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Conference hydra::amiga_v1

Title:	AMIGA NOTES
Notice:	Join us in the NEW conference - HYDRA::AMIGA_V2
Moderator:	HYDRA::MOORE

Created:	Sat Apr 26 1986
Last Modified:	Wed Feb 05 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5378
Total number of notes:	38326

4242.0. "Rev. 4.3 Mother Boards" by HKFINN::MACDONALD (VAXELN - Realtime Software Pubs) Mon Nov 05 1990 08:48

    My mother board is Rev. 4.3. Is it possible that there were hardware
    changes after V4.3 that might have an impact on software. In other
    words, is the Rev 4.3 board deficient in some regard, especially with
    graphics? 
    
    I stripped out all peripherals from my 2000 over the weekend to run
    some tests for Cliff Dugan (Questronix). Using my very bare 2000 and a
    factory V1.3 Workbench disk, we could not get A64 V1.01n to run. Also,
    MuchMore V2.7 displayed a very jittery scroll (unlike V2.5).
    
    Anyone out there with some thoughts on these problems?

T.R	Title	User	Personal Name	Date	Lines
4242.1	Upgraded your Agnus?	TLE::RMEYERS	Randy Meyers	`Mon Nov 05 1990 13:07`	6
	Re: .0 > My mother board is Rev. 4.3. Is it possible that there were hardware > changes after V4.3 that might have an impact on software. Yes, newer motherboards have the 1meg chip ram Agnus.
4242.2	Me Too	DICKNS::MACDONALD	VAXELN - Realtime Software Pubs	`Mon Nov 05 1990 13:15`	2
	My board has the 1 Mbyte chip ram Agnus too. I am looking for hardware changes on the board that might affect software.
4242.3		ELMST::MCAFEE	Steve McAfee	`Mon Nov 05 1990 14:36`	1
	See 2944.7 also...
4242.4	Software has resistor fix!	KAOA01::PACEY		`Thu Dec 06 1990 10:10`	4
	We had software problems using Quarterback and a jittery monitor during occasions hard to describe. Solved by adding resistor to the bus output driver chip, a known Commodore fix. Resistor was 2.2k 1/4 watt. ask your dealer to install or verify. It fixes fast IO transfer problems.
4242.5		DICKNS::MACDONALD	VAXELN - Realtime Software Pubs	`Fri Dec 07 1990 11:28`	3
	Yes, my 4.3 has been upreved to a 4.5. I believe I used a 2.2 resistor.
4242.6	software or hardware?	KAOA01::PACEY		`Fri Dec 07 1990 13:37`	18
	more info on 4242.4 We were using a CBM-2090A and running QuarterBack to 3.5" internal diskette for backup. Reported write errors to DFn: and aborted job. tests showed there were no actual errors on DFn. Would bomb several times /diskette, occasionally might get all way thru. Two separate A2000s would do this but one would never complete a diskette and had funny noise patterns show on the monitor at times during attempts at backup.This CPU was missing the resistor per note 2944.7 item 5). Worked okay after adding resistor. The other A2000 had resistor but still reported DFn write errors once or twice in several diskettes. Definetly NOT bad or cheap diskettes. This A2000 finally ran Quarterback flawlessly after the Fatter Agness was installed. (never did show any noise on monitor) Tried putting a 1K res. on bus transc. but the harddrive (Seagate) wouldn't always autoboot on powerup so put in a 2.2K for compromise, (did this before Fat Agie installed). Quarterback did tell us they were revising the prog as it was too pushy for the 2090 and some other hardware, weren't specific. So knowing what DEC went thru with the UniBus, why shouldn't CBM have bus speed problems that affect software?