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As far as communication standard the System 36 supports that is listed in its manuals. The system supports : Async Formats formats, Sync Communication Formats in either ASCII or EBCDIC formats through its existing serial communication ports. To support others like AES Data format, Sinclair QL...

In your System/36 model 5363 message, it doesn't state much about the system configuration. So any forum reader, should take it that the system is configured in its default state. AKA, as in a IBM AD for that model. Your message doesn't state a II, III version so we should interpret this as a I...

I wasn't going to reply to this entry but I decided may I should as others haven't. .. You should also look at the ROM memory paging system that the AURORA card used. The old SUN 1 and 2 workstation logic designs is worth looking at if you can find a extended memory board schematic for one...

Ha if you have an external Quest made QL Firefly Hard drive and or a Quest made OScard then please message me directly. .. I had a Sinclair QL computer for years now and once used it lots, but it has been pack away for several years now. Mostly do the cost of upgrading the unit and finding the...

YA, to use a Super I/O chip from an Intel based PC clone would be the ideal way to go. Easy to interface to other microprocessors and should still be easy to get a hold of (in small quantiles). .. As far as an expansion bus standard for a updated QL clone, there is some decisions to be made...

The standard IBM PC and PCXT use the following addresses for the NPU addressing (in Hex format) 0F0 Clears Math Coprocessor Busy Signal 0F1 Resets Math Coprocessor --------------------------------------- 0F2 reserved 0F3 reserved 0F4 reserved 0F5 reserved 0F6 reserved 0F7 reserved * 0F8 to 0FF...

The Modify Int.. Vector is not the same one that used to modify the 100A to a 100B Level. For this revision I can longer find the modified BIOS ROM of the Darkweb for it.

The Memory Adapter with the optional 8087 Option pictures I originally uploaded, could be different then the ones that BIGFIX provided in there uploaded documentation. Some boards have a 541634-X-X-cX number. .. For those forum users that are following this set of messages just so you know that...

After 48 years, Zilog is killing the classic standalone Z80 microprocessor chip (official notice was issued April 14 of this year) The discontinuation list provided by Zilog in its letter includes 13 products from the Z84C00 series, .. Who knows how long before they the end the Z80380...

Aileen Rainbow 100 hardware Dec. supposed to designed a Ethernet board for the RB100 computer as well. If you Dec. Documentation has ant 3RD parity cards for the RB100 computer that would be interesting as well. .. Well that is all for now.

Due to (PDF) size restrictions with this host for uploading files , you could try the https://www.ilovepdf.com/compress_pdf online utilities. Some other PDF software from none Adobe will let you save the PDF as an older version thus reducing its file size as well. In some cases the PDF in it is...

Right On another missing schematic diagram has been found, No more manually redrawing out the PC100A 8087/Memory adapter module with all the IC Installed. This should help speed up NA103 progress and other who want to recreate that adapter. .. As NA103 states send picture of everything you find...

Ya the BIOS memory set-up settings in 100A become irrelevant when a 100B memory is installed via the 8087 adapter on the Rainbow 100A and the MEM PRES remains high. But I I have already noted that I have other none memory expansion cards for the 100A that use the Memory Expansion Connector. So I...

Thanks for uploading some pictures/photos of the 4959 and other etc. If the card slots on the 4959 all have some dust on them then likely there was no cards in them. If one or more Card slots are cleaner then there was likely a card in them. As for the card that would depend on who had the...

I have looked at your bate/rough outline board their is a couple of things I would have done differently. There is no MMU logic on it to properly decode the upper address range, you could always wire this bank into an I/O address ranger to select it this will stop conflicts with the systems...

Ideally I would make the Memory expansion board work with both models with just one jumper. (Some newer 3RD party IO board for this machine that use the memory expansion have the jumper for that purpose). On the memory expansion card pin 29 Memory Option Present is pulled low with a 100A memory...

I have attached the Intel x86 and/or x88 minimum mode Hold and Hold Ack to RQ and GR conversion Circuit. This circuit some 3 rd party used to help attached the 8087 NPU to a 8085 and other microprocessors. My-Issues_wAdda8087 has the hidden Microprocessor bus Status Cycles that most...

It is possible to hotwire the 4959 i/O expansion Module so it will work without its bus expansion card, but some peripherals wont work when that done, without hotwiring some components. As far as expansion card that where in a 4959 i/O expansion Module they where mostly client/customer related...