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- ID:EC EMS Boards: A comparison of features
- Quarterdeck Technical Bulletin # 235
- by Gary King
- last revision: 2 March 1992
-
- The following charts were created by Quarterdeck's Manifest program. Use
- these charts to form a comparison between the various 16 bit Expanded Memory
- Boards. These boards were tested in a true 8 mHz IBM AT with a VGA card and
- 256k of base motherboard memory. We decided to test only memory boards with
- the ability to map a substantial amount of memory below 640k. We did this
- because a board's ability to backfill memory and the motherboard's ability to
- disable base or conventional memory are the two features which enable DESQview
- to multitask using expanded memory.
-
- Here's a brief synopsis of the Manifest printouts:
-
- System/Config:
- An EMS manager is provided with all EMS boards. The EMS manager is a program
- that manages the expanded memory. Only when the memory is managed is it ready
- to be used by QRAM or DESQview. There may be additional parameters needed to
- fine tune the memory board's operation. We sometimes add parameters to the
- memory manager's line of the CONFIG.SYS, which will give some indication of
- how much effort is needed to configure your EMS Board. Consult the manual
- that came with the board or call the manufacturer to get information about
- additional parameters that can fine tune the EMS board. Fine tuning your
- memory manager can sometimes be beneficial to its operation, particularly when
- using QRAM or DESQview. The extra effort can reduce the memory overhead of
- the EMS board. The presence of QEXT.SYS, in this case, denotes the ability of
- the board to create some extended memory. QEXT.SYS will use this extended
- memory to create a high memory area or what is more commonly called the HMA -
- a very important feature for DESQview, DOS 5 and for other programs as well.
-
- Expanded/Overview:
- This gives you an idea of how capable the EMS board is. The version of EMS is
- important. It's one of the determining factors in how good your system's
- performance will be using DESQview or QRAM. The Expanded Memory Specification
- makes it possible for QRAM and DESQview to enhance your computer's
- performance. If the memory manager and board don't support this specification
- fully, QRAM and DESQview's capabilities will be limited. The PAGE FRAME
- indicates where the door to expanded memory starts. MAPPABLE PAGES shows how
- many memory addresses can be filled with expanded memory. QRAM uses this
- space above 640k to load device drivers and TSRs high. DESQview will also
- load itself into the memory above 640k when available. The amount below 640k
- determines how large the 2nd and 3rd or additional windows can be for a
- program running in DESQview. EMS HANDLES are created for programs requesting
- expanded memory. Each EMS request requires a handle. These handles may also
- be given a name to show what process is using EMS. REAL ALTERNATE MAPS are an
- advanced feature of EMS. They allow maps to be changed much faster. The idea
- is that the EMS manager can switch from one map to another in one operation,
- rather than one operation per mappable page. This significantly helps manage
- high speed communications and improves performance in multitasking
- environments.
-
- Expanded/Timings:
- These figures determine the access speed of your expanded memory relative to a
- PC/XT. This screen also shows speeds of different areas of EMS memory. Speeds
- will differ between boards. 16 bit access, the speed of the processor, the
- wait states built in the motherboard, the BUS speed are determining factors.
-
- Expanded/Pages:
- This is a graphical look at the boards EMS mapping ability. A + indicates the
- space has been made mappable by the memory manager. It's broken down in 64k
- segments for each line, (for example, 4000-4FFF hex), and each character is
- 16k or (for example, 4000-43FF hex). The area shown here reflects the memory
- space from 0k to 1024k or 0000-FFFF hex. As mentioned above, we only tested
- boards that have the capability to backfill conventional memory and since the
- EMS boards we tested have the ability to backfill, they make EMS memory
- available below 640k. Since DOS applications can only run in the first 640k,
- DESQview can use the backfilled EMS memory to make DOS programs think they're
- running in conventional memory, when actually, the DOS applications are being
- run in expanded memory. The PAGE FRAME is indicated by a series of four Fs
- and is required by most programs to use this memory. In these charts it's 64k
- in D000-DFFF hex. It needs to be placed in an otherwise unused portion of the
- address space. Usually it's placed somewhere between C000-EFFF; however this
- depends on the hardware configuration and the manufacturer. The IBM AT, along
- with most other clones, will not allow the E000-EFFF to be used.
-
- Expanded/Benchmarks:
- The timings here indicate the performance in the handling of the expanded
- memory calls. All rows of figures except the first row represent the time
- required to complete various EMS functions. The first row (Timer Interrupt
- Latency) indicates the amount of time that interrupts are locked during the
- different EMS functions. This is a good indication of the board's
- performance. In comparing boards, lower numbers are desirable for this field,
- since lower numbers indicate a board's ability to perform functions in a
- smaller or lower time frame.
-
- Dos/Drivers:
- The size of the driver indicated by EMMXXXX0 shows the amount of conventional
- memory used by the memory manager. Fine tuning the memory manager, as
- mentioned above, may alter the amount it uses.
-
- Summary:
- Each board is different in the way it implements EMS. Some will backfill as
- much conventional memory as the machine can disable; as little as 64k or as
- much as 640k. Some can't backfill at all. Others will only create a PAGE
- FRAME or map a small amount around it, if any at all. EMS 4.0 has many
- features, and it's up to the board manufacturer to determine which features
- will be supported. On a XT or AT computer, QRAM and DESQview are fully
- dependent on the degree of EMS support provided or the chip set used by
- manufacturer. If the EMS manager doesn't support a particular feature, then
- QRAM and DESQview will be unable utilize that feature.
-
- Name: INTEL ABOVE BOARD PLUS
-
- System / CONFIG
- DEVICE = C:\ABOARD\EMM.SYS AT 208 MC ND H=16
- FILES=20
- BUFFERS=20 Expanded / Timings
- DEVICE=QEXT.SYS Available Expanded Memory
- Speed PC/XT
- Expanded / Overview Size K/Sec Index
- EMS Version 4.0 1152K 2981 5.8
- Page Frame C800
- Mappable Pages 30
-
- Total Available
- Expanded Memory 1536K 1152K
- EMS Handles 16 15
- Real Alternate Maps 0 0
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 6 - 29
- 1n00 UUUU C800 - DFFF 96K 0 - 5
- 2n00 UUUU
- 3n00 UUUU
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++ Intel Corp.
- 7n00 ++++ (408) 765-8080
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 UUUU
- Cn00 UUFF
- Dn00 FF++ + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 925 74
- Map Single Page 75 80 78
- Real Alternate Map Set
- Save All - 30 pages 517 525 519
- Map Multiple - 30 pages 2304 2313 2308
- Restore All - 30 pages 1054 1067 1062
- Save Page Frame 136 143 139
- Restore Page Frame 134 140 136
- Open Handle - 4 pages 336 344 341
- Close Handle - 4 pages 222 231 227
- Open Handle - 31 pages 757 766 762
- Close Handle - 31 pages 414 421 418
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 0C45 - 0C66 0.5K QEXTXXX0 C
- 09B3 - 0C44 10K EMMXXXX0 C
-
-
- Name: STB RAPIDMEG
-
- System / CONFIG
- DEVICE=C:\STB\RAPIDMAP.SYS /I=4000-9FFF /i=B000-B7FF
- ... /E=128 /S=4000 /N=4 /T=1
- FILES=20
- BUFFERS=20 Expanded / Timings
- DEVICE=QEXT.SYS Available Expanded Memory
- Speed PC/XT
- Expanded / Overview Size K/Sec Index
- EMS Version 4.0 1536K 3724 7.2
- Page Frame C800
- Mappable Pages 32
-
- Total Available
- Expanded Memory 2048K 1536K
- EMS Handles 64 62
- Real Alternate Maps 0 0
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 8 - 31
- 1n00 UUUU B000 - B7FF 32K 6 - 7
- 2n00 UUUU C800 - DFFF 96K 0 - 5
- 3n00 UUUU
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++ STB Systems, Inc.
- 7n00 ++++ (214) 234-8750
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UUFF
- Dn00 FF++ + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 2998 381
- Map Single Page 111 117 115
- Real Alternate Map Set
- Save All - 32 pages 134 139 136
- Map Multiple - 32 pages 3031 3041 3036
- Restore All - 32 pages 441 451 445
- Save Page Frame 94 98 96
- Restore Page Frame 161 165 161
- Open Handle - 4 pages 132 137 133
- Close Handle - 4 pages 126 132 129
- Open Handle - 31 pages 130 136 132
- Close Handle - 31 pages 129 132 130
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 0C75 - 0C96 0.5K QEXTXXX0 C
- 09B3 - 0C74 11K EMMXXXX0 CS
-
-
- Name: NEWER CONCENTRATION
-
- System / CONFIG
- DEVICE = C:\CONCEMM.SYS /FD000 /B256 /PC800,CC00,B000
- ...,B400 /M4096 /L3968
- FILES=20
- BUFFERS=20 Expanded / Timings
- DEVICE=QEXT.SYS Available Expanded Memory
- Speed PC/XT
- Expanded / Overview Size K/Sec Index
- EMS Version 4.0 3584K 2981 5.8
- Page Frame D000
- Mappable Pages 32
-
- Total Available
- Expanded Memory 3968K 3584K
- EMS Handles 64 63
- Real Alternate Maps 3 3
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 8 - 31
- 1n00 UUUU B000 - B7FF 32K 6 - 7
- 2n00 UUUU C800 - CFFF 32K 4 - 5
- 3n00 UUUU D000 - DFFF 64K 0 - 3
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++
- 7n00 ++++ Newer Technology
- 8n00 ++++ (800) 678-DRAM
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UU++
- Dn00 FFFF + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 1197 104
- Map Single Page 130 137 133
- Real Alternate Map Set 80 85 83
- Save All - 32 pages 1286 1297 1290
- Map Multiple - 32 pages 5269 5294 5282
- Restore All - 32 pages 881 888 885
- Save Page Frame 223 232 227
- Restore Page Frame 173 178 176
- Open Handle - 4 pages 599 613 608
- Close Handle - 4 pages 647 655 650
- Open Handle - 31 pages 1177 1191 1183
- Close Handle - 31 pages 1078 1087 1083
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 0D66 - 0D87 0.5K QEXTXXX0 C
- 09B3 - 0D65 14K EMMXXXX0 C
-
-
- Name: EVEREX RAM 8000 AT
-
- System / CONFIG
- DEVICE C:\EVEREX\EMM.SYS /H:16 /I:B000-B7FF
- FILES=20
- BUFFERS=20
- DEVICE=QEXT.SYS Expanded / Timings
- Available Expanded Memory
- Expanded / Overview Speed PC/XT
- EMS Version 4.0 Size K/Sec Index
- Page Frame C800 1520K 1061 2.0
- Mappable Pages 32
-
- Total Available
- Expanded Memory 1520K 1520K
- EMS Handles 16 15
- Real Alternate Maps 127 127
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 8 - 31
- 1n00 UUUU B000 - B7FF 32K 4 - 5
- 2n00 UUUU C800 - D7FF 64K 0 - 3
- 3n00 UUUU D800 - DFFF 32K 6 - 7
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++ Everex Systems, Inc.
- 7n00 ++++ (415) 498-1111
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UUFF
- Dn00 FF++ + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 1245 209
- Map Single Page 160 168 164
- Real Alternate Map Set 562 565 563
- Save All - 32 pages 1345 1365 1351
- Map Multiple - 32 pages 4459 4471 4464
- Restore All - 32 pages 1337 1353 1345
- Save Page Frame 218 226 222
- Restore Page Frame 218 223 222
- Open Handle - 4 pages 149 153 151
- Close Handle - 4 pages 732 738 735
- Open Handle - 31 pages 287 290 290
- Close Handle - 31 pages 729 735 732
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 09D5 - 0BCA 7.8K EMMXXXX0 C
- 09B3 - 09D4 0.5K QEXTXXX0 C
-
-
- Name: COMPUTER PERIPHERALS CPI-XMA
-
- System / CONFIG
- Device=qext.sys
- DEVICE=C:\HIGHFI\XMAEMS40.SYS /D0,D4,D8,DC,B0.B4,C8,CC
- FILES=20
- BUFFERS=20 Expanded / Timings
- Available Expanded Memory
- Expanded / Overview Speed PC/XT
- EMS Version 4.0 Size K/Sec Index
- Page Frame D000 3712K 1060 2.0
- Mappable Pages 32
-
- Total Available
- Expanded Memory 4096K 3712K
- EMS Handles 64 63
- Real Alternate Maps 15 15
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 8 - 31
- 1n00 UUUU B000 - B7FF 32K 4 - 5
- 2n00 UUUU C800 - CFFF 32K 6 - 7
- 3n00 UUUU D000 - DFFF 64K 0 - 3
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++
- 7n00 ++++ Computer Peripherals, Inc.
- 8n00 ++++ (805) 499-5751
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UU++
- Dn00 FFFF + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 3499 430
-
- Map Single Page 156 231 192
- Real Alternate Map Set 67 75 70
- Save All - 32 pages 448 457 452
- Map Multiple - 32 pages 3848 3881 3865
- Restore All - 32 pages 872 880 876
- Save Page Frame 297 305 302
- Restore Page Frame 190 196 192
- Open Handle - 4 pages 160 165 161
- Close Handle - 4 pages 277 285 281
- Open Handle - 31 pages 490 498 495
- Close Handle - 31 pages 794 802 798
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 09B3 - 0BB4 8K EMMXXXX0 C
-
-
- Name: AST RAMPAGE PLUS 286
-
- System / CONFIG
- DEVICE=C:\RAMPAGE\REMM.SYS /L=B000-B7FF /P=16 /C=16
- FILES=20
- BUFFERS=20 Expanded / Timings
- DEVICE=QEXT.SYS Available Expanded Memory
- Speed PC/XT
- Expanded / Overview Size K/Sec Index
- 3584K 1061 2.0
- EMS Version 4.0 and EEMS 3.2
- Page Frame C800
- Mappable Pages 32
-
- Total Available
- Expanded Memory 3968K 3584K
- EMS Handles 16 15
- Real Alternate Maps 23 23
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 6 - 29
- 1n00 UUUU B000 - B7FF 32K 30 - 31
- 2n00 UUUU C800 - DFFF 96K 0 - 5
- 3n00 UUUU
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++ AST Research, Inc.
- 7n00 ++++ (714) 863-1333
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UUFF
- Dn00 FF++ + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 3869 728
-
- Map Single Page 160 168 162
- Real Alternate Map Set 137 143 139
- Save All - 32 pages 892 906 899
- Map Multiple - 32 pages 3341 3360 3351
- Restore All - 32 pages 849 858 853
- Save Page Frame 252 259 255
- Restore Page Frame 241 245 242
- Open Handle - 4 pages 1644 1659 1652
- Close Handle - 4 pages 729 736 732
- Open Handle - 31 pages 4081 4099 4090
- Close Handle - 31 pages 1604 1615 1608
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 0C09 - 0C2A 0.5K QEXTXXX0 C
- 09B3 - 0C08 9.3K EMMXXXX0 C
-
-
- Name: TELETEK X-BANDIT
-
- System / CONFIG
- DEVICE=C:\TELETEK\TEMM16.SYS /F:D000 /E /V /T:128
- FILES=20
- BUFFERS=20 Expanded / Timings
- DEVICE=QEXT.SYS Available Expanded Memory
- Speed PC/XT
- Expanded / Overview Size K/Sec Index
- EMS Version 4.0 and EEMS 3.2 1536K 2978 5.7
- Page Frame D000
- Mappable Pages 32
-
- Total Available
- Expanded Memory 1920K 1536K
- EMS Handles 255 254
- Real Alternate Maps 7 7
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 8 - 31
- 1n00 UUUU B000 - B7FF 32K 4 - 5
- 2n00 UUUU C800 - CFFF 32K 6 - 7
- 3n00 UUUU D000 - DFFF 64K 0 - 3
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++
- 7n00 ++++ Teletek Enterprises, Inc.
- 8n00 ++++ (916) 920-4600
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UU++
- Dn00 FFFF + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 117 4
- Map Single Page 303 418 360
- Real Alternate Map Set 172 174 173
- Save All - 32 pages 257 264 260
- Map Multiple - 32 pages 14353 14404 14381
- Restore All - 32 pages 4758 4776 4768
- Save Page Frame 423 430 426
- Restore Page Frame 727 738 735
- Open Handle - 4 pages 1271 1283 1276
- Close Handle - 4 pages 315 321 318
- Open Handle - 31 pages 3288 3301 3294
- Close Handle - 31 pages 1519 1529 1522
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 0FB2 - 0FD3 0.5K QEXTXXX0 C
- 09B3 - 0FB1 23K EMMXXXX0 C
-
-
- Name: ALL CHARGECARD
-
- System / CONFIG
- DEVICE=QEXT.SYS
- DEVICE=C:\ALL26\ALLEMM4.SYS HA=16
- FILES=20
- BUFFERS=20 Expanded / Timings
- Available Expanded Memory
- Expanded / Overview Speed PC/XT
- Size K/Sec Index
- EMS Version 4.0 3584K 2976 5.7
- Page Frame E000
- Mappable Pages 48
-
- Total Available
- Expanded Memory 4224K 3584K
- EMS Handles 16 15
- Real Alternate Maps 8 8
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 1000 - 9FFF 576K 12 - 47
- 1n00 ++++ B000 - B7FF 32K 4 - 5
- 2n00 ++++ C800 - DFFF 96K 6 - 11
- 3n00 ++++ E000 - EFFF 64K 0 - 3
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++
- 7n00 ++++ All Computers Inc.
- 8n00 ++++ (416) 960-0111
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UU++
- Dn00 ++++ + = Mappable
- En00 FFFF F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 30 3
- Map Single Page 140 155 146
- Real Alternate Map Set 99 104 101
- Save All - 48 pages 151 156 153
- Map Multiple - 41 pages 6029 6049 6043
- Restore All - 48 pages 1581 1586 1583
- Save Page Frame 83 91 87
- Restore Page Frame 290 297 294
- Open Handle - 4 pages 108 115 112
- Close Handle - 4 pages 127 132 129
- Open Handle - 31 pages 215 219 216
- Close Handle - 31 pages 239 248 244
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 09D5 - 0CD0 11K EMMXXXX0 C
- 09B3 - 09D4 0.5K QEXTXXX0 C
-
-
- Name: MICRON BEYOND 640
-
- System / CONFIG
- DEVICE=C:\QEXT.SYS
- FILES=20 Expanded / Timings
- BUFFERS=20 Available Expanded Memory
- DEVICE=C:\MICRON\MEMM40.SYS Speed PC/XT
- Size K/Sec Index
- Expanded / Overview 3584K 2975 5.7
- EMS Version 4.0
- Page Frame D000
- Mappable Pages 28
-
- Total Available
- Expanded Memory 3968K 3584K
- EMS Handles 64 63
- Real Alternate Maps 0 8
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 4 - 27
- 1n00 UUUU D000 - DFFF 64K 0 - 3
- 2n00 UUUU
- 3n00 UUUU
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++ Micron Technology, Inc.
- 7n00 ++++ (208) 386-3900
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 UUUU
- Cn00 UUUU
- Dn00 FFFF + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 8773 2128
- Map Single Page 370 378 374
- Real Alternate Map Set 1342 1362 1352
- Save All - 28 pages 199 208 204
- Map Multiple - 28 pages 8754 8962 8811
- Restore All - 28 pages 6670 6870 6729
- Save Page Frame 160 166 163
- Restore Page Frame 764 962 818
- Open Handle - 4 pages 256 263 261
- Close Handle - 4 pages 1342 1352 1347
- Open Handle - 31 pages 261 263 261
- Close Handle - 31 pages 1345 1349 1346
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- 09D5 - 0EF1 20K EMMXXXX0 C
- 09B3 - 09D4 0.5K QEXTXXX0 C
-
-
- Name: Turbo EMS
- System / CONFIG
- DEVICE=C:\turbo\VEM.SYS /D=X=110000 /M=92 /A=H /L=16
- files=20
- buffers=20 Expanded / Timings
- device=qext.sys Available Expanded Memory
- Speed PC/XT
- Size K/Sec Index
- Expanded / Overview 1472K 2977 5.7
- EMS Version 4.0
- Page Frame 9000
- Mappable Pages 4
- Total Available
- Expanded Memory 1472K 1472K
- EMS Handles 17 16
- Real Alternate Maps 0 0
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 9000 - 9FFF 64K 0 - 3
- 1n00 UUUU
- 2n00 UUUU
- 3n00 UUUU
- 4n00 UUUU
- 5n00 UUUU
- 6n00 UUUU Lantana Technology
- 7n00 UUUU (619) 565-0798
- 8n00 UUUU
- 9n00 FFFF
- An00 UUUU
- Bn00 UUUU
- Cn00 UUUU
- Dn00 UUUU + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 9301 2564
- Map Single Page 231 10226 2166
- Real Alternate Map Set
- Save All - 4 pages 162 165 164
- Map Multiple - 4 pages 320 10333 5216
- Restore All - 4 pages 3622 10945 9242
- Save Page Frame 279 287 284
- Restore Page Frame 847 10836 9027
- Open Handle - 4 pages 161 165 163
- Close Handle - 4 pages 333 345 338
- Open Handle - 31 pages 173 180 178
- Close Handle - 31 pages 517 526 520
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- NUL IBMDOS C N
- 09D5 - 0BCB 7.9K EMMXXXX0 CS
- 09B3 - 09D4 0.5K QEXTXXX0 C
-
-
- Name: SIMMply-RAM
- System / CONFIG
- device=c:\qext.sys
- device=c:\ramutil\mm.sys /l=b000-b7ff
- buffers=20
- files=30 Expanded / Timings
- Available Expanded Memory
- Speed PC/XT
- Size K/Sec Index
- Expanded / Overview 1536K 1061 2.0
- EMS Version 4.0
- Page Frame C800
- Mappable Pages 32
-
- Total Available
- Expanded Memory 1920K 1536K
- EMS Handles 255 254
- Real Alternate Maps 15 15
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 6 - 29
- 1n00 UUUU B000 - B7FF 32K 30 - 31
- 2n00 UUUU C800 - DFFF 96K 0 - 5
- 3n00 UUUU
- 4n00 ++++
- 5n00 ++++ AccuLogic
- 6n00 ++++ (800) 234-7811
- 7n00 ++++
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UUFF
- Dn00 FF++ + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 7945 2099
- Map Single Page 199 205 202
- Real Alternate Map Set 115 120 118
- Save All - 32 pages 2144 2159 2150
- Map Multiple - 32 pages 4731 4750 4741
- Restore All - 32 pages 3420 3432 3426
- Save Page Frame 372 381 377
- Restore Page Frame 518 525 521
- Open Handle - 4 pages 1639 1654 1646
- Close Handle - 4 pages 7449 7458 7454
- Open Handle - 31 pages 4078 4094 4085
- Close Handle - 31 pages 8325 8337 8330
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- NUL IBMDOS C N
- 0D2A - 0D8C 1.5K CON C x OI
- 09B3 - 0D29 13K EMMXXXX0 C
-
-
- Name: Ramflex Mini
-
- System / CONFIG
- Device=c:\qext.sys Expanded / Timings
- DEVICE=C:\IMM4_DOS.SYS Available Expanded Memory
- Files=20 Speed PC/XT
- Buffers=20 Size K/Sec Index
- 1664K 2963 5.7
- Expanded / Overview
- EMS Version 4.0
- Page Frame C800
- Mappable Pages 30
-
- Total Available
- Expanded Memory 2048K 1664K
- EMS Handles 255 254
- Real Alternate Maps 63 63
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 6 - 29
- 1n00 UUUU C800 - DFFF 96K 0 - 5
- 2n00 UUUU
- 3n00 UUUU
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++ Computer Elektronik Infosys
- 7n00 ++++ (703)435-3800
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 UUUU
- Cn00 UUFF
- Dn00 FF++ + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 671 45
-
- Map Single Page 79 86 84
- Real Alternate Map Set 68 73 70
- Save All - 30 pages 325 332 329
- Map Multiple - 30 pages 1474 1487 1481
- Restore All - 30 pages 331 338 334
- Save Page Frame 91 96 94
- Restore Page Frame 158 163 160
- Open Handle - 4 pages 79 84 81
- Close Handle - 4 pages 89 95 91
- Open Handle - 31 pages 79 84 80
- Close Handle - 31 pages 90 94 91
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- NUL IBMDOS C N
- 09B3 - 0C66 10K EMMXXXX0 C
-
-
- Name: Ram 3000
- System/Config
- Device=c:\evems\ems.sys d000 /x=b000-b7ff
- device=c:\qext.sys
- files=25 Expanded / Timings
- buffers=20 Available Expanded Memory
- Speed PC/XT
- Size K/Sec Index
- 496K 2964 5.7
- Expanded / Overview
- EMS Version 4.0
- Page Frame C800
- Mappable Pages 32
-
- Total Available
- Expanded Memory 880K 496K
- EMS Handles 64 63
- Real Alternate Maps 127 127
-
-
- Expanded / Pages
- n=048C Memory Area Size Logical Page
- 0n00 UUUU 4000 - 9FFF 384K 8 - 31
- 1n00 UUUU B000 - B7FF 32K 4 - 5
- 2n00 UUUU C800 - D7FF 64K 0 - 3
- 3n00 UUUU D800 - DFFF 32K 6 - 7
- 4n00 ++++
- 5n00 ++++
- 6n00 ++++ Everex Systems, Inc.
- 7n00 ++++ (415) 498-1111
- 8n00 ++++
- 9n00 ++++
- An00 UUUU
- Bn00 ++UU
- Cn00 UUFF
- Dn00 FF++ + = Mappable
- En00 UUUU F = Page Frame
- Fn00 UUUU U = Unmappable
-
- Expanded / Benchmark
- (times in microseconds)
- EMS Function Minimum Maximum Average
- Timer Interrupt Latency 0 1290 168
- Map Single Page 165 171 169
- Real Alternate Map Set 509 515 512
- Save All - 32 pages 1393 1402 1397
- Map Multiple - 32 pages 4397 4414 4405
- Restore All - 32 pages 1342 1348 1344
- Save Page Frame 230 238 233
- Restore Page Frame 225 230 228
- Open Handle - 4 pages 152 160 156
- Close Handle - 4 pages 745 755 750
- Open Handle - 31 pages
- Close Handle - 31 pages
-
- DOS / Drivers
- Attributes
- Memory Area Size Driver Program CSBxRxxxxLxxKNOI
- NUL IBMDOS C N
- 0AC1 - 0DC1 12K EMMXXXX0 C
- 09F3 - 0AC0 3.2K QEXTXXX0 C
-
- ************************************************************************
- *This technical note may be copied and distributed freely as long as it*
- *is distributed in its entirety and it is not distributed for profit. *
- * Copyright (C) 1989-92 by Quarterdeck Office Systems *
- ************************ E N D O F F I L E *************************
-