Search found 101 matches
- 21 Nov 2023, 21:41
- Forum: Hardware and software hacking
- Topic: Emulating other CPUs
- Replies: 0
- Views: 5286
Emulating other CPUs
Hi All, This a topic that has been simmering on the back-burner, ever since Marcel astounded us all with the v6502 and the Apple and Microchess emulation. As a Z80 enthusiast, it would be great to emulate the Z80, but for it's day, the Z80 is a surprisingly complex cpu, with 158 instruction "ty...
- 04 Nov 2023, 13:59
- Forum: Escape Meta Alt Control Shift
- Topic: 16-bit Gigatron similar machine
- Replies: 2
- Views: 3421
Re: 16-bit Gigatron similar machine
Personally, I feel that the Gigatron achieves all that was ever intended of it, plus a lot more. It should provide the inspirational basis for new architectures, possibly with different end goals, and these priorities may be varied, depending on the application. I would like to see a hardware "...
- 01 Nov 2023, 16:51
- Forum: Hardware and software hacking
- Topic: Bit Serial Revisited.
- Replies: 1
- Views: 1834
Bit Serial Revisited.
Until about 1952 all computers used a bit-serial architecture in order to reduce the complexity of the hardware. This philosophy continued into the 1970s, so that desktop and handheld electronic calculators could be made economically. The RCA1802 uses a bit serial ALU, to keep the transistor count d...
- 01 Nov 2023, 15:43
- Forum: Hardware and software hacking
- Topic: 10MHz, 12.5MHz and Beyond!
- Replies: 45
- Views: 60796
Re: 10MHz, 12.5MHz and Beyond!
Good Work, Hans.
- 01 Nov 2023, 15:23
- Forum: Kit assembly gallery
- Topic: Another Gigatron TTL in Finland
- Replies: 15
- Views: 14531
Re: Another Gigatron TTL in Finland
Good Work! I like the purple PCB. With a bit of work a Gigatron can be pushed to 10MHz clock, or 12.5MHz with swapping some of the ICs for 74F (fast) series). Whilst I personally have little need for low resolution colour graphics and sound,the Gigatron is a remarkably versatile and fast CPU, capabl...
- 02 May 2022, 20:18
- Forum: Hardware and software hacking
- Topic: High Noon - Gigatron versus Z80 shoot out.
- Replies: 0
- Views: 8131
High Noon - Gigatron versus Z80 shoot out.
The greatest advantage that the Gigatron has over any other 8-bit microprocessor is that all of it's native assembler instructions execute in a single clock cycle. I am currently exploring the Gigatron assembly language, and since I have had experience in Z80 machine code, I thought I would configur...
- 02 May 2022, 19:39
- Forum: Hardware and software hacking
- Topic: Lies, Damned Lies and Benchmarks.
- Replies: 27
- Views: 6969
Re: Lies, Damned Lies and Benchmarks.
What would have been the price of Gigatron in the 70s? ICs were not as cheap, especially SRAM. Still a good deal compared to a Cray1... I have found various magazine adverts in online archives for TTL ICs from the 1970s. Almost all of the TTL ICs used in the Gigatron were available by 1975. Typical...
- 29 Apr 2022, 14:59
- Forum: Hardware and software hacking
- Topic: ROMv5a - Intel hex file required
- Replies: 0
- Views: 8186
ROMv5a - Intel hex file required
EDIT - problem solved. :D I found an online utility that took the binary file and spat it out in the correct Intel hex format :100000000000188018C0C17C0001D60100FF690003 :10001000CA00C2006900EC0B00FF6900CA00610061 :10002000F0140101FC05820000FFC200EC16A001E3 :100030000100EC15A0010001188018C00000D218C...
- 07 Apr 2022, 10:39
- Forum: Hardware and software hacking
- Topic: Gigatron Assembly Language
- Replies: 3
- Views: 2090
Re: Gigatron Assembly Language
Thankyou for your excellent explanation.
I could not understand exactly what the AND / OR instructions were doing.
I was trying to work out how the carry was detected from Cout, not realising that it could be determined from the sign bit of the two operands.
This makes it clear now.
Thanks
I could not understand exactly what the AND / OR instructions were doing.
I was trying to work out how the carry was detected from Cout, not realising that it could be determined from the sign bit of the two operands.
This makes it clear now.
Thanks
- 06 Apr 2022, 16:32
- Forum: Hardware and software hacking
- Topic: Gigatron Assembly Language
- Replies: 3
- Views: 2090
Gigatron Assembly Language
It's unlikely that most Gigatron owners get involved with the native 8-bit assembly language - because it is very much wrapped up in the ROM. However, I have been working on a hardware simulation, using H. Neemann's "Digital" simulator, and I am now working at the native assembly level. I ...