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NeXT
April 7th, 2014, 08:38 PM
I purchased it for $10 from a guy in Oregon last summer and all this time it's been collecting dust because I'm having a lot of trouble finding much information on it.

http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/IMG_5836.jpg

This is what an assembled kit looks like:
http://upload.wikimedia.org/wikipedia/en/d/d6/MAYYA_51A.jpg

Aside from the keyboard and display I am missing a lot of components and with no parts list I can't determine what components I'm still missing or where to find images of the ROM monitor. I really want to play with this and get the teletype interface working but I really need help.

gslick
April 7th, 2014, 09:05 PM
Did you look here?

http://www.bitsavers.org/pdf/intel/8051/SDK-51/

I have a complete one. The monitor is contained in two 2732 EPROMs. I should be able to extract a binary image.

One issue though is the 8041 for keyboard and UART control. If it was an 8741 I think I could dump that to program another 8741, but mine has an 8041 and I'm not sure if its ROM can be dumped.

Ok, looks like the 8041 has a ROM verification mode and I think that is supported by my device programmer so I might be able to dump that too and it could be programmed into an 8741.

NeXT
April 8th, 2014, 06:32 PM
Did you look here?

http://www.bitsavers.org/pdf/intel/8051/SDK-51/
Nope. :oops: Well there's the schematic and assembly guide I was looking for but yeah, if you can find a way to dump the ROM and 8041 I should be okay so long as I can find a way to substitute the keyboard.

gslick
April 8th, 2014, 09:08 PM
In addition to U7 - 8031, U64 - 8155, U41 - 8041A/8741A, U59 - 2732A, U60 - 2732A, you are also missing U63 - 3622A (512x4 PROM). The PROM is used as part of the breakpoint logic as described in the Instruction Cycle (INSCYC) Circuit section of the sdk-51_users_guide_121588-002.pdf manual on page 3-14.

I was able to dump the contents of the 8041A, the two 2732A EPROMs, plus the 512x4 PROM. I can send those binaries to you in email. If Al happens to read this and wants a copy for the Bitsavers archive that would be cool too.

From some quick spot checks the EPROM contents appears to match the SDK-51 Monitor Version 1.03 and Assembler/Disassembler listing in the sdk-51_monitor_listing_121590-003.pdf manual.

(And you're also missing the three HDSP-6300 displays and AC5947N 18-segment display driver and other miscellaneous components on the display board).

NeXT
April 9th, 2014, 05:28 PM
Yeah, I'm considering just forgetting the display if I can live directly off the terminal interface. As cool as it would be, I'm simply missing too many components to make it an otherwise complete kit.
I've sent you a PM.

gslick
July 20th, 2015, 06:43 AM
I was able to dump the contents of the 8041A, the two 2732A EPROMs, plus the 512x4 PROM. I can send those binaries to you in email.

From some quick spot checks the EPROM contents appears to match the SDK-51 Monitor Version 1.03 and Assembler/Disassembler listing in the sdk-51_monitor_listing_121590-003.pdf manual.


Someone asked for a copy of these bits so I'll go ahead and post them here in case anyone else wants them too.

-Glen

1,024 U41-8041A.BIN
4,096 U59-E000.BIN
4,096 U60-F000.BIN
512 U63-3622A.BIN

25399