Fri Jul 27 18:43:03 1990 Received: from WCHEST.DECnet MAIL11D_V3 by cbmvax.cbm.commodore.com (5.57/UUCP-Project/Commodore Jan 13 1990) id AA04140; Fri, 27 Jul 90 18:42:59 EDT Date: Fri, 27 Jul 90 18:42:58 EDT Message-Id: <9007272242.AA04140@cbmvax.cbm.commodore.com> From: wches3::davis To: cbmvax::perry, cbmvax::daveh Status: R Perry, Here is a first cut at a document that is getting requested throughout the company. Please review it and provide your comments to me. Please do not distribute this as I do not want to have to hassle with dealing with inaccurate copies in circulation. Thanks Hedley A3000 PCB REV LEVELS V0.0 ( first draft ) ----------------------------------------------- A variety of A3000 motherboards and daughtercards have been produced. This note outlines the changes made on the various prodution versions of the A3000. Boards are identitified by a numeric rev level. Increasing the ones digit denotes new artwork, while increasing the tenths digit denotes levels of rework. Note that there are TWO types of boards bearing rev 6.1 markings. The first is a board marked with the silkscreen as rev 6 which has been reworked to the rev 6.1 level. The second is a board that was actually silkscreened as a rev 6.1 board. These boards are identical to boards marked rev 7.0, only the silkscreen was corrected. Many intermediate revs which never left the factory are seen in this list. They are listed here because many internal commodore machines may be of that type. Units shipped to end customers are marked. Motherboard: ------------ Rev 9.0 **** Shipped to end customers. **** Current production rev. No rework required. Rev 8.9 **** Shipped to end customers. **** This rev is just like the rev 9.0 artwork, only some small changes were made. This rev is actually the rev 8 inner layers combined with the rev 9 outer layers. This allowed rom towers to be phased out sooner than otherwise possible. No rework required. Rev 8.0 No boards of this type were produced. This was intended to be a cosmetic change. No rework required. Rev 7.3 **** Shipped to end customers. **** Indicates that the ROM tower is fastened with wire ties. No rework required. Rev 7.2 indicates that this board has had a rom tower as opposed to EPROMs. No rework required. Rev 7.1 These boards had a pull-up wired to the SCSI select line. Without this pullup, the system might not boot if no SCSI devices were connected. All A3000s are shipped with a SCSI device built-in ( providing termination ). The only reason to add this jumper was to facilitate production processes that did not want a hard drive attached. No rework required. Rev 7.0 ( and boards with rev 6.1 silkscreened on them ). These boards corrected all known problems with the rev 6 boards. The SCSI terminators were changed to the defacto standard of 3 8-pin resistor packs. Only sockets were installed in the PCB, SCSI termination was not installed on the board. Important User Note: These boards will not boot without at least one SCSI device attached ( such as the internal hard drive ). If desired, this can be alleviated by jumpering U800 pin 6 to RP350 pin 4. Adding such a jumper would make this board a rev 7.1. Note that the this level works great provided that a terminated SCSI hard drive is attached. No rework required. Rev 6.1 **** Shipped to end customers. **** ( Silkscreen says rev 6.0 in middle of board, label says rev 6.1 . Note that some rev 7 boards were produced that had 6.1 silkscreened on them. These are really rev 7 boards. ) First production boards. These can be easily identitfied by a rework wire running to the FPU from near the fastram section. Important User Note: On these units, SCSI termination is mounted directly on the motherboard. Therefore no termination should be attached to the internal drive. All other revs of A3000 have no termination on the motherboard and require one and only one internal SCSI device to be terminated. No rework required. Rev 6.0 First production candidate. Included obselete gate arrays, bogus system software in EPROMS, illegal sockets for 84 pin PLCCs, etc. etc.... The rework required to make these boards functional can only be performed at the factory. ( See ECR/ECO WC0101 for details ). Daughter Card ------------- Rev 7.1 **** Shipped to End Customers **** Current production rev. Soon to be replaced with rev 8 pcb which will, alledgedly, require no rework. Rev 7.0 Rev 7 boards where created to eliminate the need for +12V jumper to the XT slots. A mistake was made in the PCB creation process causeing an inner layer short between the +12V & -5V power lines. All of these boards were reworked at the factory. Rev 6.1 **** Shipped to end customers. **** No rework required. These are reworked rev 6.0 pcbas. Rev 6.0 **** Shipped to end customers. **** This version was created to add components to support an alternate product. It was noticed while these boards were being manufactured that on this and all previous revs of the daughter card, +12V was errantly not connected to the XT expansion slots. Required rework: + 12 volts is missing from the XT slots. Pin b9 of the XT slot should be connected to a source of +12 on the daughter card. Mark board rev 6.1 Rev 5.1 **** Shipped to end customers. **** This is a fully corrected rev 5 pcba. No rework required. Rev 5.0 **** Shipped to end customers. **** This rev is functionaly identical to rev 4.1. Required rework: + 12 volts is missing from the XT slots. Pin b9 of the XT slot should be connected to a source of +12 on the daughter card. Mark board rev 5.1 Rev 4.2 **** Shipped to end customers. **** This is a fully corrected rev 4 or rev 3 pcba. No rework required. Rev 4.1 **** Shipped to end customers. **** This is a correct rev 3 or rev 4 pcb. Required rework: Jumper +12V ( on the daughter card ) to pin B9 on a XT slot. Mark the board 4.2 Rev 4.0 & rev 3.0 **** Shipped to end customers. **** The only difference between rev 3 & 4 daughter cards is the silkscreen. There are no functional differences. Required rework: Jumper RP603 pin 5 to CN603 pin 51. Jumper RP608 pin 2 to CN602 pin 86. + 12 volts is missing from the XT slots. Pin b9 of the XT slot should be connected to a source of +12 on the daughter card. Mark board rev 4.2 Note that no end-user A3000 motherboards require rework. The daughter card may require up to 3 jumpers, depending on the vintage. There are also some user issues, things the owner should be aware of, if he or she owns a rev 6.x or 7.0 motherboard.