Re: DEC MS630/M7609 Question
M7608 == 4MB M7609 == 8MB AFAIK the only DEC 16MB Q-bus board is the MS650 M7622 for the KA640, KA650, KA655, KA660 On Tue, Jul 9, 2019, 2:36 PM W2HX via cctech wrote: > Hi there. > > > I just acquired a board with the number M7609. It was advertised as an > M630-CA which my research tells me is supposed to be 16MB. How do I tell on > the board if this is 8MB or 16MB? There does not seem to be a suffix on the > board that I can see. > > > What to look for? > > 73 Eugene W2HX > > >
Re: DEC MS630/M7609 Question
On 09/07/2019 22:11, W2HX via cctech wrote: Hi there. I just acquired a board with the number M7609. It was advertised as an M630-CA which my research tells me is supposed to be 16MB. How do I tell on the board if this is 8MB or 16MB? There does not seem to be a suffix on the board that I can see. What to look for? The simple answer is to install it in a uVAX2 system and see what it says :-) IIRC the M7608 comes in (at least) two variants, the MS630-BA, which is 2MB, and the MS630-BB, which is 4MB. I think that if you hold them side by side, it's obvious one has half the memory positions not filled. But the M7609 is an MS630-CA, which is always 8MB. There are various suffixes to the MS7609 board, but they (I think) just tell you the manufacturer of the RAM chips; the board is always 8MB. Antonio -- Antonio Carlini anto...@acarlini.com
Re: DEC MS630/M7609 Question
Thanks, Lyle. I was reading this. I guess its wrong? https://en.wikipedia.org/wiki/MicroVAX The MS630 memory expansion module was used for expanding memory capacity. Four variants of the MS630 existed: the 1 MB MS630-AA, 2 MB MS630-BA, 4 MB MS630-BB and the 16MB MS630-CA. Wouldn't be the first time wikipedia was wrong... Eugene From: Lyle Bickley Sent: Tuesday, July 9, 2019 6:08 PM To: cct...@classiccmp.org Cc: W2HX Subject: Re: DEC MS630/M7609 Question On Tue, 9 Jul 2019 21:11:39 + W2HX via cctech wrote: > Hi there. > > > I just acquired a board with the number M7609. It was advertised as an > M630-CA which my research tells me is supposed to be 16MB. How do I tell on > the board if this is 8MB or 16MB? There does not seem to be a suffix on the > board that I can see. > > > What to look for? M7609-AAMS630-CAQ 8-Mbyte parity 36-bit RAM for KA630 (MicroVAX II) Lyle -- 73 NM6Y Bickley Consulting West Inc. https://bickleywest.com "Black holes are where God is dividing by zero"
Re: DEC MS630/M7609 Question
On Tue, 9 Jul 2019 21:11:39 + W2HX via cctech wrote: > Hi there. > > > I just acquired a board with the number M7609. It was advertised as an > M630-CA which my research tells me is supposed to be 16MB. How do I tell on > the board if this is 8MB or 16MB? There does not seem to be a suffix on the > board that I can see. > > > What to look for? M7609-AAMS630-CAQ 8-Mbyte parity 36-bit RAM for KA630 (MicroVAX II) Lyle -- 73 NM6Y Bickley Consulting West Inc. https://bickleywest.com "Black holes are where God is dividing by zero"
Re: DEC MS630/M7609 Question
On Tue, 9 Jul 2019 23:43:17 + W2HX wrote: > Thanks, Lyle. I was reading this. I guess its wrong? > > https://en.wikipedia.org/wiki/MicroVAX > > The MS630 memory expansion module was used for expanding memory capacity. > Four variants of the MS630 existed: the 1 MB MS630-AA, 2 MB MS630-BA, 4 MB > MS630-BB and the 16MB MS630-CA. The use of suffix's to identify the amount of memory was common with DEC - and the line I copied only referenced the "AA" version of the MS630. > Wouldn't be the first time wikipedia was wrong... Their probably right (in this case ;) Lyle __ > From: Lyle Bickley > Sent: Tuesday, July 9, 2019 6:08 PM > To: cct...@classiccmp.org > Cc: W2HX > Subject: Re: DEC MS630/M7609 Question > > On Tue, 9 Jul 2019 21:11:39 + > W2HX via cctech wrote: > > > Hi there. > > > > > > I just acquired a board with the number M7609. It was advertised as an > > M630-CA which my research tells me is supposed to be 16MB. How do I tell on > > the board if this is 8MB or 16MB? There does not seem to be a suffix on the > > board that I can see. > > > > > > What to look for? > > M7609-AAMS630-CAQ 8-Mbyte parity 36-bit RAM for KA630 (MicroVAX II) > > Lyle > -- > 73 NM6Y > Bickley Consulting West Inc. > https://bickleywest.com > > "Black holes are where God is dividing by zero" -- 73 NM6Y Bickley Consulting West Inc. https://bickleywest.com "Black holes are where God is dividing by zero"
Re: DEC MS630/M7609 Question
> The simple answer is to install it in a uVAX2 system and see what it > says :-) Or look up the part number on one of the DRAM chips, count the number of DRAM chips, and then work out the total. If the M7609 uses 256Kbit DRAM chips (as all MS630 boards do), then 9 of them are 256KB with parity, 36 of them are 1MB, and the total of 288 256Kbit DRAM chips on the M7609 is a total of 8MB.
Re: DEC MS630/M7609 Question
DEC used to use the first letter of the suffix for density, and the second letter for the chip manufacturer. On Wed, Jul 10, 2019 at 12:08 PM Glen Slick via cctalk < cctalk@classiccmp.org> wrote: > > The simple answer is to install it in a uVAX2 system and see what it > > says :-) > > Or look up the part number on one of the DRAM chips, count the number > of DRAM chips, and then work out the total. > > If the M7609 uses 256Kbit DRAM chips (as all MS630 boards do), then 9 > of them are 256KB with parity, 36 of them are 1MB, and the total of > 288 256Kbit DRAM chips on the M7609 is a total of 8MB. >
