Re: [sebhc] Digest for sebhc@googlegroups.com - 10 updates in 2 topics

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John Crane

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May 13, 2025, 8:24:40 PM5/13/25
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The only speed limit to Xmodem is your hardware. There is no arbitrary 2400 baud limit.

XMODEM.ASM source in 8080 is out there. 

Just configure for your needs.

Absolutely no need to use a Raspberry Pi for this.

Unless you just want to make it more fun :)


-J



On 5/13/25 4:52 PM, se...@googlegroups.com wrote:
Eric Mack <Eric...@fasteratwork.com>: May 13 04:16AM

Hello, I have recently, with Norberto's help, set up my H8. Now, I need to refresh myself on the options to share files between H8 and PC.
 
I spent some time on the SEBHC site and I can see a number of partial solutions that people are using with varying degrees of success.
 
The most elegant solution I can think of would be to create a dial-up ISP on a Raspberry PI and call into it at 2400 baud, but that's outside of my current expertise.
 
I would like to know what is current and any tips/advice you can offer. I don't mind reading so feel free to direct me to SEBHC posts, etc.
 
Norberto wrote me a note: "For transferring files there is a Modem program that you can use with the H8-4 card. Send email to the SEBH as Joe created such images to get the details on how to setup the system" so Joe, if you see this, I am interested.
 
Thank you in advance,
 
Eric Mack
smb...@gmail.com <smb...@gmail.com>: May 12 09:56PM -0700

My two favorites are:
 
1. Glenn's vinculum VDIP1 tool set -- lets you copy files to/from a USB
thumb drive
 
2. My own "pinculum" (VDIP1 emulated on a Raspbarry Pi) board. lets you
copy to/from a raspberry pi, which you can in turn NFS-mount or SMB-mount
onto your PC. It's somewhat of a bespoke design that so far as I know,
nobody but me has used, and my documentation is mediocre.
 
I believe some folks here have also implemented a network device, though I
myself have not built one of these yet.
 
Transferring things with via xmodem or kermit or similar file transfer
program has a nice 80s vibe to it, but it's also find it's kind of a pain
to do, and 2400 baud is slow.
 
Scott
 
On Monday, 12 May 2025 at 21:16:27 UTC-7 eric.mack wrote:
 
<glenn.f...@gmail.com>: May 13 02:03PM -0400

IMHO USB transfer is the way to go. We have developed a capability based on the FTDI “VDIP <https://ftdichip.com/products/vdip1/> ” module that lets you copy files to/from any USB flash drive. These are then plainly readable/writable on any PC. Norberto has included this capability in a number of his boards. Here’s a writeup I did a while back on this:
 

 
REMarks Issue 6 - 14 February 2022.pdf <https://sebhc.github.io/sebhc/REMarks/REMarks%20Issue%206%20%20-%2014%20February%202022.pdf>
 

 
You will still need some kind of modem transfer ability but only the first time (to transfer the VDIP software). The software lives here: GitHub - sebhc/vdip-utilities: Utility programs for use with the FTDI VDIP1 <https://github.com/sebhc/vdip-utilities>
 

 
Happy to help further if need be…
 
* Glenn
 

 

 
From: 'Eric Mack' via SEBHC <se...@googlegroups.com>
Sent: Tuesday, May 13, 2025 12:16 AM
To: Se...@GoogleGroups.com
Subject: [sebhc] Looking for solution to transfer files between H8 and PC
 

 
Hello, I have recently, with Norberto’s help, set up my H8. Now, I need to refresh myself on the options to share files between H8 and PC.
 

 
I spent some time on the SEBHC site and I can see a number of partial solutions that people are using with varying degrees of success.
 

 
The most elegant solution I can think of would be to create a dial-up ISP on a Raspberry PI and call into it at 2400 baud, but that’s outside of my current expertise.
 

 
I would like to know what is current and any tips/advice you can offer. I don’t mind reading so feel free to direct me to SEBHC posts, etc.
 

 
Norberto wrote me a note: “For transferring files there is a Modem program that you can use with the H8-4 card. Send email to the SEBH as Joe created such images to get the details on how to setup the system” so Joe, if you see this, I am interested.
 

 
Thank you in advance,
 

 
Eric Mack
 
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Joseph Travis <jtravi...@gmail.com>: May 13 02:06PM -0400

This subject was touched upon in a thread last week but I'm too lazy to go
find it. You didn't provide us with any H/W configuration info so I'm not
sure of what type of files you hope to transfer from a PC to your H8. If
they are floppy disk based files, the VDIP1 solutions mentioned by Scott
are the best method although there is also the H8D Utility program which
utilizes the serial port for file transfer.
 
I believe what Norberto may have been referring to is a simple mod that I
implemented to the H8-5 Serial I/O board which allows you to download /
upload tape based programs between the H8 and a PC reliably at speeds up to
9600 baud. The recommended program to use on the PC for this is RealTerm.
Here is some info and photos for it:
 
H8-5 USB - Serial I/O Mod
 
NOTE: Ensure the FTDI solder pads (on bottom) are set to 5V (NOT 3.3V)
 
1. Use clear RTV silicone to attach the FTDI board to the 8251 USART
2. Bend out the following pins on the 8251: 3, 19, 23, 25
3. Connect a wire between TxC (9) and RxC (25) on the 8251
4. Insert a 6 pin header into the FTDI board
5. Make the following connections between the FTDI board header and 8251:
 
FTDI <---> 8251
GND <---> GND (4)
CTS <---> RTS (23)
Vcc <---> N/C
TXO <---> RxD (3)
RXI <---> TxD (19)
DTR <---> N/C
 
NOTE: Using an 8251A USART will require you to bend out pin 17 (CTS) and
connect it to pin 4 (GND). This modification is required due to internal
differences between the 8251 vs. 8251A and the way the USART is being used
to control the tape recorder. Without this modification, the H8-5 will be
unable to DUMP program(s) / data to tape or PC.
 
Joe
 
norberto.collado koyado.com <norberto...@koyado.com>: May 13 06:34PM

Joe,
 
Attached is a picture of his system. He will need to use the H8-4 serial port to connect to the PC serial port and use the modem program for file transfers.
 
Thanks,
Norberto
 
 
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Joseph Travis <jtravi...@gmail.com>
Date: Tuesday, May 13, 2025 at 11:07 AM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: Re: [sebhc] Re: Looking for solution to transfer files between H8 and PC
This subject was touched upon in a thread last week but I'm too lazy to go find it. You didn't provide us with any H/W configuration info so I'm not sure of what type of files you hope to transfer from a PC to your H8. If they are floppy disk based files, the VDIP1 solutions mentioned by Scott are the best method although there is also the H8D Utility program which utilizes the serial port for file transfer.
 
I believe what Norberto may have been referring to is a simple mod that I implemented to the H8-5 Serial I/O board which allows you to download / upload tape based programs between the H8 and a PC reliably at speeds up to 9600 baud. The recommended program to use on the PC for this is RealTerm. Here is some info and photos for it:
 
H8-5 USB - Serial I/O Mod
 
NOTE: Ensure the FTDI solder pads (on bottom) are set to 5V (NOT 3.3V)
 
1. Use clear RTV silicone to attach the FTDI board to the 8251 USART
2. Bend out the following pins on the 8251: 3, 19, 23, 25
3. Connect a wire between TxC (9) and RxC (25) on the 8251
4. Insert a 6 pin header into the FTDI board
5. Make the following connections between the FTDI board header and 8251:
 
FTDI <---> 8251
GND <---> GND (4)
CTS <---> RTS (23)
Vcc <---> N/C
TXO <---> RxD (3)
RXI <---> TxD (19)
DTR <---> N/C
 
NOTE: Using an 8251A USART will require you to bend out pin 17 (CTS) and
connect it to pin 4 (GND). This modification is required due to internal
differences between the 8251 vs. 8251A and the way the USART is being used
to control the tape recorder. Without this modification, the H8-5 will be
unable to DUMP program(s) / data to tape or PC.
 
Joe
 
On Tue, May 13, 2025 at 12:56 AM smb...@gmail.com<mailto:smb...@gmail.com> <smb...@gmail.com<mailto:smbaker@gmail.com>> wrote:
My two favorites are:
 
1. Glenn's vinculum VDIP1 tool set -- lets you copy files to/from a USB thumb drive
 
2. My own "pinculum" (VDIP1 emulated on a Raspbarry Pi) board. lets you copy to/from a raspberry pi, which you can in turn NFS-mount or SMB-mount onto your PC. It's somewhat of a bespoke design that so far as I know, nobody but me has used, and my documentation is mediocre.
 
I believe some folks here have also implemented a network device, though I myself have not built one of these yet.
 
Transferring things with via xmodem or kermit or similar file transfer program has a nice 80s vibe to it, but it's also find it's kind of a pain to do, and 2400 baud is slow.
 
Scott
On Monday, 12 May 2025 at 21:16:27 UTC-7 eric.mack wrote:
Hello, I have recently, with Norberto’s help, set up my H8. Now, I need to refresh myself on the options to share files between H8 and PC.
 
I spent some time on the SEBHC site and I can see a number of partial solutions that people are using with varying degrees of success.
 
The most elegant solution I can think of would be to create a dial-up ISP on a Raspberry PI and call into it at 2400 baud, but that’s outside of my current expertise.
 
I would like to know what is current and any tips/advice you can offer. I don’t mind reading so feel free to direct me to SEBHC posts, etc.
 
Norberto wrote me a note: “For transferring files there is a Modem program that you can use with the H8-4 card. Send email to the SEBH as Joe created such images to get the details on how to setup the system” so Joe, if you see this, I am interested.
 
Thank you in advance,
 
Eric Mack
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Joseph Travis <jtravi...@gmail.com>: May 13 02:56PM -0400

In that case, use port 330Q on the H8-4 Serial I/O board interfaced to a PC
serial port (may require a "NULL modem" inserted between the two). Using
TeraTerm on the PC and MAPLE on the H8 you can use XMODEM for file
transfers up to 9600 baud.
 
MAPLE can be found on drive SY0: for HDOS or drive A: for CP/M.
 
Joe
 
 
On Tue, May 13, 2025 at 2:34 PM norberto.collado koyado.com <
norberto.collado koyado.com <norberto...@koyado.com>: May 13 07:07PM

Thanks Joe!👍
 
Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Joseph Travis <jtravi...@gmail.com>
Sent: Tuesday, May 13, 2025 11:56:48 AM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: Re: [sebhc] Re: Looking for solution to transfer files between H8 and PC
 
In that case, use port 330Q on the H8-4 Serial I/O board interfaced to a PC serial port (may require a "NULL modem" inserted between the two). Using TeraTerm on the PC and MAPLE on the H8 you can use XMODEM for file transfers up to 9600 baud.
 
MAPLE can be found on drive SY0: for HDOS or drive A: for CP/M.
 
Joe
 
 
On Tue, May 13, 2025 at 2:34 PM norberto.collado koyado.com<http://koyado.com> <norberto...@koyado.com<mailto:norberto.collado@koyado.com>> wrote:
 
Joe,
 
 
 
Attached is a picture of his system. He will need to use the H8-4 serial port to connect to the PC serial port and use the modem program for file transfers.
 
 
 
Thanks,
 
Norberto
 
 
 
 
 
From: se...@googlegroups.com<mailto:sebhc@googlegroups.com> <se...@googlegroups.com<mailto:sebhc@googlegroups.com>> on behalf of Joseph Travis <jtravi...@gmail.com<mailto:jtravis.n6ypc@gmail.com>>
Date: Tuesday, May 13, 2025 at 11:07 AM
To: se...@googlegroups.com<mailto:sebhc@googlegroups.com> <se...@googlegroups.com<mailto:sebhc@googlegroups.com>>
Subject: Re: [sebhc] Re: Looking for solution to transfer files between H8 and PC
 
This subject was touched upon in a thread last week but I'm too lazy to go find it. You didn't provide us with any H/W configuration info so I'm not sure of what type of files you hope to transfer from a PC to your H8. If they are floppy disk based files, the VDIP1 solutions mentioned by Scott are the best method although there is also the H8D Utility program which utilizes the serial port for file transfer.
 
 
 
I believe what Norberto may have been referring to is a simple mod that I implemented to the H8-5 Serial I/O board which allows you to download / upload tape based programs between the H8 and a PC reliably at speeds up to 9600 baud. The recommended program to use on the PC for this is RealTerm. Here is some info and photos for it:
 
 
 
H8-5 USB - Serial I/O Mod
 
NOTE: Ensure the FTDI solder pads (on bottom) are set to 5V (NOT 3.3V)
 
1. Use clear RTV silicone to attach the FTDI board to the 8251 USART
2. Bend out the following pins on the 8251: 3, 19, 23, 25
3. Connect a wire between TxC (9) and RxC (25) on the 8251
4. Insert a 6 pin header into the FTDI board
5. Make the following connections between the FTDI board header and 8251:
 
FTDI <---> 8251
GND <---> GND (4)
CTS <---> RTS (23)
Vcc <---> N/C
TXO <---> RxD (3)
RXI <---> TxD (19)
DTR <---> N/C
 
NOTE: Using an 8251A USART will require you to bend out pin 17 (CTS) and
connect it to pin 4 (GND). This modification is required due to internal
differences between the 8251 vs. 8251A and the way the USART is being used
to control the tape recorder. Without this modification, the H8-5 will be
unable to DUMP program(s) / data to tape or PC.
 
 
 
Joe
 
 
 
On Tue, May 13, 2025 at 12:56 AM smb...@gmail.com<mailto:smb...@gmail.com> <smb...@gmail.com<mailto:smbaker@gmail.com>> wrote:
 
My two favorites are:
 
 
 
1. Glenn's vinculum VDIP1 tool set -- lets you copy files to/from a USB thumb drive
 
 
 
2. My own "pinculum" (VDIP1 emulated on a Raspbarry Pi) board. lets you copy to/from a raspberry pi, which you can in turn NFS-mount or SMB-mount onto your PC. It's somewhat of a bespoke design that so far as I know, nobody but me has used, and my documentation is mediocre.
 
 
 
I believe some folks here have also implemented a network device, though I myself have not built one of these yet.
 
 
 
Transferring things with via xmodem or kermit or similar file transfer program has a nice 80s vibe to it, but it's also find it's kind of a pain to do, and 2400 baud is slow.
 
 
 
Scott
 
On Monday, 12 May 2025 at 21:16:27 UTC-7 eric.mack wrote:
 
Hello, I have recently, with Norberto’s help, set up my H8. Now, I need to refresh myself on the options to share files between H8 and PC.
 
 
 
I spent some time on the SEBHC site and I can see a number of partial solutions that people are using with varying degrees of success.
 
 
 
The most elegant solution I can think of would be to create a dial-up ISP on a Raspberry PI and call into it at 2400 baud, but that’s outside of my current expertise.
 
 
 
I would like to know what is current and any tips/advice you can offer. I don’t mind reading so feel free to direct me to SEBHC posts, etc.
 
 
 
Norberto wrote me a note: “For transferring files there is a Modem program that you can use with the H8-4 card. Send email to the SEBH as Joe created such images to get the details on how to setup the system” so Joe, if you see this, I am interested.
 
 
 
Thank you in advance,
 
 
 
Eric Mack
 
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Eric Mack <Eric...@fasteratwork.com>: May 13 07:44PM

Could a GoTek drive handle the USB Interface on the H8 side? If so, what would I use on the PC side?
 
 
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of glenn.f...@gmail.com
Sent: Tuesday, May 13, 2025 11:04 AM
To: se...@googlegroups.com
Subject: RE: [sebhc] Looking for solution to transfer files between H8 and PC
 
IMHO USB transfer is the way to go. We have developed a capability based on the FTDI “VDIP<https://ftdichip.com/products/vdip1/>” module that lets you copy files to/from any USB flash drive. These are then plainly readable/writable on any PC. Norberto has included this capability in a number of his boards. Here’s a writeup I did a while back on this:
 
REMarks Issue 6 - 14 February 2022.pdf<https://sebhc.github.io/sebhc/REMarks/REMarks%20Issue%206%20%20-%2014%20February%202022.pdf>
 
You will still need some kind of modem transfer ability but only the first time (to transfer the VDIP software). The software lives here: GitHub - sebhc/vdip-utilities: Utility programs for use with the FTDI VDIP1<https://github.com/sebhc/vdip-utilities>
 
Happy to help further if need be…
 
* Glenn
 
 
From: 'Eric Mack' via SEBHC <se...@googlegroups.com<mailto:sebhc@googlegroups.com>>
Sent: Tuesday, May 13, 2025 12:16 AM
To: Se...@GoogleGroups.com<mailto:Sebhc@GoogleGroups.com>
Subject: [sebhc] Looking for solution to transfer files between H8 and PC
 
Hello, I have recently, with Norberto’s help, set up my H8. Now, I need to refresh myself on the options to share files between H8 and PC.
 
I spent some time on the SEBHC site and I can see a number of partial solutions that people are using with varying degrees of success.
 
The most elegant solution I can think of would be to create a dial-up ISP on a Raspberry PI and call into it at 2400 baud, but that’s outside of my current expertise.
 
I would like to know what is current and any tips/advice you can offer. I don’t mind reading so feel free to direct me to SEBHC posts, etc.
 
Norberto wrote me a note: “For transferring files there is a Modem program that you can use with the H8-4 card. Send email to the SEBH as Joe created such images to get the details on how to setup the system” so Joe, if you see this, I am interested.
 
Thank you in advance,
 
Eric Mack
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Joseph Travis <jtravi...@gmail.com>: May 13 04:12PM -0400

No.
 
On Tue, May 13, 2025 at 3:44 PM 'Eric Mack' via SEBHC <
Steven Hirsch <snhi...@gmail.com>: May 11 07:05PM -0400

On 5/9/25 08:51, Les Bird wrote:
> these made by JLC and ordered a bunch of PLC44 Z80 20MHZ chips from AliExpress
> (https://www.aliexpress.us/item/3256804836040322.html).
 
> It's a great alternative for the Z80 DIP if those are getting hard to find.
 
Great minds must think alike. I did the same thing last summer after Zilog
discontinued the DIP Z80.
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John Crane

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May 13, 2025, 8:43:49 PM5/13/25
to se...@googlegroups.com

As a followup - here is the code to initialize the UART in the H8:


;------------------------------------------------
; Initialize 8251 Chip

            MVI     A,4EH   ; 1 stop, no parity, 8 bits, 16x (116 octal)
            OUT     TTS     ;
            MVI     A,5        ; rcv enable, xmit enable (5 octal)
            OUT     TTS     ;
;------------------------------------------------



Lots of talk about USB drives.  While I do have that capability, I find it easier to just transfer directly.

I have a 'serial network' loop setup with all my vintage machines.

With appropriate switch settings from my desktop, I connect one to my main PC, and off I go.

No shuffling  USB sticks around.  :)

Eric Mack

unread,
May 15, 2025, 12:23:23 AM5/15/25
to se...@googlegroups.com

Thank you, John, Glenn, Joe and others. I think I will use the serial port option until I have developed a clearer understanding of the options you have presented.

 

Eric

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