Microware Computing Services (MW006) card - what is it?

[coolchilli]

Hi - I've recently acquired a collection of TRS-80 (Model I) software, and in the box was a card which has "Microware Computing Services (c) 1981" printed on top, and "MW006 SIDE A" printed on the underneath side.

There are a number of chips on the board, which I can identify as:

SN74LS74AN
TMM314APL-1 x4 (16K RAM?)
HD74LS157P
SN74LS138N

and what looks like a ROM with "SETXY DISK" on a sticker on top

Can anyone help me confirm this is indeed an add-on for the TRS-80, and what it is? I'd have guessed on a disc interface, but given this is built into the Expansion unit, then I'm at a bit of a loss as to what it might be...

 

[kiwisincebirth]

providing photographs might be helpful.

 

[AaronBrockbank]

Could it be this:

Model I High Resolution Graphics - jmp start ;microcomputers

The machine came with a high-resolution add-on / modification by Microware Computing Services. It seems to be an unusual thing and is probably of limited use but is interesting nevertheless. The Model I in its base form allocates 6 bits for each character on its 64 x 16 character display. Each...

www.jmpstartmicrocomputers.au

SN74LS74AN is a dual type D flip flop.
TMM314APL-1 is a 1024 x 4 RAM, so this would be the 2K in the Microware Hugh Resolution Graphics.
HD74LS157P is a quadruple 2-line-to-1-line Data Selector.
SN74LS138N is a 3 to 8 bit decoder/demultiplexer.

The EPROM fulfills the role of the ROM when the high resolution mode is off.

There should also be a small daughterboard that fits inside the Model 1 (and replaces the Character Masked ROM).

 

[coolchilli]

Hey all - so sorry, I thought I had included photos with my original post. my bad (and rectified now)!

From the description of the blog above, this does indeed seem to be the Model I High Resolution Graphics mod. Sadly though, I have no daughterboard inside the Model I or the expansion unit.

Thanks for the responses, and great detective work, especially with my failure of photos with the original post