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Author Topic: GVP A1230 Jaws jumpers?  (Read 3982 times)

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Offline Ilwrath

Re: A1230 Jaws jumpers?
« Reply #14 from previous page: June 03, 2009, 12:36:49 PM »
Crap...  I forgot all about this thread.  I did find my manual, though, and have a PDF of it I scanned.  Anyhow, for GVP A1230 Turbo+ (original) you are correct, the only change is remove J5 for 16MB SIMMS.  Also, largest sized SIMM must go in Slot 1.

A1230 Turbo+ (original) Jumpers:
J1 - ON - 68020 / (OFF - 68030)
J2 - RESERVED (ON)
J3 - RESERVED (OFF)
J4 - RESERVED (OFF)
J5 - (ON - No 16MB SIMMS) / OFF - 16MB SIMMS PRESENT
J6 - RESERVED (OFF)

CN4 - RESERVED (OFF)
CN5 - (ON - 4k REFRESH DRAM 16M) / OFF - 2k REFRESH DRAM 16M
CN6 - RESERVED (ON)
CN7 - RESERVED (OFF)

(.)=DEFAULT

So, PM me your email address, if you want a PDF manual for any of the following:
GVP A1230 Turbo+ (original, no expansion port)
GVP A1230 Turbo+ Series II
GVP A1291 SCSI Kit Performance Series II (SCSI expansion for A1230+ Series II)
« Last Edit: June 03, 2009, 12:37:58 PM by Ilwrath »
 

Offline trilobyteTopic starter

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Re: A1230 Jaws jumpers?
« Reply #15 on: June 03, 2009, 06:23:34 PM »
Quote from: Ilwrath;508952
Crap...  I forgot all about this thread.  I did find my manual, though, and have a PDF of it I scanned.  Anyhow, for GVP A1230 Turbo+ (original) you are correct, the only change is remove J5 for 16MB SIMMS.  Also, largest sized SIMM must go in Slot 1.


Badical.  Thank you.  I'll PM you the email, I really appreciate it.

- t
Amiga user since \'96, when I could finally afford one
Commodore 8-bit since before I could tie my shoes
 

Offline Floid

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Re: GVP A1230 Jaws jumpers?
« Reply #16 on: June 03, 2009, 07:28:41 PM »
Quote from: trilobyte;508801
What do these refresh settings mean, anyway?  I see them on all the GVP accel boards.  Is it a speed thing?

thanks,
t
Refers to the layout of the DRAMs, more of a 'timings' thing than a significant performance thing:
http://www.oempcworld.com/support/2K_vs_4KRefresh.htm
 

Offline danbeaver

Re: GVP A1230 Jaws jumpers?
« Reply #17 on: January 29, 2023, 04:30:21 AM »
GVP A1230+ JAWS II jumper 3 = on for 1 / 4 MB ram simm,
Jumper 3 off for a 16 MB simm. J5 = on for ROM enabled.
Others don't matter.