Camintonn CMV-504 - Revision history

Jnc: Jnc moved page CMV-504 to Camintonn CMV-504: naming sys

2020-12-14T00:48:10Z

Jnc moved page CMV-504 to Camintonn CMV-504: naming sys

Jnc: +cat, +links

2018-12-11T02:33:14Z

+cat, +links

Jnc: link card form factor

2016-09-09T22:36:45Z

link card form factor

Jnc: /* Dual-chip capability */ clarify

2016-09-08T17:31:36Z

‎Dual-chip capability: clarify

Jnc: Add config info

2016-02-20T16:06:13Z

Add config info

Jnc: What is known to date

2016-02-20T14:14:55Z

What is known to date

New page

The '''Camintonn CMV-250''', '''CMV-500''', '''CMV-254''' and '''CMV-504''' are a series of [[QBUS]] memory cards, in dual QBUS card-size format, with capacities of 256 Kbytes, 512 Kbytes, 1 Mbyte and 2 Mbytes, respectively. They all use the same [[PCB]], and have capacities of 128-512 Kbytes when using 64Kx1 [[DRAM]]s, or 512 Kbytes - 2 Mbytes (using 256Kx1 DRAMs).

The board was normally sold with 1, 2, or 4 rows of chips. (Interestingly, there must be two ways to produce a CMV-500 - 1 row of 256Kx1 parts, or 4 rows of 64Kx1 parts. An example of the latter has not been spotted as of yet.)

==Dual-chip capability==

The CMV-2xx/-5xx series has the ability to use either 64Kx1 DRAMs or 256Kx1 DRAMs, using a set of jumpers which are not covered in the available documentation.

Down near the fingers, there are a block of 6 solder pads, denoted thus:

MPR<br>NOS

(Note that there is _another_ 'S' jumper on the board, at the top.)

Available documentation describes them as "Starting and ending address boundary" (but without giving any detail as to their operation).

On one version of the board, configured for 256Kx1 chips, it has jumpers on M-N, P-R, and etch cuts on R-S, N-O (which is likely the configuration for 64K chips' although this has not been verified).

Another variant of the board, also using 256Kx1 chips, has a slightly different PCB (likely a later revision), and has no jumpers, but has etch connections M-N, P-R (note - the same as the previous board has jumpers).

@@ Line 1: / Line 1: @@
-The '''Camintonn CMV-250''', '''CMV-500''', '''CMV-254''' and '''CMV-504''' are a series of [[QBUS]] memory cards, in [[DEC card form factor|dual]] QBUS card-size format, with capacities of 256 Kbytes, 512 Kbytes, 1 Mbyte and 2 Mbytes, respectively. They all use the same [[PCB]], and have capacities of 128-512 Kbytes when using 64Kx1 [[DRAM]]s, or 512 Kbytes - 2 Mbytes (using 256Kx1 DRAMs).
+The '''Camintonn CMV-250''', '''CMV-500''', '''CMV-254''' and '''CMV-504''' are a series of [[QBUS]] memory cards, in [[DEC card form factor|dual]] QBUS card-size format, with capacities of 256 Kbytes, 512 Kbytes, 1 Mbyte and 2 Mbytes, respectively. They all use the same [[printed circuit board|PCB]], and have capacities of 128-512 Kbytes when using 64Kx1 [[DRAM]]s, or 512 Kbytes - 2 Mbytes (using 256Kx1 DRAMs).
-The board was normally sold with 1, 2, or 4 rows of chips. (Interestingly, there must be two ways to produce a CMV-500 - 1 row of 256Kx1 parts, or 4 rows of 64Kx1 parts. An example of the latter has not been spotted as of yet.)
+The board was normally sold with 1, 2, or 4 rows of [[integrated circuit|chips]]. (Interestingly, there must be two ways to produce a CMV-500 - 1 row of 256Kx1 parts, or 4 rows of 64Kx1 parts. An example of the latter has not been spotted as of yet.)
 ==Configuration==
@@ Line 103: / Line 103: @@
 ==Dual-chip capability==
-The CMV-2xx/-5xx series has the ability to use either 64Kx1 DRAMs or  256Kx1 DRAMs, using a set of jumpers which are not covered in the available documentation.
+The CMV-2xx/-5xx series has the ability to use either 64Kx1 DRAMs or  256Kx1 DRAMs, using a set of [[jumper]]s which are not covered in the available documentation.
 Down near the fingers, there are a block of 6 solder pads, denoted thus:
@@ Line 120: / Line 120: @@
 "''SMS 1000 Microcomputer System Models 40, 41 and 50 OEM Manual''", February 1987, Scientific Micro Systems, Inc.; pages 4-37 to 4-47

← Older revision		Revision as of 22:36, 9 September 2016
Line 1:		Line 1:
−	The '''Camintonn CMV-250''', '''CMV-500''', '''CMV-254''' and '''CMV-504''' are a series of [[QBUS]] memory cards, in dual QBUS card-size format, with capacities of 256 Kbytes, 512 Kbytes, 1 Mbyte and 2 Mbytes, respectively. They all use the same [[PCB]], and have capacities of 128-512 Kbytes when using 64Kx1 [[DRAM]]s, or 512 Kbytes - 2 Mbytes (using 256Kx1 DRAMs).	+	The '''Camintonn CMV-250''', '''CMV-500''', '''CMV-254''' and '''CMV-504''' are a series of [[QBUS]] memory cards, in [[DEC card form factor\|dual]] QBUS card-size format, with capacities of 256 Kbytes, 512 Kbytes, 1 Mbyte and 2 Mbytes, respectively. They all use the same [[PCB]], and have capacities of 128-512 Kbytes when using 64Kx1 [[DRAM]]s, or 512 Kbytes - 2 Mbytes (using 256Kx1 DRAMs).

	The board was normally sold with 1, 2, or 4 rows of chips. (Interestingly, there must be two ways to produce a CMV-500 - 1 row of 256Kx1 parts, or 4 rows of 64Kx1 parts. An example of the latter has not been spotted as of yet.)		The board was normally sold with 1, 2, or 4 rows of chips. (Interestingly, there must be two ways to produce a CMV-500 - 1 row of 256Kx1 parts, or 4 rows of 64Kx1 parts. An example of the latter has not been spotted as of yet.)

← Older revision	Revision as of 00:48, 14 December 2020
(No difference)

@@ Line 113: / Line 113: @@
 Available documentation describes them as "Starting and ending address boundary" (but without giving any detail as to their operation).
-On one version of the board, configured for 256Kx1 chips, it has jumpers on M-N, P-R, and etch cuts on R-S, N-O (which is likely the configuration for 64K chips' although this has not been verified).
+One version of the board, configured for 256Kx1 chips, has jumpers on M-N, P-R, and etch cuts on R-S, N-O (the inverse of which is likely the configuration for 64K chips, although this has not been verified).
 Another variant of the board, also using 256Kx1 chips, has a slightly different PCB (likely a later revision), and has no jumpers, but has etch connections M-N, P-R (note - the same as the previous board has jumpers).

@@ Line 2: / Line 2: @@
 The board was normally sold with 1, 2, or 4 rows of chips. (Interestingly, there must be two ways to produce a CMV-500 - 1 row of 256Kx1 parts, or 4 rows of 64Kx1 parts. An example of the latter has not been spotted as of yet.)
 ==Dual-chip capability==
@@ Line 11: / Line 109: @@
 MPR<br>NOS
-(Note that there is _another_ 'S' jumper on the board, at the top.)
+(Note that there is '''''another''''' 'S' jumper on the board, at the top.)
 Available documentation describes them as "Starting and ending address boundary" (but without giving any detail as to their operation).
@@ Line 18: / Line 116: @@
 Another variant of the board, also using 256Kx1 chips, has a slightly different PCB (likely a later revision), and has no jumpers, but has etch connections M-N, P-R (note - the same as the previous board has jumpers).