clemon@lemsys.UUCP (Craig Lemon) (06/10/91)
As a spinoff on the recent discussion about the jumper setting of
J300 for video purposes, I was wondering if anyone (possibly Dave) could
assemble and post (or mail me) a list of what all the jumpers in the B2000
are. I have REV 4.2 so I am obviously interested in that but no numbers
should have changed throughout the B2000 line I don't think.
Also, I recently downloaded a program called 'Calibrate' which
allows you to calibrate your battery backed up clock. It prints out the
error between the battery clock and the normal system clock (run by the
TICK line I would assume). It mentions an adjustment pot on the clock that
you may turn to adjust it's speed. Where is the clock circuit? I'd like
to know for two reasons - this adjustment and for when I may need to
replace the battery. I saw a yellow coloured trim pot at the very front of
the case in line with the Co-Processor slot, is this is?
Also, again, Which chip is Kickstart. I'm still running 1.2 while
waiting for 2.04 (or whatever) to be burned and I haven't had to touch it.
It is not labelled on my motherboard. I think that it might be the
socketed chip at the mid-rear of the motherboard. Am I correct?
Thanks in advance for answers to these questions...
--
Craig Lemon - Kitchener, Ontario. Amiga B2000 UUCPv1.13D.
clemon@lemsys.UUCP lemsys!clemon@xenitec.on.ca | Please Mail any binaries
xenitec!lemsys!clemon@watmath.uwaterloo.edu | to 'files' at this site
..!uunet!watmath!xenitec!lemsys!clemon | instead of 'clemon'daveh@cbmvax.commodore.com (Dave Haynie) (06/13/91)
In article <clemon.4060@lemsys.UUCP> clemon@lemsys.UUCP (Craig Lemon) writes: > As a spinoff on the recent discussion about the jumper setting of >J300 for video purposes, I was wondering if anyone (possibly Dave) could >assemble and post (or mail me) a list of what all the jumpers in the B2000 >are. I have REV 4.2 so I am obviously interested in that but no numbers >should have changed throughout the B2000 line I don't think. J101 Select A19/A23 for second Agnus RAM bank select J102 Enable NTSC mode on ECS Agnus, disable test on 512K Agnus J200 Select port 0/port 1 lightpen J300 Selects LINE/VSYNC TICK source J301 Enables 3.5" 880K ID code for DF1: J500 Enable for decoding of $00Cxxxxx as RAM J900 Enable Chip RAM slowdown during DMA I think that's all. >Where is the clock circuit? I'd like to know for two reasons - this >adjustment and for when I may need to replace the battery. I saw a yellow >coloured trim pot at the very front of the case in line with the >Co-Processor slot, is this is? That's it. It's actually a trim cap. The battery is the funny looking blue thing to the right of it. It's a nicad, supposedly good for 10 years or thereabouts. > Also, again, Which chip is Kickstart. I'm still running 1.2 while >waiting for 2.04 (or whatever) to be burned and I haven't had to touch it. >It is not labelled on my motherboard. I think that it might be the >socketed chip at the mid-rear of the motherboard. No, I think you're looking at Gary. The ROM is on the right of the 68000. -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "This is my mistake. Let me make it good." -R.E.M.
leekil@athena.mit.edu (Lee 'S' Kilpatrick) (06/16/91)
In article <22383@cbmvax.commodore.com> daveh@cbmvax.commodore.com (Dave Haynie) writes:
[Description of 2000 jumpers & other internal things.]
Is the connector in the back near the serial port indeed an internal
connection for the serial port, as some guy suggested who fried his Amiga
poking around with these pins?
Leedaveh@cbmvax.commodore.com (Dave Haynie) (06/18/91)
In article <1991Jun15.230048.19216@athena.mit.edu> leekil@athena.mit.edu (Lee 'S' Kilpatrick) writes: >In article <22383@cbmvax.commodore.com> daveh@cbmvax.commodore.com (Dave Haynie) writes: >Is the connector in the back near the serial port indeed an internal >connection for the serial port, as some guy suggested who fried his Amiga >poking around with these pins? Yup, that's an internal serial port header. The main point of this was to make it possible to support an add-on A1000-style serial port, should it be necessary for any peculiar products on the market. For those who don't recall the A1000 serial port, in addition to being the opposite sex as the A500, A2000, and most other computers (since the IBM PClones set the "standard" for what a RS-232 sex a personal computer should be, not totally obvious since the computer acts as both DTE and DCE, especially going way back, when you hooked a terminal up to your personal computer to get it to work), had extra lines available, including a clock and an interrupt input. We figured, if there was anything out there that couldn't get by with a simple gender-bender, a real A1000 compatible D25 could be put in one of the A2000 knockout panels and hooked up here. Other than the occasional BridgeCard user who hooks the BridgeCard beeper output up to the audio input in this connector, I don't know of anyone ever having actually used it. -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "This is my mistake. Let me make it good." -R.E.M.