VOGONS


First post, by FlashCade

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Hello everyone, I would like to understand with your help if I need, as I believe, to install the Lo-tech 1MB Ram card on my old ps/2 8530 (8086/Nec v30) to be able to increase ram and use the Upper memory part with the program umb!umbs.
Analyzing the memory with various diagnostic utilities I thought to have available the memory between D000 and F000, but the program Test!umbs does not find available memory and running in autoexec the program use!umb (1.9) the PC crashes.
The motherboard has 2 simm 30 pins of 256 kb (512) but the ram available to the system is 640, so I think that another 128 kb are on a chip installed on the mobo, in addition to the 64 kb of the bios and those of the video card.
Does anyone have any advice to give me? Is it possible to load with an XT the command.com in this upper memory area ?
Thank you!

UMBS unused.PNG
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UMBS unused.PNG
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527.29 KiB
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279 views
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Fair use/fair dealing exception
UMBS unused_1.PNG
Filename
UMBS unused_1.PNG
File size
898.79 KiB
Views
279 views
File license
Fair use/fair dealing exception

IBM Ps-2 model 30 (8086 / Nec v30) - Tridend 8900d 1024 ram - floppy 720 kb - HDD 20 Mb (KO) - XT CF-Lite v4.1 with 1GB CF Microdrive IBM

Reply 2 of 2, by FlashCade

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I should buy the card, before doing so I wanted to see if I actually needed it.
The programs I used, besides the test!umb included with the use!umbs program are: checkit3 - manifest 1.10.
For the program in qbasic unfortunately I can not create it, but thank you for the advice.

IBM Ps-2 model 30 (8086 / Nec v30) - Tridend 8900d 1024 ram - floppy 720 kb - HDD 20 Mb (KO) - XT CF-Lite v4.1 with 1GB CF Microdrive IBM