Re: : Re: MSI 6800 EPROM Software
On 2021-Feb-23, at 1:45 PM, Frank Tuccio via cctech wrote: > On 02/22/2021 01:31 PM, Brad H via cctalk wrote: >> >> A longshot I'm sure - but I am wondering if anyone familiar with MSI > (Midwest Scentific - SS50 bus system) would happen to have a copy of the > software for their 1702A EPROM burner, I think the model is PR-1. I just > picked one up and am eager to see if I can use it to read/burn 1702As, > something that has been an issue for me for a while now. >> >> > Reading them is pretty easy. BURNING them is crazy. They > need an 80 V power supply, and I think you XOR the address > or something as you apply the programming voltage. > > Jon > > Actually, programming a 1702 only requires a -48 volt pulse for each > address. Here's the datasheet: > https://www.jmargolin.com/patents/1702a.pdf Ya, but that's with a Vbb of +12V, so the differential required from the power supplies is 60V. (Per the datasheet, it was ~ 55V in the 1702 programmer I once had.) But that's the easy part. And the semi-complex timing and switched-complementing of the address can be done in software. The hassle is that the data lines, address lines and several of the supply and control lines all have to be switched independently with these high voltages. So it's a small mess of specialised discrete drivers and hardware. It's not just pulse a high voltage to one PGM pin like it was for 2716s and later eproms. I don't know what the 2708 (after the 1702, before the 2716) requirements were.
RE: : Re: MSI 6800 EPROM Software
Message: 5 Date: Mon, 22 Feb 2021 21:45:24 -0600 From: Jon Elson To: Brad H , gene...@ezwind.net, discuss...@ezwind.net:On-Topic and Off-Topic Posts Subject: Re: MSI 6800 EPROM Software Message-ID: <60347a54.5070...@pico-systems.com> Content-Type: text/plain; charset=UTF-8; format=flowed On 02/22/2021 01:31 PM, Brad H via cctalk wrote: > Hi there, > > A longshot I'm sure - but I am wondering if anyone familiar with MSI (Midwest Scentific - SS50 bus system) would happen to have a copy of the software for their 1702A EPROM burner, I think the model is PR-1. I just picked one up and am eager to see if I can use it to read/burn 1702As, something that has been an issue for me for a while now. > > Reading them is pretty easy. BURNING them is crazy. They need an 80 V power supply, and I think you XOR the address or something as you apply the programming voltage. Jon Actually, programming a 1702 only requires a -48 volt pulse for each address. Here's the datasheet: https://www.jmargolin.com/patents/1702a.pdf
Re: MSI 6800 EPROM Software
On 02/22/2021 01:31 PM, Brad H via cctalk wrote: Hi there, A longshot I'm sure - but I am wondering if anyone familiar with MSI (Midwest Scentific - SS50 bus system) would happen to have a copy of the software for their 1702A EPROM burner, I think the model is PR-1. I just picked one up and am eager to see if I can use it to read/burn 1702As, something that has been an issue for me for a while now. Reading them is pretty easy. BURNING them is crazy. They need an 80 V power supply, and I think you XOR the address or something as you apply the programming voltage. Jon
MSI 6800 EPROM Software
Hi there, A longshot I'm sure - but I am wondering if anyone familiar with MSI (Midwest Scentific - SS50 bus system) would happen to have a copy of the software for their 1702A EPROM burner, I think the model is PR-1. I just picked one up and am eager to see if I can use it to read/burn 1702As, something that has been an issue for me for a while now. Many thanks, Brad
RE: MSI 6800
Thanks Kip! I did manage to get it going. Turned out the switches for baud rate are not labelled accurately. It has a monitor called Weebug.. no idea how to operate it. :) Hoping it's similar to SWTBUG, MIKBUG etc. Brad Sent from my Samsung device Original message From: Kip Koon <computer...@sc.rr.com> Date: 2016-05-21 4:29 AM (GMT-08:00) To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk@classiccmp.org> Subject: RE: MSI 6800 Hi Brad, I found these two links. I hope they help. < http://www.old-computers.com/museum/computer.asp?st=1=732> < http://www.hinkles.us/chuckbo/MSI-6800/index.htm> Take care my friend. Kip Koon computer...@sc.rr.com http://www.cocopedia.com/wiki/index.php/Kip_Koon > -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Brad H > Sent: Friday, May 20, 2016 10:31 AM > To: General Discussion: On-Topic and Off-Topic Posts > Subject: MSI 6800 > > > > Hi there, > I have acquired an MSI 6800 (SS50) computer and am trying to figure out how > to get it going. I am reaching out everywhere hoping to > find someone with knowledge of these as I have searched around extensively > and cannot find a manual. > With a null modem cable connected to a PC I can get a response from the > computer by typing things or resetting it, but the output is > garbled. I know the baud rate but at present have no way to determine the > other settings like bit, parity, etc. > Any help/advice would be appreciated! > Brad > Sent from my Samsung device
RE: MSI 6800
Hi Brad, I found these two links. I hope they help. < http://www.old-computers.com/museum/computer.asp?st=1=732> < http://www.hinkles.us/chuckbo/MSI-6800/index.htm> Take care my friend. Kip Koon computer...@sc.rr.com http://www.cocopedia.com/wiki/index.php/Kip_Koon > -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Brad H > Sent: Friday, May 20, 2016 10:31 AM > To: General Discussion: On-Topic and Off-Topic Posts > Subject: MSI 6800 > > > > Hi there, > I have acquired an MSI 6800 (SS50) computer and am trying to figure out how > to get it going. I am reaching out everywhere hoping to > find someone with knowledge of these as I have searched around extensively > and cannot find a manual. > With a null modem cable connected to a PC I can get a response from the > computer by typing things or resetting it, but the output is > garbled. I know the baud rate but at present have no way to determine the > other settings like bit, parity, etc. > Any help/advice would be appreciated! > Brad > Sent from my Samsung device
MSI 6800
Hi there, I have acquired an MSI 6800 (SS50) computer and am trying to figure out how to get it going. I am reaching out everywhere hoping to find someone with knowledge of these as I have searched around extensively and cannot find a manual. With a null modem cable connected to a PC I can get a response from the computer by typing things or resetting it, but the output is garbled. I know the baud rate but at present have no way to determine the other settings like bit, parity, etc. Any help/advice would be appreciated! Brad Sent from my Samsung device
MSI 6800
Hi there, I recently acquired a Midwest Scientific Instruments 6800 computer. Been meaning to set it up but was working on restoring a couple of SWTPC terminals first. It has a SI-1 serial board in it and what looks like a second serial board absent manufacturer markings. The SI-1 has configurable baud rate, but I do not know what the other settings should be (ie. 7 or 8 bit, how many stop bits, etc.). I'm working with a PC terminal for now, and the MSI does react to keys being pressed, but it just produces jibberish. I have the baud rate at 1200 and have tried 7 bits, 1 stop bit, Even parity, odd parity, 2 stop bits, 8 bits, etc.. but no avail. Wondering if there's a manual extant out there or anyone with really good memory on how to get these things communicating. Thanks!! Brad
