So just out of curiosity has anyone ever tried larger drams in the Intel Above Board AT the specs say that memory map settings indicate 256 x 1 drams for a total of 2mb without daughter board... I was wondering is there any reason one couldn't pop in some 1m x 1 drams of compatible timing? Even if it only uses 256 Kbit of each 1 Mbit chip in theory they should still work right? Also does anyone have the daughter card that they could manage to get some close up HIRes pictures of all the trace routings and components for me? It is absurd that so many of these cards are in circulation and no one has cloned the daughterboard for all those who do not have one... There are cloned parts for the imsai and kim1 surely this isn't too much too ask... 🤣

Predator99 wrote on 2018-10-06, 10:00:

In the mean time I had some time and decoded the DIPs for the "FIF48G PE505-16M" - inserted above. […]
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In the mean time I had some time and decoded the DIPs for the "FIF48G PE505-16M" - inserted above.

In this pile
Bought these (retro) hardware today

I got another card.

IMG_9749r.jpg
IMG_9754r.jpg

Its totally no-name ("CE 49107"?) and has 1 bank of 4164 chips on it (=64 kb). 6 banks in total, are 3MB if filled with 256k chips.
1 DIP block with 6 switches (JP1), another one with 8 switches (JP2).

Replaced the 64k with 256k chips and...:

JP1 has no impact on XMS. (Set to 12345x)

JP2:
1234x6xx 9,5
x234x6xx 9,5
12345xxx 9,0
1234xxxx 8,5
xxx456x8 6,0
x2x4567x 4,0
x2x4x67x 3,5
x2x456xx 2,0
xxx456xx 2,0
xxx45xxx 1,0
x2x45xxx 1,0
12x45xxx 1,0
12x4x6xx 1,5
123xxxxx 512
x2x4x678 above 6mb
xx345xxx above 6mb

--> working 😎 😎 😎

____
EDIT:
SW 1,2: seem to have no impact? Set to OFF.
SW 4: set to ON ...otherwise counting at POST stops below 1024k
SW 35678: see below

Still need to figure out how to set steps at 128/256/384 kb. Should be related to SW 1,2,4,5.

0M 512K --- SW35678
1M 0K --- x5xxx verified
1M 512K --- xx6xx verified
2M 0K --- x56xx verified
2M 512K --- xxx7x
3M 0K --- x5x7x
3M 512K --- xx67x verified
4M 0K --- x567x verified
4M 512K --- xxxx8
5M 0K --- x5xx8
5M 512K --- xx6x8
6M 0K --- x56x8 verified
6M 512K --- xxx78
7M 0K --- x5x78
7M 512K --- xx678
8M 0K --- x5678
8M 512K --- 3xxxx verified
9M 0K --- 35xxx verified
9M 512K --- 3x6xx verified
10M 0K --- 356xx
10M 512K --- 3xx7x
11M 0K --- 35x7x
11M 512K --- 3x67x
12M 0K --- 3567x
12M 512K --- 3xxx8
13M 0K --- 35xx8
13M 512K --- 3x6x8
14M 0K --- 356x8
14M 512K --- 3xx78
15M 0K --- 35x78

So is this a card that you have been waiting a long time for, or just something you happened upon whilst traveling the intersurf? I am asking because I would love to pursuade you to sell it, I have been looking for a single 16mb memory expansion card for an IBM AT forever I currently have 10mb between an impractical 2 card multi i/o solution, but I would love to have all the memory one a single card with the entirety of the slot dedicated to just the memory no multi i/o... I had been looking for a card that took simms, but if it is 16 meg I am happy with drams. Win 95 is slow enough on any AT class machine, but with under 16mb it is Ben Steindows.

These cards are mainly for 286s...its new to me Win95 runs on such a CPU?
The card you are asking for will take up to 2.5 MB but not 16 MB...

I have referred to this post many times, has this information/ thread been stickied and added to a wiki?

I hadn't realised that I didn't post in this thread, but here is another Everex card, the EV-178:

It supports up to 8MB (of exclusively EMS, I believe), and is enabled by the attached driver.

There is a 4 way dip switch block, which is explained by the interactive setup tool:

Driver and setup utility are here below. Note that the setup utility must be run in order to configure the card hardware for the current installed amount of memory - it doesn't appear to be possible to configure via physical jumpers.

In addition, there are two jumpers on the board which I do not currently have any documentation for. Otherwise the driver works perfectly and adds 8MB EMS to be 286 systems.

TTI 8644
Cards does not look like that...but it works. I have 2 of them and both behave the same. With the configuration shown on the photo it adds 512 kb to an IBM AT with 512 kb on board resulting in 1 MB in total.
I tried around 10 settings and didnt manage it to set a starting adress above 1MB. So this card seems to be like the "G-9 SIX PAK PLUS" which fills the memory below 1MB:
https://stason.org/TULARC/pc/memory-cards/AST … X-PAK-PLUS.html
Maybe I investigate this in the future but at the moment I do not see a reason to use such card...

Populating hardware UMB on a device that otherwise lacks them (or performing surgery to add a banking latch and mapper chip, to turn it into a hardware EMS card) are both valid, IMO.

286 (which cant exit flat mode once entered (cleanly!)) With DOS 6.22, and cdrom/nic drivers, for instance.

Purposefully NOT POPULATING certain chip slots (driven by option roms in other cards) to avoid bus being driven, with other areas left populated, and the use of hiram to turn it on for UMB use, for instance.

Another 'bastard' use might be putting PROM chips of appropriate density in certain areas, and using it to store a custom option rom (xtide, pxe, etc)

Next card. Manufacturer is "CEI", see also here
Unkown ISA-Cards
Quite surprising I didnt find anything about it:

EDIT: I think its the "Computer Elektronik Infosys of America Inc" "RAMFlex"
https://archive.org/details/PC-Mag-1989-12-12 … e/2up?q=infosys
https://books.google.de/books?id=JzoEAAAAMBAJ … ownload&f=false

It can hold 8 MB and has 3 DIP blocks, A(6)-B(8)-C(8) from left to right.

Already found out block C is for setting the starting adress. Blocks A+B should be set as shown in above picture:
12345678 DIP Mem Start
00000111 1
00001000 1,128
00001001 1,256
00001111 2
00010001 2,256
00011000 3,128
00011101 3,768
00011111 4
00100000 4,128
00100001 4,256
01000001 8,256
10011101 3,768
00011101 3,768

It seems DIP 1 doesnt matter.
DIP 2 add 8192k
DIP 3 adds 4096k
DIP 4 adds 2048k
DIP 5 adds 1024k
DIP 6 adds 512k
DIP 7 adds 256k
DIP 8 adds 128k
The calculation doesnt fit 100%. Maybe its related to fact that the board I am testing with has only 512kb onboard. With the setting "00000111" the additional RAM is detected by the BIOS.

Some work remaining here. There will also be a setting for the RAM size. And also for EMS with I/O port and page frame.

Found..would be really nice to get the drivers....