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AuthorTopic: GVP RAM32 board with A2000-030  (Read 774 times)

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Offline curtis

GVP RAM32 board with A2000-030
« on: May 11, 2018, 10:06:43 PM »
So I've got this in my 2000 with 8MB RAM installed and was wondering if I could install 4MB simms for a total of 32MB RAM.  Everything I've read said it's not possible. That only 8MB is available on this due to the 68030-25 cpu.


Is that right?  It really doesn't make sense that the speed of the cpu limits the amount of RAM.
Outside a dog, a book is a man\'s best friend. Inside a dog it\'s too dark to read! Groucho Marx

Curtis McCain

http://pages.suddenlink.net/curtismc/
 

Offline Oldsmobile_Mike

Re: GVP RAM32 board with A2000-030
« Reply #1 on: May 11, 2018, 10:38:38 PM »
BBOAH says that board supports a maximum of 8MB:

http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1635

Also looks like it uses the proprietary GVP SIMM's.
Amiga 500: 2MB Chip|16MB Fast|30MHz 68030+68882|3.9|Indivision ECS|GVP A500HD+|Mechware card reader + 8GB CF|Cocolino|SCSI DVD-RAM
Amiga 2000: 2MB Chip|136MB Fast|50MHz 68060|3.9|Indivision ECS + GVP Spectrum|Mechware card reader + 8GB CF|AD516|X-Surf 100|RapidRoad|Cocolino|SCSI CD-RW
 Amiga videos and other misc. stuff at https://www.youtube.com/CompTechMike/videos
 

Offline mechy

Re: GVP RAM32 board with A2000-030
« Reply #2 on: May 12, 2018, 01:37:03 AM »
check here also: http://amiga.resource.cx/exp/a3001mk2
apparently the 16-25mhz boards take 8mb on the ram board, and 50mhz could take 20mb.
Some gvp board could use the a2632 with 112MB ram, but i think that old 3001 will not,but check into it,i could be wrong. Jens made a new run of A2632's a while back.
some later gforce boards(040?) could take 64MB  of special 16MB gvp simms($$$).
 

Offline curtis

Re: GVP RAM32 board with A2000-030
« Reply #3 on: May 12, 2018, 03:26:35 PM »
And everybody restated exactly what I already knew.


I want to know WHY?


Why is the 25MHz board restricted to 8MB.


Why can it not use the higher RAM amounts?


Doesn't make sense to me.
Outside a dog, a book is a man\'s best friend. Inside a dog it\'s too dark to read! Groucho Marx

Curtis McCain

http://pages.suddenlink.net/curtismc/
 

Offline Thomas Richter

Re: GVP RAM32 board with A2000-030
« Reply #4 on: May 12, 2018, 04:19:30 PM »
Quote from: curtis;839238
I want to know WHY?
What do you think? Because the 25Mhz version is the entry-level board, and GVP wanted to create some incentives for users to buy the more expensive variants. The glue logic on the board is different, and 8MB is the limit the board can allocate in the autoconfig area. 32-bit access requires additional logic, or at least different programming of the board logic.

From a product definition point of view, this makes perfect sense to me.

Quote from: curtis;839238
Why is the 25MHz board restricted to 8MB.
If you don't like this answer... well, "Because they decided so". That's it. Too late to complain about.
 

Offline Oldsmobile_Mike

Re: GVP RAM32 board with A2000-030
« Reply #5 on: May 12, 2018, 04:33:30 PM »
Myriad technical or cost-cutting measures. Why can't my 68060 run at 600MHz? Why can't I add 100MB of RAM to a stock A500, etc. Like the old beer commercial said, "why ask why?" :lol:
Amiga 500: 2MB Chip|16MB Fast|30MHz 68030+68882|3.9|Indivision ECS|GVP A500HD+|Mechware card reader + 8GB CF|Cocolino|SCSI DVD-RAM
Amiga 2000: 2MB Chip|136MB Fast|50MHz 68060|3.9|Indivision ECS + GVP Spectrum|Mechware card reader + 8GB CF|AD516|X-Surf 100|RapidRoad|Cocolino|SCSI CD-RW
 Amiga videos and other misc. stuff at https://www.youtube.com/CompTechMike/videos
 

Offline giZmo350

Re: GVP RAM32 board with A2000-030
« Reply #6 on: May 12, 2018, 04:38:51 PM »
Quote from: Oldsmobile_Mike;839241
Myriad technical or cost-cutting measures. Why can't my 68060 run at 600MHz? Why can't I add 100MB of RAM to a stock A500, etc. Like the old beer commercial said, "why ask why?" :lol:

How exactly does a posi-trac rear end on a Plymouth work?

  No one knows! It just does.

Sorry..... had to say it! :roflmao:
A500: 2MB Chip, 8MB Fast, IndiECS, MiniMegi, IDE4ZorroII on Z-500, KS1.3/KS3.1, WB3.1&BWB
 
A2000HD: 2MB Chip, 128MB Fast, P5:Blizz 2060@50MHz, PCD-50B/4GBCF, XSurf100, RapidRoad, IndiECS, Matze RTG, MiniMegi, CD-RW, SunRize AD516, WB3.9
 
A1200: 2MB Chip, 64MB Fast, 4GBCF, GVP Typhoon 030 @40MHz w/FPU, Subway USB, EasyNet Ethernet, Indi AGA MKI, FastATA MK-IV, Internal Slim CD/DVD-RW, WB3.5

"The internet doesn't weigh anything Jen
 

Offline utri007

Re: GVP RAM32 board with A2000-030
« Reply #7 on: May 12, 2018, 05:17:37 PM »
I had this http://amiga.resource.cx/exp/a3001, with 8mb daughter board.

Memory is mapped to Zorro II space, so no RTG with more than 4mb ram.

It uses rare nibble mode sims, (what ever it means?) so it seems that some people has managed to get quite much money when selling them.
ACube Sam 440ep Flex 800mhz, 1gb ram and 240gb hd and OS4.1FE
A1200 Micronic tower, OS3.9, Apollo 060 66mhz, xPert Merlin, Delfina Lite and Micronic Scandy, 500Gb hd, 66mb ram, DVD-burner and WLAN.
A1200 desktop, OS3.9, Blizzard 060 66mhz, 66mb ram, Ide Fix Express with 160Gb HD and WLAN
A500 OS2.1, GVP+HD8 with 4mb ram, 1mb chip ram and 4gb HD
Commodore CDTV KS3.1, 1mb chip, 4mb fast ram and IDE HD
 

Offline curtis

Re: GVP RAM32 board with A2000-030
« Reply #8 on: May 12, 2018, 10:00:53 PM »
THAT'S what I wanted to know!


Thanks Thomas.


Curtsi



Quote from: Thomas Richter;839239
What do you think? Because the 25Mhz version is the entry-level board, and GVP wanted to create some incentives for users to buy the more expensive variants. The glue logic on the board is different, and 8MB is the limit the board can allocate in the autoconfig area. 32-bit access requires additional logic, or at least different programming of the board logic.
 
From a product definition point of view, this makes perfect sense to me.


If you don't like this answer... well, "Because they decided so". That's it. Too late to complain about.
Outside a dog, a book is a man\'s best friend. Inside a dog it\'s too dark to read! Groucho Marx

Curtis McCain

http://pages.suddenlink.net/curtismc/
 

Offline thebajaguy

Re: GVP RAM32 board with A2000-030
« Reply #9 on: May 20, 2018, 06:43:19 PM »
Original A3001 had 4 MB and 8MB of Nibble mode SIMMs, placed via AutoConfig, into the 8MB space.  ~1988-1989 IIRC.   Supported DMA from Zorro II.  I think it beat the A2630 out (not the A2620), and was the first to do this.  Ronin, CSA, and any others of the early accelerator group either mapped it high, or didn't support DMA in the AutoConfig space, if they autoConfig'd it in the first place (AddMem!).  It was called the A3001 because it was better (faster) than the A3000 that was yet to appear on the market.  It pissed C= off a tad, at the time, yes.

Nibble-mode memory directly supports 68030 CPU burst mode, which sends 4 bits instead of one per memory access, thereby populating the cache more efficiently for sequential instruction and data accesses.  you needed 4 modules as each 30-pin SIMM was 8-bits wide.  You pay a small penalty if all you needed was 1 32-bit longword.

If you had a sequential need for data, and memory clock penalty was 3 for each 32-bit longword, you got 4 longwords in 12 clocks.  In burst, it takes 6, assuming 3-1-1-1.   Varies based on memory speed, and the clock of the CPU.  I don't recall the settings on the memory boards, but 3-1-1-1 and 4-1-1-1 seem like they applied - distant memories.  50Mhz may have been 5-2-2-2 or 6-2-2-2, but remember this is 50Mhz clocks, not 25/28 or 33Mhz.  

RAM32 memory card and the SIMM32's came out to replace the nibble-mode SIMMs and uses them in groups of 4 to get the same kind of 'burst' from memory that only sends 1-bit (x32).  At the time, 32-bit SIMM standards were not established.  GVP made their own, and the design was for 1, 4, and 16MB modules, but the original boards only supported the classic 8MB AutoConfig.  Same with the 33Mhz.  Note the SIMM32 memory is not 80ns or 70ns like the nibble-mode memory, but 60ns, so boards' memory logic are tuned to that speed, which improved at some speeds.

The RAM32 board is identical between speed variants, but the PALs used  (and jumpers) select different AutoConfig amounts, clock timing, and  addresses the memory is found at.  Memory mapped high is detected by the  v3.x driver ROM and mapped into the free memory list very early on.

Later, the 50Mhz top of the line board got 4/8 Autoconfig with 1MB SIMMs, or the same 4MB with 1MB modules + 4/8/12/16 mapped high with 4MB modules, and the memory clocking was adjusted for 50Mhz.  A later revision got 4/8MB AutoConfig with only 4MB modules, and 4/8/12/16/20/24 mapped high, or optionally all modules mapped high for 32MB.  

 The low end 25/28/33Mhz A3001 sandwich boards were replaced with the Combo 22/33Mhz SMC series, and then all were replaced with the G-Force (PGA CPU) 68030 line (25MhzEC/40MhzEC/50MhzFull).


The G-Force 68040 was the first to use the 16MB variants of the module, but supported the 4MB version.
« Last Edit: May 20, 2018, 06:58:38 PM by thebajaguy »
Former GVP Tech Support 1989-1993 - Bloodied in the original trenches of the Amiga Wild Wild West.