Re: RCA COSMAC MS2000 MicroDisk Development System

On with the saga of the COSMAC MS2000… I powered it up a few days ago. The ROM boots, nothing smoked, the drives whirr. However, one of the RAM boards (the lower 32k) seems to have failed with a stuck bit. it outputs the rather humourous message of BAD RAM P00 (where P00 is memory page 00h). po

Re: RCA COSMAC MS2000 MicroDisk Development System

I’ve torn it down this morning and put some pictures on Imgur. https://imgur.com/gallery/xwSvG8A Should be fairly comprehensive. It looks in good condition, with nothing obviously wrong with it. If there’s anything i’ve missed, or that you’d like better pictu

Re: RCA COSMAC MS2000 MicroDisk Development System

On Thu, 7 Apr 2022, Bill Degnan wrote: This one is from 1975 just before the Altair 8800 https://www.vintagecomputer.net/rca/COSMAC/EDN_COSMAC_Microkit.jpg Ah, ok. Thanks for the pic! ...but I bet yours is more like 1976-77. What is the CPU type 1802 or something else? It's an 1802. It's

Re: RCA COSMAC MS2000 MicroDisk Development System

-- Original Message -- From: "geneb" https://i.imgur.com/Q96sRhE.jpg Nice find! g. No, it looks like this: https://imgur.com/gallery/bHYFoBV -- Original Message -- From: "David Schultz" You didn't mention my web page: http://davesrocketwo

Re: RCA COSMAC MS2000 MicroDisk Development System

From: "Bill Degnan via cctech" ...but I bet yours is more like 1976-77. What is the CPU type 1802 or something else? It's definitely an 1802 family CPU, not sure of exact model, but i'll find that out later when i tear it down (and document/post it here). However, it's much newer than '77.

Re: RCA COSMAC MS2000 MicroDisk Development System

This one is from 1975 just before the Altair 8800 https://www.vintagecomputer.net/rca/COSMAC/EDN_COSMAC_Microkit.jpg ...but I bet yours is more like 1976-77. What is the CPU type 1802 or something else? BIll On Thu, Apr 7, 2022 at 5:54 PM geneb via cctalk wrote: > > On Thu, 7 Apr 2022, Joshua

Re: RCA COSMAC MS2000 MicroDisk Development System

On Thu, 7 Apr 2022, Joshua Rice via cctalk wrote: Hi all, I’ve recently come across something i’ve soon realised really quite unusual. An RCA MS2000 MicroDisk Development System. Does it look like this? https://i.imgur.com/Q96sRhE.jpg Nice find! g. -- Proud owner of F-15C 80-0007 http://

Re: RCA COSMAC MS2000 MicroDisk Development System

> On 04/07/2022 2:50 PM Joshua Rice via cctalk wrote: > > > Hi all, > > I’ve recently come across something i’ve soon realised really quite unusual. > An RCA MS2000 MicroDisk Development System. > > I’m very green to the COSMAC scene, with this being my first 1802 machine. > I’m very inte

RCA COSMAC MS2000 MicroDisk Development System

Hi all, I’ve recently come across something i’ve soon realised really quite unusual. An RCA MS2000 MicroDisk Development System. I’m very green to the COSMAC scene, with this being my first 1802 machine. I’m very interested in knowing the pitfalls i may come across in restoring such a machi