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- 9-Jan-82 19:18:06-PST,1320;000000000001
- Date: 9 Jan 1982 1918-PST
- From: SCHIFFMAN
- Subject: Upgrading a Z-19 to a H-89
- To: info-micro at MIT-MC
- cc: schiffman
-
- A few questions to those of you who know about the Zenith/Heath
- machine (please reply to Schiffman@SRI-KL):
-
- I have a friend who has a Z-19 and would like to transform it into a
- CP/M runnable system.
-
- 1) Is the Heathkit upgrade package for the H-19 (to convert it
- to the H-89) equally applicable to the Z-19? (I'm pretty sure
- that the Z-19 and the H-19A differ only in the nameplate).
-
- 2) What does that package consist of? Is it only a handfull
- of parts or does it include new circuit boards?
-
- 3) With that upgrade kit, you get 16K of RAM. To get more RAM
- can you just plug in more chips, or do you need new circuit
- boards from Heath?
-
- 4) Given that you buy the Heath diskette controller, can you
- then get the floppies elsewhere (namely are the Heath floppy
- drives vanilla or are they somehow special)?
-
- Another way to phrase these questions is -- seeing I'm handy with
- digital electronics and microprocessors, how can I help my friend
- upgrade his Z-19 for the minimum amount of cash?
-
- Pointers to documentation will be appreciated. (I've already guessed
- that buying the upgrade kit manual from Heath for $5 would be a good
- start).
-
- -Allan
- -------
- 9-Jan-82 20:34:24-PST,712;000000000001
- Mail-from: ARPAnet host MIT-AI rcvd at 9-Jan-82 2034-PST
- Date: 9 Jan 1982 2325-EST
- From: James J. Dempsey <JJD at MIT-EECS at MIT-AI>
- Reply-to: JJD at MIT-MC
- Subject: Re: Upgrading a Z-19 to a H-89
- To: SCHIFFMAN at SRI-KL
- In-Reply-To: Your message of 9-Jan-82 2227-EST
-
- My h89 contains three major circuit boards:
- 1. Video controller board (analog)
- 2. Terminal logic board
- 3. Cpu board
-
- The H19/Z19 (they are the same) contain 1 and 2. I believe
- the major component of the upgrade kit is the cpu
- board. The cpu board contains sockets for upt to 48K ram
- (4116s). FOr 64K you have to buy an upgrade board.
- Feel free to ask any more questions, I'll try to answer them.
-
- --Jim--
- -------
-
- 10-Jan-82 22:05:34-PST,1396;000000000001
- Mail-from: ARPAnet host RUTGERS rcvd at 10-Jan-82 2205-PST
- Date: 11 Jan 1982 0058-EST
- From: COHEN at RUTGERS
- Subject: z-19 upgrade
- To: schiffman at SRI-KL
-
- I am not sure if the Heath upgrade kit can be used on the Z-19, but I
- can give you some idea of the process, as I converted my H-19 a few months
- ago.
- First, the upgrade kit consists of a new power supply and a cpu
- board. The power supply that comes with the H-19 is almost completely
- removed. The cpu board has RAM slots for 48K of memory, but you can piggy
- back another 16K on top of 1 set of 16K. The standard single side, single
- density drive that they use is the Siemens FDD-100-5, and there are many
- places that sell it for less than Heath. Another expense that is probably
- recommended is the 3 port SIO board. The terminal part of the H-89 talks
- to the computer board through the terminals UART (at up to 19.2Kb) so once
- installed, you will need some way to communicate with the outside world.
- You should also check whether you have the proper proms for running CPM.
- If you want, I can give you the Heath part numbers for the new proms so that
- you can check. One thing that you might be interested in, the new power
- supply can power two 51/4 floppies with no problem, which is useful if
- you want to expand for the cost of a drive.
- If you have any other questions, get in touch.
- Howard Cohen
- -------
- 10-Jan-82 22:32:47-PST,365;000000000001
- Date: 10 Jan 1982 2232-PST
- From: SCHIFFMAN
- Subject: Thanks for your replies...
- To: jjd at MIT-MC, cohen at RUTGERS
- cc: schiffman
-
- All replies to my query are being archived in
- <SCHIFFMAN>Z19-TO-H89.MAIL
- which should be FTP'able from SRI-KL with account ANONYMOUS, password GUEST.
-
- Does anyone sell the upgrade kit cheaper than Heath?
-
- -Allan
- -------
- 11-Jan-82 05:26:19-PST,361;000000000001
- Mail-from: ARPAnet host MIT-AI rcvd at 11-Jan-82 0526-PST
- Date: 11 Jan 1982 0822-EST
- From: James J. Dempsey <JJD at MIT-EECS at MIT-AI>
- Reply-to: JJD at MIT-MC
- Subject: Re: Thanks for your replies...
- To: SCHIFFMAN at SRI-KL
- In-Reply-To: Your message of 11-Jan-82 0457-EST
-
- I don't think anyone sells the upgrade kit except heath.
- --Jim--
- -------
-
- 14-Jan-82 05:49:04-PST,3622;000000000001
- Mail-from: ARPAnet host BBN-UNIX rcvd at 14-Jan-82 0548-PST
- Date: 14 Jan 1982 8:43:37 EST (Thursday)
- From: John Swain <jswain at BBN-UNIX>
- Subject: Reply to your message
- To: schiffman@sri-kl
-
- Date: 9 Jan 1982 1918-PST
- From: SCHIFFMAN at SRI-KL
- Subject: Upgrading a Z-19 to a H-89
- To: info-micro at MIT-MC
- cc: schiffman at SRI-KL
-
- A few questions to those of you who know about the Zenith/Heath
- machine (please reply to Schiffman@SRI-KL):
-
- I have a friend who has a Z-19 and would like to transform it into a
- CP/M runnable system.
-
- 1) Is the Heathkit upgrade package for the H-19 (to convert it
- to the H-89) equally applicable to the Z-19? (I'm pretty sure
- that the Z-19 and the H-19A differ only in the nameplate).
-
- -------
- The Z-19 and H-19 differ in only that one was built in Michigan
- and the other is a kit. The (A) suffix means that it is an
- upgrade, and also has a bunch of rf mods in it. It is still
- functionally the same and can be upgraded with the old kit,
- but heath will say you have to wait.
- -------
-
- 2) What does that package consist of? Is it only a handfull
- of parts or does it include new circuit boards?
- --------
- The package consists of a standard H-88 pc board (CPU), power
- supply upgrade and fan. All additional hardware to mount the
- and all wiring to make it work. Also included is the manuals
- that will be needed.
- -------
-
- 3) With that upgrade kit, you get 16K of RAM. To get more RAM
- can you just plug in more chips, or do you need new circuit
- boards from Heath?
- --------
- To go up to 48K, all you have to do is plug in more ram, and then
- change jumpers on the cpu card. To go up to 64K, you will have to
- get an addition PC board from Heath, or else-where, and the
- prom set. The newer kits, however, already have the proms
- in them to allow up to 64K.
- --------
-
- 4) Given that you buy the Heath diskette controller, can you
- then get the floppies elsewhere (namely are the Heath floppy
- drives vanilla or are they somehow special)?
- --------
- They are as vanilla as can be. The only thing about the drives
- that Heath uses, is that they have a 30 ms. step rate, which
- is slow as hell. The hard sectored controller will support
- double sided drives, although Heath doesn't support it. There
- is a device driver from HUG which supports double sided drives
- on the controller. It will also support high track densitys if
- you use the HUG device driver. If he is running CP/M, then the
- BIOS code will have to be modified.
- --------
-
-
- Another way to phrase these questions is -- seeing I'm handy with
- digital electronics and microprocessors, how can I help my friend
- upgrade his Z-19 for the minimum amount of cash?
- ---------
- To give you and idea of what Heath does when you buy a
- H89, they will send you 4 to 5 boxes of kits.
- 1 - H19 terminal kit
- 1 - box containing the CRT tube of your choice
- 1 - H88-1 upgrade kit
- 1 - H88-17 Disk controller kit
- 1 - Floppy disk drive
- and if you bye the total kit (H89) now they also include
- 2 - Ram upgrade kits (Total of 48k)
- 1 - H88-3 Serial I/O controller
- 1 - Rom upgrade kit to allow 64k
-
- As you can see, they just package a h19 with an upgrade
- kit to make the H89. Good luck. I just finished building
- one of these about 6 mo. ago. Works well. If you have any
- more questions, give me a shout.
- --------
-
- Pointers to documentation will be appreciated. (I've already guessed
- that buying the upgrade kit manual from Heath for $5 would be a good
- start).
-
- -Allan
- -------
- John Swain (jswain at BBN-UNIX)
-
-
-
- 3-Feb-82 00:32:32-PST,423;000000000011
- Mail-from: ARPAnet host MIT-MC rcvd at 3-Feb-82 0032-PST
- Date: 3 February 1982 03:32-EST
- From: Keith B. Petersen <W8SDZ at MIT-MC>
- Subject: Upgrading a Z-19 to a H-89
- To: SCHIFFMAN at SRI-KL
-
- I have forwaded your message to INFO-CPM. INFO-MICRO seems to be
- rather inactive right now (they are looking for a new moderator). Are
- you on the INFO-CPM mailing list? If not, send a request to
- INFO-CPM-REQUEST.
-
-
-